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Home >> Buick >> 2013 >> Encore Base, AWD >> Repair and Diagnosis >> Electrical >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0521 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B37 engine oil pressure switch, 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 1 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 1 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.
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