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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1654 (Engine Control System & Fuel System - Hybrid (Hp2) 6.0L (LZ1) - Troubleshooting And Diagnosis) >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF.
  2. Engine idling, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:
    • MIL Circuit Short to Gnd Test Status
    • MIL Circuit Open Test Status
    • MIL Circuit Short to Voltage Test Status

      Each parameter should toggle between OK and Not Run or Not Run and OK.

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