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Circuit/System Testing

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.
NOTE: Verify proper engine oil level before continuing with diagnosis.
  1. Ignition OFF, disconnect the harness connector at the engine oil level sensor and/or switch.
  2. Ignition OFF, test for less than 2 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Engine Oil Level Switch parameter reads Low.
    • If the Engine Oil Level Switch parameter reads OK, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
    4. NOTE: If a short to voltage is found on the signal circuit, the fuse in the 3A jumper wire will open.
  4. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool Engine Oil Level Switch parameter reads OK.
    • If the Engine Oil Level Switch parameter reads Low, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the engine oil level sensor and/or switch.
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