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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1042 (Engine Controls And Fuel - 6.6L - Troubleshooting & Diagnosis) >> High Idle Switch Diagnosis >> Circuit/System Testing

Circuit/System 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 less than 5 ohms between the ground circuit terminal A and ground.
    • If greater than 5 ohms, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool High Idle switch parameter is OFF.
    • If not OFF, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool High Idle switch parameter is ON.
    • If not ON, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the high idle switch.
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