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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1658 (Engine Control System & Fuel System - 6.6L (LMM) - Troubleshooting And Diagnosis) >> High Idle Switch Diagnosis >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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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