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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1387 (Engine Controls And Fuel - 6.6L - DTC P2544 To DTC P2693) >> DTC P2564 or P2565 >> Component Testing >> Erratic Signal Test

Erratic Signal Test

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the TC vane position sensor.
  2. Remove the TC vane position sensor.
  3. Connect the TC vane position sensor harness connector.
  4. Ignition ON, observe the scan tool TC Vane Position Sensor voltage while slowly depressing the plunger at the end of the TC Vane Position Sensor. The voltage should decrease smoothly from approximately 4.9-0.2 V.
    • If the TC Vane Position Sensor voltage drops out or spikes, replace the TC vane position sensor. It is normal for the TC Vane Position voltage to quickly return to approximately 4.9 V as the plunger reaches its fully depressed position.
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