Engine Control Module Scan Tool Information 1.4L,1.5L,1.6L
| Table 1: | Engine Control Module Scan Tool Data |
| Table 2: | Engine Control Module (ECM) Scan Tool Output Controls |
The Engine Control Module Scan Tool Data List contains all engine-related parameters that are available on the scan tool. This is a master list arranged in alphabetical order and not all the parameters listed are in every engine platform.
Use the Engine Scan Tool Data List only after the following is determined:
| • | The Diagnostic System Check - Vehicle is completed. |
| • | No diagnostic trouble codes (DTCs) |
| • | On-board diagnostics are functioning properly |
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.
Important: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis.
Parameter | System State | Expected Value | Description |
|---|---|---|---|
Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop | |||
5 Volt Reference 1or 2 | Ignition ON | 5 Volts | This parameter displays the output voltage from the 5-volt reference circuit to the control module. This parameter only supports one 5-volt reference output from the control module. |
A/C High Side Pressure | A/C OFF | 0-5 Volts | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 0-5 Volts | ||
A/C High Side Pressure | A/C OFF | 450-650 kPa (65-95 psi) | This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 650-800 kPa (95-105 psi) | ||
A/C Relay Command | A/C ON | On | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
A/C Request Signal | A/C ON | Yes | This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. |
Air Flow Calculated | -- | 3-6 g/s | This parameter displays the calculated air flow into the engine that is based on manifold absolute pressure. The calculation is used in several diagnostics to determine when to run the diagnostics. |
Air Fuel Ratio | -- | Ratio 14.7:1 | This parameter displays the air to fuel ratio based on the oxygen sensor inputs. The engine control module (ECM) uses the fuel trims to adjust fueling in order to attempt to maintain an air fuel ratio of 14.7:1. |
APP Indicated Angle | -- | Varies | This parameter displays the angle of the accelerator pedal position (APP) as calculated by the control module using the signals from the APP sensors. |
APP Sensor 1or 2 | -- | Varies | This parameter displays the actual percentage of each APP sensor signal circuit as measured by the control module. |
BARO | -- | 65-104 kPa (8-16 psi) - Varies with altitude | This parameter displays the barometric pressure. The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences. |
Case Diagnostic Learning | -- | Learned | This parameter displays Learned if the control module has completed the CKP System Variation Learn Procedure. |
Catalytic Converter Protection Active | -- | No | This parameter displays if the control module is commanding catalytic converter protection. |
Cmmd. A/F Equivalence Ratio | -- | Ratio 1.0:1 | This parameter displays the air to fuel ratio based on throttle state. The control module changes the ratio for acceleration or deceleration. |
CMP Active Counter | -- | 1-3 Counts | This parameter displays the camshaft position (CMP) active counts. If the control module does not detect a signal from the CMP sensor, the counter will not increment. |
Coolant Hot Lamp | -- | Off | This parameter displays the control modules commanded state of the hot mode lamp. |
Cruise Control Active | Cruise Control ON | Yes | This parameter displays the status of the cruise control system as determined by the control module. |
Cruise Disengage 1-5 History | -- | Varies | This parameter displays the history of the action taking with the cruise system. |
Cruise Lamp Command | Cruise Control ON | Yes | This parameter displays the state of the cruise lamp to the instrument panel (IP) cluster as requested by the control module. |
Cruise ON/OFF Switch | Cruise Control ON | Yes | This parameter displays the state of the ON/OFF switch input to the control module. |
Cruise Resume/Accel. Switch | Cruise Resume/Accel. Switch ON | Active | This parameter displays the state of the Resume/Accel switch input to the control module from the cruise control system. |
Cruise Set/Coast Switch | Cruise Set/Coast Switch ON | Active | This parameter displays the state of the Set/Coast switch input to the control module from the cruise control system. |
Decel Fuel Cut Off | -- | Inactive | This parameter displays the status of the operating mode of the control module used to turn off the fuel injectors during certain deceleration conditions. |
Desired EGR Position | -- | Varies | This parameter displays the desired exhaust gas recirculation (EGR) position as commanded by the control module. |
Desired IAC Position | -- | Counts | This parameter displays the desired idle air control (IAC) position as commanded by the control module. |
Desired Idle Speed | -- | 750-950 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
