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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISELECTRICALGAUGESINSTRUMENT PANEL SYSTEM DISPLAYS & GAGESDIAGNOSTIC INFORMATION AND PROCEDURESENGINE OIL PRESSURE INDICATOR ALWAYS ONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector of the EOP sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal 1 and ground.
    • If greater than 1 ohm, test the low reference circuit for a short to voltage or 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 2 and ground.
    • If less than 4.8 volts, 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 5.2 volts, 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 display is greater than 550 kPa (80 psi).
    • If less than 550 kPa (80 psi), test the signal circuit for a short to ground. If the circuit tests normal replace the ECM.
  5. Install a 3-amp fused jumper between the signal circuit terminal 3 and the low reference circuit terminal 1. Verify the scan tool Engine Oil Pressure Sensor parameter display is less than 8 kPa (1.2 psi).
    • If greater than 8 kPa (1.2 psi), test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Ignition ON, command the indicators OFF with the scan tool.
    • If the EOP indicator does not turn OFF, replace the IPC.
  7. If all circuits test normal, replace the EOP sensor.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.