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HOMESERVICE MANUALSISUZU2006ASCENDER S, 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 236 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.2L - DTC P0135 TO DTC P0420)DTC P0351-P0356CIRCUIT/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. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Test the affected IC circuit for a high resistance, an open, a short to ground and for a short to voltage.
    • If a fault is found, repair the circuit as needed.
  4. Connect the PCM.
  5. Exchange the affected ignition coil with the ignition coil of a good cylinder.
  6. Start the engine and observe the scan tool.
    • If the DTC transfers with the suspect ignition coil, replace as needed.
    • If the DTC does not transfer with the suspect ignition coil, replace the PCM.
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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.