Distance Since DTC Cleared | -- | Varies | This parameter displays the mileage that has elapsed since the DTC cleared. |
ECT Sensor | -- | -39 to +140°C ( -38 to +284°F) | This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
EGR Flow Test Count | -- | Counts | This parameter displays the number of EGR flow test samples collected during the current ignition cycle. |
EGR Learned Minimum Position | -- | Varies | This parameter displays the exhaust gas recirculation (EGR) valve minimum position in percent of range learned by the control module. |
EGR Learned Minimum | -- | Varies | This parameter displays the learned minimum value of the EGR valve as recorded by the control module during the last learn procedure. |
EGR Position Sensor | -- | Varies | This parameter displays the actual EGR pintle position in percentage. |
EGR Position Sensor | -- | Varies | This parameter displays the actual EGR pintle position in volts. |
EGR Position Variance | -- | Counts | This parameter displays the difference between the actual command of the EGR valve and the desired position of the EGR valve. |
EGR Solenoid Command | -- | Varies | This parameter displays the state of the control circuit for EGR solenoid as commanded by the control module. |
Engine Load | Engine Idling | 25-40% | This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors. |
Engine speed at 2,500 RPM | 25-40% | ||
Engine Run Time | Engine Operating | 0:00:00 Increments when the engine is operating | This parameter displays the time elapsed since the engine was started. |
Engine Speed | Engine Cranking | Greater than 60 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position (CKP) sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors. |
Engine Idling | Approximately 750-950 RPM | ||
EVAP Purge Solenoid Command | -- | 0-100% | This parameter displays the on-time or duty cycle of the EVAP canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge. |
EVAP Vent Solenoid Command | -- | Venting | This parameter displays the state of the EVAP vent solenoid as commanded by the control module. |
Fail Counter | -- | Counts | This parameter displays the number of times a DTC failed |
Fan High Speed Command | Fan High Speed ON | On | This parameter displays the control module commanded state of the fan relay control circuit. |
Fan Low Speed Command | Fan Low Speed ON | On | This parameter displays the control module commanded state of the fan relay control circuit. |
Fuel Level Gage Command | -- | Varies | This parameter displays the control module commanded state of the fuel gage control circuit. |
Fuel Level to Cluster | -- | Varies | This parameter displays the control module commanded state of the fuel gage control circuit. |
Fuel Level Sensor | -- | 0-100% | This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module. |
Fuel Level Sensor | -- | 0-5 Volts | This parameter displays the voltage signal received by the control module from the fuel level sensor. |
Fuel Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2 seconds | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
Engine idling | On | ||
Fuel Tank Pressure Sensor | -- | Varies | This parameter displays the pressure/vacuum inside the fuel tank. A negative value indicates a vacuum, while a positive value indicates a pressure. |
Fuel Tank Pressure Sensor | -- | 0-5 Volts | This parameter displays the voltage signal received by the control module from the fuel tank pressure (FTP) sensor. |
Fuel Trim Cell | -- | Cell Number | This parameter displays what fuel trim cell that is currently active. |
Fuel Trim Learned | -- | Enabled | This parameter displays Enabled when conditions are appropriate for enabling long term fuel trim corrections. This indicates that the long term fuel trim is adapting continuing amounts of short term fuel trim. If the scan tool displays Disabled, then long term fuel trim will not respond to changes in short term fuel trim. |
HO2S 1 or HO2S 2 Heater | -- | Varies | This parameter displays the amperage of the HO2S heater commanded by the control module. |
IAC Position | -- | 15-40 counts | This parameter displays the engine control module (ECM) command for the IAC pintle position in counts. The higher the number of counts, the greater the commanded idle speed reads. The IAC responds to changes in the engine load in order to maintain the desired idle speed. |
IAT Sensor | -- | -39° to +140°C (-38° to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
Ignition 1 Signal | -- | B+ | This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal. |
IMT Valve Command | -- | Off | This parameter displays the commanded state of the IMT valve solenoid by the control module. |
IMT Valve Position Sensor | -- | Varies | This parameter displays the percentage in range based on input to the control module the control module from the IMT valve position sensor. |
