NGC

*CHECKING FOR AN INTERMITTENT DTC

For a complete wiring diagram Consult Diagrams/Electrical

Diagnostic Test

1. CHECKING FOR AN INTERMITTENT DTC

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

The conditions necessary to set this DTC are not present at this time.
Review the scan tool environmental data and Freeze Frame. If possible, try to duplicate the conditions under which the DTC set.
If applicable, actuate the component with the scan tool.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change other than as expected, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins (TSBs) that may apply.
Turn the ignition off.
Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
Perform a voltage drop test on the related circuits between the suspected component and the PCM.
Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
If multiple trouble codes were set, use a schematic and inspect any common ground or supply circuits.
For intermittent misfire DTCs check for restrictions in the intake and exhaust system, proper installation of all sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
Use the scan tool to perform a system test if one applies to the component.
A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
Were any problems found during the above inspections?

Yes

- Repair as necessary.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Test Complete.