Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 591 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.2L - DTC P0366 T0 DTC P2544)DTC P0650CIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 5.3 M, 4WD
Circuit/System Testing
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, verify that the IPC warning indicators are illuminated.
- If the IPC warning indicators are not illuminated, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the IPC.
- Ignition OFF, disconnect ECM X1 harness connector. Ignition ON, the MIL should not illuminate.
- If the MIL is illuminated, test the MIL control circuit terminal listed below for a short to ground. If the circuit tests normal, replace the IPC.
- ECM terminal X1-27 for RPO LE5
- ECM terminal X1-12 for RPO LAT
- If the MIL is illuminated, test the MIL control circuit terminal listed below for a short to ground. If the circuit tests normal, replace the IPC.
- Ignition ON, connect a 3A fused jumper wire between the MIL control circuit terminal listed below and ground. The MIL should illuminate.
- ECM terminal X1-27 for RPO LE5
- ECM terminal X1-12 for RPO LAT
- If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC/bulb.
- If all circuits/connections test normal, replace the ECM.
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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.