Injector PWM Average | -- | 0-9 ms | This parameter displays the average pulse width of the fuel injectors as determined by the control module. |
Knock Retard | -- | Degrees | This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensors. |
KS Active Counter | -- | Counts | This parameters displays the number of times the control module detects activity from the knock sensor. |
Long Term FT | -- | 0-2% | This parameter displays the commanded Long Term Fuel Trim correction by the control module. |
Long Term FT Average | -- | 0% | This parameter displays the commanded Long Term Fuel Trim correction by the control module. |
Loop Status | -- | Closed Loop | This parameter displays the state of the fuel control system as commanded by the control module. Closed Loop operation indicates that the control module is controlling the fuel delivery based off the oxygen sensors input signal. In Open Loop operation the control module ignores the oxygen sensor input signal and bases the amount of fuel to be delivered on other sensor inputs. |
Low Fuel Lamp Command | Low Fuel Lamp Command ON | On | This parameter displays the control modules commanded state of the low fuel lamp. |
MAP Sensor | -- | 32-50 kPa | This parameter displays the pressure from the MAP sensor to the control module |
MAP Sensor | -- | 0-5 Volts | This parameter displays the signal voltage from the MAP sensor to the control module. |
MIL Command | MIL Command ON | On | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the control module. |
Mileage Since First Failure | -- | Varies | This parameter displays the mileage that has elapsed since the first emission failure. |
Mileage Since Last Failure | -- | Varies | This parameter displays the mileage that has elapsed since the last emission failure. |
Misfire Current Cyl. 1-4 | -- | 0-255 Counts | This parameter displays the number of misfires that have been detected during the last 200 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all of the cylinders, and in low numbers. |
Misfire Detects Rough Road | Rough Road Detected | Yes | This parameter displays the detection of a rough road during misfire detection by the control module. |
Misfire History Cyl. 1-4 | -- | 0-255 Counts | The misfire history counters display the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will update every 200 cylinder firing events. |
Not Run Counter | -- | Counts | This parameter displays the number of times a DTC does not run. |
O2S/HO2S 1 or 2 | -- | Varies 400-800 mV | This parameter displays the voltage output from the H/O2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust. |
O2S/HO2S 1 Ready | -- | Yes | This parameter displays that the HO2S 1 is at operating temperature. |
Pass Counter | -- | Counts | This parameter displays the number of times a DTC passed. |
PNP Switch | -- | Park/Neutral | This parameter displays whether the transmission range selector is in park/neutral or in gear. |
Power Enrichment | -- | Inactive | This parameter displays the status of the operating mode of the control module used to increase fuel delivery during certain acceleration conditions. |
Power Steering Pressure Switch | -- | Normal Pressure | This parameter displays the state of the power steering pressure switch. |
Rich/Lean to Lean/Rich Ratio Sensor 1 | -- | Counts | This parameter displays the oxygen sensor rich/lean to lean/rich ratio. The rich/lean average is divided by the lean/rich average in order to determine the oxygen sensor ratio. |
Rich/Lean to Transition Sensor 1 | -- | Counts | This parameter displays the oxygen sensor rich/lean and lean/rich switches. A switch is when the oxygen sensor voltage goes above 450 mV and below 450 mV. |
Reduced Engine Power | -- | No | This parameter displays the status of the operating mode of the control module used to reduce engine power to prevent catalytic converter or engine damage or due to a Throttle Actuator Control (TAC) system failure. |
Rough Road Sensor | -- | 0-5 Volts | This parameter displays the voltage from the rough road sensor. |
Rough Road Signal-ABS | -- | 0-5 Volts | This parameter displays the voltage from the ABS module for the rough road signal. |
Short Term FT Avg. | -- | -3% to +3% | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0. |
Short Term FT | -- | -3% to +3% | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0. |
Spark | -- | -20 to +40Degrees | This parameter displays the amount of spark advance the control module is commanding on the ignition control circuits. The control module determines the desired advance. |
Start Up ECT | -- | -39° to +140°C (-38° to +284°F) | This parameter displays the temperature of the engine coolant on start up based on input to the control module from the ECT sensor. |
Start Up IAT | -- | -39° to +140°C (-38° to +284°F) | This parameter displays the temperature of the intake air at start in the air induction system based on input to the control module from the IAT sensor. |
