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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1803 (ENGINE CONTROLS AND FUEL - 4.4L - DTC P0153 TO DTC P0651)DTC P0196CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the EOT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.
    • 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, verify the scan tool EOT Sensor parameter is colder than -39°C (-38°F).
    • If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
    4. IMPORTANT: If the 3A fuse in the jumper wire opens, the signal circuit s shorted to a voltage and the sensor may be damaged.
  4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal C. verify the scan tool EOT Sensor parameter is warmer than 149°C (300°F).
    • If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, disconnect the harness connectors at the ECM.
  6. Test for infinite of resistance between the oil temperature sensor signal circuit terminal B and the oil level switch signal circuit terminal A.
    • If less than the specified range, repair the short circuit between the oil temperature sensor signal circuit and the oil level switch signal circuit.
  7. If all circuits test normal, replace the engine oil level sensor and/or switch assembly.
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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.