Use the scan tool data listed in this table for comparison after the On-Board Diagnostic system check and finding the on-board diagnostics function properly with no diagnostic codes displayed.
The Typical Scan Tool Data Values are an average of display values recorded from normally operating vehicles. The Typical Scan Tool Data Values are intended to represent what a normally functioning system would display. The values you get may vary due to a low battery charge or other reasons. But they should be very close.
Do not use a scan tool that displays faulty data. Report the problem to the manufacturer. The use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Use only the parameters listed in the tables for diagnosis. If a scan tool reads other parameters, the values are not recommended by General Motors for use in diagnosis. For more description on the values and the use of the scan tool diagnosis the PCM inputs, refer to the applicable diagnosis. If all values are within the range illustrated, refer to Driveability Symptoms.
Scan Tool Data
Engine at Operating Temp/Closed Throttle/Park or Neutral/All Acc. OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Speed | RPM | 652 RPM |
ECT | °C/°F | 93°C (200°F) |
Startup ECT | °C/°F | Varies |
ECT Sensor | Volts | 2.00 Volts |
IAT Sensor | Volts | 1.46 Volts |
IAT Sensor | °C/°F | 43°C (109°F) |
ESO Solenoid | on/off | on |
Boost Solenoid | % | 60-70% |
Boost Pressure | kPa | 60-103 kPa |
Actual EGR | kPa | 75-85 kPa |
Desired EGR | kPa | 75-85 kPa |
EGR Solenoid | % | 35-45% |
EGR Vent Solenoid | on/off | on |
Fuel Temperature | °C/°F | 70°C (159°F) |
Fuel Rate | millimeters cubed | 7-12 mm3 |
Glow Plug | Volts | 0 Volts |
Glow Plug System | disabled/enabled | Disabled |
Des. Inj Timing | Degrees | 4-7 Degrees |
Act. Inj. Timing | Degrees | 4-7 Degrees |
APP Angle | % | 0% |
APP 1 | Volts | 0.44-0.95 Volts |
APP 2 | Volts | 4.0-4.5 Volts |
APP 3 | Volts | 3.6-4.0 Volts |
Inj. Pump Closure Time | milliseconds | 1.70-1.90 ms |
TDC Offset | Degrees | +0.75 to -1.75 |
Ignition Volts | Volts | 12-14 Volts |
MPH/KPH | MPH/KPH | 0 MPH/KPH |
Cruise Switch | on/off | off |
Cruise Active | on/off | off |
Cruise Brake Switch | open/closed | closed |
Brake Switch | open/closed | open |
Set Switch | on/off | off |
Resume Switch | on/off | off |
TR Switch | Park-Neutral,Reverse,Drive 1, Drive 2, Drive 3 | Park |
Crank Ref Missed | Counts | 0 |
Inj. Pump Cam Reference Missed | Counts | 0 |
Lift Pump | Volts | 12-15 Volts |
Lift Pump System | disabled/enabled | enable |
Engine Load | % | 4-6% |
Engine Torque | ft lb | 7-10 ft lb |
# of Curr. DTCs | Counts | 0 |
DTC Set This Ign. | Counts | 0 |
TFT Sensor | Volts | 2.5-3.5 Volts |
TFT | C°/F° | 70°C (158°F) |
Calc. A/C Load | ft lb | 0 ft lb |
A/C Request | on/off | off |
A/C Compressor | engaged/disengaged | disengaged |
A/C Relay | yes/no | no |
MIL Lamp | on/off | off |
STS Lamp | on/off | off |
4WDL Mode | enabled/disabled | disabled |
Front Axle Switch | unlocked/locked | unlocked |
A/B/C Range Switch | on on on/off off off | off off off |
1-2 Sol 2-3 Sol | on/off | on off |
TCC Enable | on/off | off |
PC Solenoid | on/off | off |
Device Control | yes/no | no |
Engine Run Time | seconds | 0 |
