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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1040 (Engine Controls And Fuel - 6.6L - Troubleshooting & Diagnosis) >> High Idle Switch Diagnosis >> Component Testing

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.
  1. Ignition OFF, disconnect the harness connector at the high idle switch.
  2. Test for infinite resistance between the signal terminal C and the ground circuit terminal A with the switch in the open position.
    • If less than infinite resistance, replace the high idle switch.
  3. Test for less than 1 ohm between the signal terminal C and the ground terminal A with the switch in the closed position.
    • If greater than 1 ohm, replace the high idle switch.
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