K 2500 Yukon 4WD V8-6.0L VIN U (2000)
DIAGNOSTIC AIDS
IMPORTANT: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing
or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
For an intermittent, refer to Symptoms. See: Testing and Inspection/Symptom Related Diagnostic Procedures
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Further circuit diagnosis may require I/P removal. Test the circuit from the PCM to the tachometer for being open, shorted to ground or, voltage.
3. This step is testing for the proper signal voltage.
4. This step is testing for an open circuit between the IPC and connector C100.
5. This step is testing for a grounded circuit between the IPC and connector C100.
6. This step is testing for an open circuit between the PCM and connector C100.
7. This step is testing for a grounded circuit between the PCM and connector C100.