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HOMESERVICE MANUALSISUZU2006ASCENDER S, 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 233 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.2L - DTC P0013 TO DTC P0134)DTC P0116CIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 4.2 S, 4WD

Circuit/System Testing

2006 Isuzu Ascender S, 4.2 S, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Isuzu Ascender, 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the ECT sensor.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure for the proper range of 4.9-5.2 volts between the ECT sensor signal circuit and a good ground with a DMM.
    • If the voltage is less than 4.9 volts, test the ECT sensor signal circuit for a high resistance short to ground.
    • If the ECT sensor signal circuit tests normal and the voltage is still not within the proper range, then replace the PCM.
  4. Remove and test the ECT sensor. Refer to Component Testing .
    • If the resistance measurements of the ECT sensor are out of range, replace the sensor.
    • If the ECT sensor tests normal and the DTC continues to set, then replace the PCM.
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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.