Component Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must perform the Circuit/System Testing in order to verify the integrity of the TC vane position sensor circuits before proceeding with Component Testing.
Erratic Signal Test
- Ignition OFF, disconnect the harness connector at the TC vane position sensor.
- Remove the TC vane position sensor.
- Connect the TC vane position sensor harness connector.
- Ignition ON, observe the scan tool TC Vane Position Sensor parameter while slowly depressing the button at the end of the sensor. There should be a smooth percentage change without any spikes or drop-outs.
- If the TC Vane Position parameter does not increment smoothly or is erratic, replace the TC vane position sensor.