SVS Lamp Command | SVS Lamp Command ON | On | This parameter displays the control modules commanded state of the service vehicle soon lamp. |
TAC Motor Command | TAC Motor Command ON | Varies | This parameter displays the percentage of the commanded state of the TAC motor by the control module. |
TCC Enable Solenoid Command | TCC Enable Solenoid Command ON | On | This parameter displays the control module commanded state of the TCC solenoid. |
Throttle Plate at Idle | -- | Yes | This parameter displays whether the throttle plate at idle or not as calculated by the control module using information from the throttle position (TP) sensor. The scan tool will display Yes for the throttle plate to be at idle. The scan tool will display No when the throttle plate is opened. |
Total Misfire | -- | Counts | This parameter displays the total number of cylinder firing events that the control module detected as misfires for the last 200 crankshaft revolution sample period. |
TP Angle | -- | Varies | This parameter displays the percent of throttle opening as calculated by the control module using information from the two TP sensors. |
TP Desired Angle | -- | Varies | This parameter displays the desired TP angle commanded by the control module. |
TP Indicated Angle | -- | Varies | This parameter displays the actual TP angle indicated by the control module using information from the two TP sensors. |
TP Sensor | -- | 0.0-0.3 Volts | This parameter displays the actual voltage on the TP sensor signal circuit as measured by the control module. |
TP Sensor | -- | 5-15% | This parameter displays the percent of throttle opening as calculated by the control module using information from the throttle position (TP) sensor. |
TP Sensor 1 or 2 | -- | Varies | This parameter displays the percent of throttle opening as calculated by the control module using information from the throttle position (TP) sensor. |
Transmission Gear Position Signal | -- | Park/Neutral | This parameter displays the position of the transmission gear selector that is transmitted over the serial data circuit from the transmission control module (TCM). |
TWC Temperature Calculated | -- | Varies | This parameter displays the catalytic converter temperature as calculated by the control module. |
Vehicle Security Status | -- | Disabled | This parameter displays the status of the vehicle theft deterrent system. The normal parameter display for the theft deterrent system is Disabled. If a condition exists with the theft deterrent system the parameter will display Enabled and the vehicle will not start. |
Vehicle Speed Sensor | -- | 0 Km/h 0 mph | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor (VSS). |
Warm-ups Since DTC Cleared | -- | Counts | This parameter displays the number of warm-ups since the DTC was cleared. |
Wheel/Vehicle Speed Input | -- | 0 Km/h 0 mph | This parameter displays the speed of the vehicle as calculated by the control module from information received from the vehicle speed sensor (VSS) or wheel speed sensor depending on application. |
Output Control | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
A/C Relay |
Important: The A/C Relay Command parameter may not change states when using this output control. This function activates the A/C compressor relay. The normal commanded state of the A/C relay is None. The A/C compressor will turn ON/OFF when commanded ON/OFF. The system remains in the commanded state until cancelled by the scan tool. This output can also be monitored on the scan tool data parameter A/C Relay Command. The engine control module (ECM) will inhibit the operation of the A/C relay when the ambient air temperature is low. | ||||||||||
Crankshaft Position Variation Learn | This function enables the engine control module (ECM) to learn the variations in the crankshaft position (CKP) system. The ECM will learn the variations once the following conditions are met:
The ECM learns the variation values on the deceleration from fuel cut-off. | ||||||||||
EGR Solenoid |
Important: The EGR Position Sensor parameter may not properly change states when using this output control. This function activates the exhaust gas recirculation (EGR) solenoid that controls EGR valve position. The normal commanded state is None. The system will increase or decrease the amount of EGR opening by 10 percent increments within a range of 0-100 percent. The EGR Position sensor parameter may not change states until commanded to 40 percent. This output can also be monitored on the scan tool data parameter EGR Position Sensor. The system remains in the commanded state until cancelled by the scan tool. If the engine is running, too much EGR will result in a rough idle and/or stalling. | ||||||||||
EVAP Purge Solenoid |
Important:
This function controls the EVAP purge solenoid valve. The normal commanded state is None. The system will increase or decrease the amount of purge by changing the duty cycle of the purge valve in 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the scan. | ||||||||||
