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Home >> Cadillac >> 2012 >> SRX AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0520 >> Circuit/System Testing

Circuit/System Testing

With LUK engine 

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
  2. Verify the scan tool Engine Oil Pressure Switch parameter is OK.
    • If not OK 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If OK 
  3. Install a 3 A fused jumper wire between the signal circuit terminal A and ground.
  4. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not Low 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal 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 Low 
  5. Test or replace the B37 Engine Oil Pressure Switch.

Without LUK engine 

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
  2. Test for less than 1 V between the low reference circuit terminal B and ground.
    • If 1 V or greater 

      repair the short to voltage on the circuit.

    • If less than 1 V 
  3. Ignition OFF.
  4. Test for less than 10 Ω between the low reference circuit terminal B and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
    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 P16 instrument cluster.
    • If less than 10 Ω 
  5. Ignition ON.
  6. Verify the scan tool Engine Oil Pressure Switch parameter is OK.
    • If not OK 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If OK 
  7. Install a 3 A fused jumper wire between the signal circuit terminal A and low reference circuit terminal B.
  8. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not Low 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal 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 Low 
  9. Test or replace the B37 Engine Oil Pressure Switch.
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