NGC Powertrain Verification Test Ver - 4

NGC POWERTRAIN VERIFICATION TEST VER - 4

For a complete wiring diagram Refer to Diagrams/Electrical.

Diagnostic Test

1.NGC POWERTRAIN VERIFICATION TEST VER - 4

NOTE: If this vehicle is equipped with an Electronic Throttle Control system, and the APP Sensors, PCM, or Throttle Body Assembly have been replaced, use the scan tool to perform the ETC RELEARN function.

NOTE: 2. After completing the Powertrain Verification Test the Transmission Verification Test must be performed.

NOTE: 3. If the PCM has been replaced and the correct VIN and mileage have not been programmed, a DTC will set in the ABS Module, Airbag Module and the SKIM.

NOTE: 4. If the vehicle is equipped with a Sentry Key Immobilizer System, Secret Key data must be updated. Refer the PCM, SKIM and the Transponder (ignition key) for programming information.

5. Inspect the vehicle to make sure that all engine components are properly installed and connected.

6. Connect the scan tool to the data link connector and erase all codes.

7. Turn the speed control ON (if equipped, cruise light will be on).

8. Depress and release the SET Switch when the vehicle speed is greater than 35 MPH. The speed control should engage and hold the selected speed.

9. Press and hold the RESUME/ACCEL Switch. The vehicle speed should increase by at least 2 MPH.

10. Press and hold the COAST switch. The vehicle speed should decrease.

11. Using caution, press and release the brake pedal. The speed control should disengage.

12. Bring the vehicle speed back up to 35 MPH.

13. Press the RESUME/ACCEL switch. The speed control should resume the previously set speed.

14. Hold down the SET switch. The vehicle should decelerate.

15. Make sure vehicle speed is greater than 35 mph and release the SET Switch. The vehicle should adjust and set a new vehicle speed.

16. Press and release the CANCEL switch. The speed control should disengage.

17. Bring the vehicle speed back up above 35 mph and engage speed control.

18. Turn the Speed Control Off. (Cruise light will be off). The speed control should disengage.

NOTE: OVERSHOOT/UNDERSHOOT FOLLOWING SPEED CONTROL SET.

20. If the vehicle operator repeatedly presses and releases the SET button with their foot off of the accelerator (referred to as "lift foot set"), the vehicle may accelerate and exceed the desired set speed by up to 5 mph (8 km/h).

21. It may also decelerate to less than the desired set speed, before finally achieving the desired set speed.

22. The Speed Control System has an adaptive strategy that compensates for vehicle-to-vehicle variations in speed control cable lengths.

23. When the speed control is set with the vehicles operators foot off of the accelerator pedal, the speed control thinks there is excessive speed control cable slack and adapts accordingly.

24. If the "lift foot sets" are continually used, a speed control overshoot/undershoot condition will develop.

25. To "unlearn" the overshoot/undershoot condition, the vehicle operator has to press and release the set button while maintaining the desired set speed using the accelerator pedal (not decelerating or accelerating).

26. Then turn the cruise control switch to the OFF position (or press the CANCEL button if equipped) after waiting 10 seconds.

27. This procedure must be performed approximately 10-15 times to completely unlearn the overshoot/undershoot condition.

NOTE: The PCM can detect and compensate for variances in the engine and its components. To learn these variations, the PCM uses the input of the actual crankshaft rotation pattern and ideal crankshaft rotation pattern that has been calibrated into the PCM. The PCM then compares the two patterns. The variation between the two values is the Adaptive Numerator. If the Adaptive Numerator is not learned by the PCM, the misfire monitor will not run and the Multi-Cylinder Displacement System (MDS) will not operate. Without MDS operation, the customer will experience decreased fuel economy. If the customer experiences decrease fuel economy or after any repair use the scan tool to ensure that the Adaptive Numerator is learned.

Did the Speed Control pass the above test?

Yes

- Repair is complete.

No

- Check for any related Technical Service Bulletins and/or refer to the appropriate Diagnostic Procedure.