EVAP Vent Solenoid |
Important: This function may be disabled if there is an EVAP DTC set. This function controls the EVAP vent solenoid. The normal commanded state is None. When commanded ON, the vent valve switches to Not-venting. When commanded OFF, the vent valve switches to Venting. The system remains in the commanded state unless one of the following conditions occurs:
| ||||||||||
EVAP Purge/Seal | Simultaneously activates the purge solenoid in 10 percent increments from 0 to 100 percent and the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds 19 mm Hg (10 in H2O). | ||||||||||
Fan High Speed | This function operates one engine cooling fan at high speed by enabling the fan high speed relay. The normal commanded state of the relay is None. When commanded ON/OFF, the cooling fan turns ON/OFF. The system remains in the commanded state until cancelled by the scan tool. The ECM allows relay control when the following conditions are met:
| ||||||||||
Fan Low Speed | This function operates one engine cooling fan at high speed by enabling the fan high speed relay. The normal commanded state of the relay is None. When commanded ON/OFF, the cooling fan turns ON/OFF. The system remains in the commanded state until cancelled by the scan tool. The ECM allows relay control when the following conditions are met:
| ||||||||||
Fuel Injector Test |
Important: DTCs may set when using this output control. This function operates the selected fuel injector ON/OFF. The normal commanded state is None. The ECM enables or disables the fuel injector ON/OFF when the test is initiated. The fuel injector remains in the commanded state until cancelled by the scan tool. The scan tool initiates the test when the following conditions are met:
| ||||||||||
Fuel Pump Relay |
Important: DTCs may set when using this output control. This function controls the fuel pump relay. The normal commanded state is None. The scan tool initiates the test when the following conditions are met:
When commanded ON/OFF, the ECM turns the fuel pump relay ON/OFF. If the engine is running and the fuel pump relay is commanded OFF, the engine will stall. This output can also be monitored on the scan tool data parameter Fuel Pump Relay Command. The system remains in the commanded state until cancelled by the scan tool or the ECM detects a vehicle speed. | ||||||||||
Engine Speed | This function controls the idle speed override in 25 RPM, 100 RPM, and 500 RPM increments, from the base idle speed to 1,400 RPM. The scan tool initiates the test when the following conditions are met:
The engine speed will remain in the commanded state until cancelled by the scan tool. | ||||||||||
IAC Motor Position | This function activates the idle air control (IAC) valve to change engine speed. The normal commanded state is None. The system will increase or decrease the amount of IAC opening by 5 percent increments within a range of 500-4,000 RPM. This output can also be monitored on the scan tool data parameter IAC Position. The system remains in the commanded state until cancelled by the tool. | ||||||||||
IAC Reset | This function resets the IAC valve position and the learned values for the IAC system in the ECM. | ||||||||||
IMT Valve | This function controls the intake manifold tuning (IMT) valve solenoid. The normal commanded state is None. When commanded ON/OFF, the ECM turns the IMT valve solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. | ||||||||||
Malfunction Indicator Lamp |
Important: The MIL Command parameter may not change states when using this output control. This function controls the malfunction indicator lamp (MIL). The normal commanded state is None. When commanded ON/OFF, the ECM turns the malfunction indicator lamp (MIL) ON/OFF. This output can also be monitored on the scan tool data parameter MIL Command. The system remains in the commanded state until cancelled by the scan tool. | ||||||||||
Throttle Position | This function controls the throttle valve in 10 percent increments. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. |
Engine Control Module Scan Tool Information 1.2L
| Table 1: | Engine Control Module Scan Tool Data |
| Table 2: | Engine Control Module (ECM) Scan Tool Output Controls |
The Engine Control Module Scan Tool Data List contains all engine-related parameters that are available on the scan tool. This is a master list arranged in alphabetical order and not all the parameters listed are in every engine platform.
Use the Engine Scan Tool Data List only after the following is determined:
| • | The Diagnostic System Check - Vehicle is completed. |
| • | No diagnostic trouble codes (DTCs) |
| • | On-board diagnostics are functioning properly |
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.
Important: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis.
