Test Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 5. This step tests for an intermittent short or open condition in the engine wiring harness. The test lamp is used as a resistor in the circuit.
- 6. This step determines if the PCM or the TFT sensor is causing a steady, unchanging TFT reading.