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Circuit/System Testing

NOTE:
  • Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
  • Verify proper engine oil level before continuing with diagnosis.
  1. Ignition OFF/Vehicle OFF, and all vehicle systems OFF, disconnect the harness connector at the B35 Engine Oil Level Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal C and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 10 Ω 
  3. Ignition ON/Vehicle in Service Mode
  4. 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 K20 Engine Control Module.

    • If the Engine Oil Level Switch parameter reads Low 
    5. NOTE:

    If a short to voltage is found on the signal circuit, the fuse in the 3A jumper wire will open.

  5. Install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal C.
  6. 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 K20 Engine Control Module.

    • If the Engine Oil Level Switch parameter reads OK 
  7. Test or replace the engine oil level sensor and/or switch.
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