Parameter | System State | Expected Value | Description |
|---|---|---|---|
Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop | |||
A/C Evap. Temperature Sensor | -- | -40° to +130°C (-40° to +266°F) | This parameter displays the temperature of the A/C evaporator core based on the input to the control module from the A/C evaporator temperature sensor signal circuit. |
A/C High Side Pressure | A/C OFF | 0-5 Volts | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 0-5 Volts | ||
A/C High Side Pressure | A/C OFF | 500-2,200 kPa (72-319 psi) | This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module. |
A/C ON | 300-1,200 kPa (43-174 psi) | ||
A/C Relay Command | A/C ON | On | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
A/C Request Signal | A/C ON | Yes | This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. |
BARO | -- | 65-104 kPa (8-16 psi) - Varies with altitude | This parameter displays the barometric pressure. The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences. |
Case Diagnostic Learning | -- | Learned | This parameter displays Learned if the control module has completed the CKP System Variation Learn Procedure. |
CASE Learned Cyl. 1-4 | -- | Counts | This parameter displays the CKP Learn offset in counts between cylinders. |
Desired Idle Speed | -- | 800 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
DTC Set This Ignition | -- | No | This parameter displays Yes if a DTC set on the current ignition cycle. |
ECT Sensor | -- | 0-5 Volts | This parameter displays the voltage of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
ECT Sensor | -- | -40° to +130°C (-40° to +266°F) | This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
EC Ignition Relay Command | Ignition ON | ON | This parameter displays the state of the control circuit for main relay as commanded by the control module. |
EGR Position Sensor | -- | 0.6-0.75 Volts | This parameter displays the actual EGR pintle position in volts. |
EGR Solenoid Command | -- | 0% | This parameter displays the state of the control circuit for EGR solenoid as commanded by the control module. |
Engine Load | Engine Idling | 20-30% | This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors. |
Engine speed at 2,500 RPM | 10-20% | ||
Engine Speed | Engine Cranking | Greater than 60 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position (CKP) sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors. |
Engine Idling | Approximately 650-900 RPM | ||
EVAP Purge Solenoid Command | -- | 0-100% | This parameter displays the on-time or duty cycle of the EVAP canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge. |
Fan High | Fan High Commanded ON | ON | This parameter displays the control module commanded state of the fan relay control circuit. |
Fan Low | Fan Low Commanded ON | ON/OFF | This parameter displays the control module commanded state of the fan relay control circuit. |
Fuel Gage Control | -- | 0-100% | This parameter displays control module commanded state of the fuel gage control circuit. |
Fuel Level | -- | 0-100% | This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module. |
Fuel Level Sensor | -- | 0-5 Volts | This parameter displays the voltage signal received by the control module from the fuel level sensor. |
Fuel Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2 seconds | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
Engine idling | On | ||
HO2S 1 and 2 Heater Command | -- | 0-100% | This parameter displays the commanded state of the heater control circuit as commanded by the control module. |
IAT Sensor | -- | -39° to +140°C (-38° to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
IAT Sensor | -- | 0-5 Volts | This parameter displays the IAT sensor voltage. |
Idle Switch | -- | ON | This parameter displays if the engine is at idle. The parameter will change from ON to OFF when the engine is not at an idle. |
Ignition 1 Signal | -- | B+ | This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal. |
Injector PWM | -- | 0-9 ms | This parameter displays the average pulse width of the fuel injectors as determined by the control module. |
ISC Command | -- | 0-100% | This parameter displays the ECM command for the idle speed control (ISC) motor position in percentage. The higher the number, the greater the commanded idle speed reads. The ISC responds to changes in the engine load in order to maintain the desired idle speed. |
ISC Motor Position Sensor | -- | 0-100% | This parameter displays the ECM command for the idle speed control (ISC) motor position in percentage. The higher the number, the greater the commanded idle speed reads. The ISC responds to changes in the engine load in order to maintain the desired idle speed. |
ISC Motor Position Sensor | -- | 0-5 Volts | This parameter displays the actual position for the ISC motor position in voltage. |
Knock Sensor | -- | 0-5 Volts | This parameters displays the voltage input to the control module from the knock sensor (KS). |
Long Term FT | -- | 0% | This parameter displays the commanded Long Term Fuel Trim correction by the control module. |
