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Home >> Chevrolet >> 2006 >> Chevy Express G3500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0016 To DTC P0342 >> DTC P0117 or P0118 >> Circuit/System Testing

Circuit/System Testing

P0117

  1. Disconnect the ECT sensor.
  2. Turn ON the ignition with the engine OFF.
  3. Observe the ECT sensor parameter with a scan tool.
    • If the ECT sensor parameter is more than 149°C (300°F), test the ECT signal circuit for a short to ground or a faulty ECM.
    • If the ECT sensor parameter is less than -39°C (-38°F), replace the ECT sensor.

P0118

  1. Disconnect the ECT sensor.
  2. Turn the ignition ON with the engine OFF.
  3. Measure the voltage between the ECT signal circuit and a good ground with a DMM.
    • If the voltage is more than 5 volts, test the ECT signal circuit for a short to voltage.
    • If the voltage is less than 4.9 volts, test the ECT signal circuit for an open or a faulty ECM.
  4. Measure the voltage between the ECT low reference circuit and the ECT signal circuit.
    • If the voltage is more than 5 volts, test the ECT low reference circuit for a short to voltage or a faulty ECM.
    • If the voltage is less than 4.9 volts, test the ECT low reference circuit for an open or a faulty ECM.
    • If the voltage is between 4.9-5 volts, test the ECT low reference circuit and the ECT signal circuit for high resistance.
  5. If the ECT sensor circuits test normal, replace the ECT sensor.
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