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Circuit/System Testing

  1. If the vehicle is equipped with ABS, test the circuit between the EBCM and the ECM for an open/high resistance.
  2. Ignition OFF, disconnect the harness connector of the rough road sensor.
  3. Ignition ON, test for less than 0.2 volt between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
    5. IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
  5. Ignition ON, load test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. Ignition ON, verify that the scan tool rough road sensor voltage parameter is less than 0.1 volt.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  7. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the rough road sensor parameter is greater than 4.8 volts.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  8. If all circuits/connections test normal, replace the rough road sensor.
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