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Home >> Chevrolet >> 2014 >> Spark LS, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> DTC P0521 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2013 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  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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