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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1297 (Instrument Panel System Displays & Gauges) >> Diagnostic Information and Procedures >> DTC P0521, P0522, or P0523 >> Circuit/System Testing

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.
  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) sensor.
  2. Ignition OFF, test for less than 1.0 ohm between the low reference circuit terminal listed below and ground:
    • Low Reference Terminal 3 (Gas)
    • Low Reference Terminal 1 (Diesel)
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal listed below and ground:
    • 5-Volts Reference Terminal 2 (Gas)
    • 5-Volts Reference Terminal 3 (Diesel)
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 8 kPa (1.2 psi).
    • If greater than the specified range, test the signal circuit terminal listed below for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
      • Signal Terminal 1 (4.8L, 5.3L or 6.0L Gas)
      • Signal Terminal 2 (6.6L Diesel)
      • Signal Terminal 3 (4.3L Gas)
  5. Install a 3A fused jumper wire between the signal circuit terminal and the 5-volt reference circuit terminal listed below. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 550 kPa (80 psi).
    • Signal Terminal 1 (4.8L, 5.3L or 6.0L Gas)
    • Signal Terminal 2 (6.6L Diesel)
    • Signal Terminal 3 (4.3L Gas)
    • 5-Volts Reference Terminal 2 (Gas)
    • 5-Volts Reference Terminal 3 (Diesel)
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test or replace the EOP sensor.
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