Loop Status | -- | Closed Loop | This parameter displays the state of the fuel control system as commanded by the control module. Closed Loop operation indicates that the control module is controlling the fuel delivery based off the oxygen sensors input signal. In Open Loop operation the control module ignores the oxygen sensor input signal and bases the amount of fuel to be delivered on other sensor inputs. |
LT FT Cruise/Accel. | -- | 0% | This parameter displays the commanded Long Term Fuel Trim correction by the control module for cruise and acceleration conditions. |
LT FT Idle/Decel. | -- | 0% | This parameter displays the commanded Long Term Fuel Trim correction by the control module for idle and deceleration conditions. |
MAP Sensor | -- | 32-40 kPa | This parameter displays the pressure from the MAP sensor to the control module. |
MAP Sensor | -- | 0-5 Volts | This parameter displays the signal voltage from the MAP sensor to the control module. |
MIL Command | -- | Off | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the control module. |
O2S/HO2S 1 or 2 | -- | Varies 400-800 mV | This parameter displays the voltage output from the H/O2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust. |
Octane Level | -- | Counts | This parameter displays counts. |
Short Term FT Avg. | -- | -3% to +3% | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0. |
Short Term FT | -- | -3% to +3% | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0. |
Spark | -- | 2-10 Degrees | This parameter displays the amount of spark advance the control module is commanding on the ignition control circuits. The control module determines the desired advance. |
TP Sensor | -- | 4.0-4.5 Volts | This parameter displays the actual voltage on the TP sensor signal circuit as measured by the control module. |
TP Sensor | -- | 3-5% | This parameter displays the percent of throttle opening as calculated by the control module using information from the throttle position (TP) sensor. |
Transmission Gear Position Signal | -- | Park/Neutral | This parameter displays the position of the transmission gear selector that is transmitted over the serial data circuit from the transmission control module (TCM). |
Vehicle Security Status | -- | Disabled | This parameter displays the status of the vehicle theft deterrent system. The normal parameter display for the theft deterrent system is Disabled. If a condition exists with the theft deterrent system the parameter will display Enabled and the vehicle will not start. |
Vehicle Speed Sensor | -- | Km/h mph | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor (VSS). |
Output Control | Description |
|---|---|
A/C Relay |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the A/C compressor relay. When commanded ON, the A/C compressor will cycle ON/OFF for 3-5 seconds. |
EGR Solenoid |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the exhaust gas recirculation (EGR) solenoid. When commanded ON, the EGR solenoid will cycle from 0-100 percent for 3-5 seconds. This output can also be monitored on the scan tool by observing the EGR Position Sensor data parameter. |
Engine Controls Ignition Relay |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the engine control ignition relay or MAIN relay. When commanded ON, the engine control ignition relay will cycle ON/OFF for 3-5 seconds. |
EVAP Purge Solenoid |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the evaporative emission (EVAP) purge solenoid. When commanded ON, the EVAP purge solenoid will cycle ON/OFF for 3-5 seconds. This output can also be monitored on the scan tool by observing the EVAP Purge Solenoid Command data parameter. |
Fan High |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the high speed cooling fan relay. When commanded ON, the cooling fan will turn ON at high speed for 5 seconds. |
Fan Low |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the low speed cooling fan relay. When commanded ON, the cooling fan will turn ON at low speed for 5 seconds. |
Fuel Pump Relay |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the fuel pump relay. When commanded ON, the fuel pump relay will cycle ON/OFF for 3-5 seconds. |
IAC Motor Position |
Important: This function is only allowed with the ignition ON, engine OFF. This function activates the idle air control (IAC) valve to change position. The system will cycle the IAC valve for 3-5 seconds. This output can also be monitored on the scan tool data parameter IAC Position. |
Idle Learn Reset | This function resets the base idle value learned by the engine control module (ECM). |
ISC Actuator |
Important: This function is only allowed with the ignition ON, engine OFF. This function controls the idle speed control (ISC) actuator. The ECM actuates the ISC actuator for 3-5 seconds when commanded ON. This output can also be monitored on the scan tool by observing the TP Sensor data parameter. |
ISC System | This function resets the learned values for the idle speed control (ISC) system in the ECM. |
Malfunction Indicator Lamp | This function controls the malfunction indicator lamp (MIL). When commanded ON with the engine running, the ECM turns the (MIL) ON/OFF for 3-5 seconds. When commanded OFF with the ignition ON, engine OFF, the ECM turns the MIL ON/OFF for 3-5 seconds. |
Reset ECM | This function resets all the values learned by the ECM. |
