Crankshaft Position Variation Learn

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Enables the powertrain 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.

Cylinder 1, Cylinder 4, Cylinder 6, Cylinder 7

DoD System

This function will enable or disable V8 mode, by energizing or de-energizing each individual, VLOM solenoid either ON or OFF. The normal commanded state is OFF.

Cylinder Deactivation System

DoD System

This function will enable or disable V4 mode, by energizing or de-energizing all 4 VLOM solenoids, either ON or OFF. The normal commanded state is OFF.

Cylinder Power Balance

Fuel System

Enables/Disables a cylinder by turning OFF the fuel injector to the cylinder. The fuel injector is normally enabled. The ECM disables the fuel injector when the following conditions are met:

When Disable is selected the ECM turns the injector OFF for 30 seconds. During this period, the engine operates with a misfire.

Engine Controls Ignition Relay

Engine Output Controls

This function will enable or disable the engine controls ignition relay. The scan tool will command the engine controller to turn the relay ON or OFF. The normal commanded state is ON.

Engine Speed Control

TAC System

Activates the throttle activation control (TAC) system to change engine RPM. The normal commanded state is None. To enable the RPM control, all instruction on the scan tool must be completed. The system will increase or decrease the RPM within a range of 350-2,000 RPM. The set step value changes the RPM by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the scan tool.

EVAP Purge Solenoid

Engine Output Controls/EVAP System

Activates the evaporative emission (EVAP) purge valve. The normal commanded state is None. The system will increase or decrease the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure (FTP) exceeds 32 mm Hg (17 in H2O).

EVAP Purge/Seal

Engine Output Controls/EVAP System

This control enables 2 functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON, non-venting. The normal commanded state of both valves is None. The system will increase or decrease the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The second function seals the system after using the purge function to obtain a specific amount of FTP. When activated the purge valve is commanded to 0 percent and the vent valve is commanded ON, non-venting. Both functions remain in the commanded state until one of the following conditions occurs:

EVAP Service Bay Test

Engine Output Controls/EVAP System

Activates the On-board EVAP Diagnostic test.

EVAP Vent Solenoid

Engine Output Controls/EVAP System

Activates the EVAP vent solenoid. The normal commanded state is None. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state until one of the following conditions occurs:

Fuel Composition Reset

Fuel System

Important: Do not use this output control unless the actual alcohol content in the fuel tank is 10 percent or less. False DTCs may set as a result.

Important: This output control does not initiate an ECM fuel composition learn event.

This output control will reset the control module learned alcohol content percentage to 3.

Fuel Injector Balance

Fuel System

Enables the fuel injector in order to verify proper fuel injector flow. The ECM will pulse the selected injector when the following conditions are met:

The selected fuel injector can only be flowed/pulsed once per ignition cycle.

Fuel Pump

Engine Output Controls

Controls the fuel pump relay. The normal commanded state is None. When commanded ON/OFF, the ECM turns the fuel pump ON/OFF. If the engine is running, and the fuel pump is commanded OFF, the engine will stall. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Enable

Fuel System

Disables the ECM ability to learn new fuel trim parameters. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Reset

Fuel System

Activates the reset of fuel trim data in all of the fuel trim cells.

HO2S Heater Command

Heated Oxygen Sensors

Commands HO2S heater ON, 0-100 percent in 10 percent increments while the engine is running.

Idle Spark

Engine Output Controls/Spark Control

Enables or disables idle spark command. When commanded ON, the idle spark will be controlled to 13 degrees before top dead center. The normal commanded state is OFF.

Loop Status

Engine Output Controls

Controls the system loop status. The commanded states include None, Open, or Closed. The normal commanded state is None. When commanded Open or Closed, the system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp

Engine Output Controls

Controls the malfunction indicator lamp (MIL). The commanded states include None, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool.

Misfire Graphic

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Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph.

Spark Retard

Engine Output Controls

This function controls the amount of spark retard. The scan tool will command an increase or decrease in the amount of spark retard in 1-degree increments, within a range of 1-10 degrees. The degrees of spark retard will remain in the commanded state until cancelled by the scan tool. The normal commanded state is NONE.

Throttle Position

TAC System/Throttle Blade Control

Operates TAC motor in 10 percent increments to open or close the throttle blade. The test operates during key ON, engine OFF.