Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Observe the DTCs with the scan tool.
- If DTC P0602 is set, attempt to program the ECM before replacing the ECM. Refer to Service Programming System (SPS) .
- If DTC P0602 resets, replace the ECM.
- Test the voltage and ground inputs to the ECM for the following:
- A short
- An open
- High resistance
IMPORTANT:
An intermittent or momentary, less than 1 second, loss of system voltage during throttle tip-in may set DTC P060D.
- If all circuits test normal, replace the ECM.