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 VARIANT/TRIMSECTION 6 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0420 TO P1682)DTC P0443CIRCUIT/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 variant/trim than selected.
- Turn OFF the ignition.
- Disconnect the EVAP canister purge solenoid valve.
- Turn ON the ignition, with the engine OFF.
- Probe the ignition 1 voltage circuit of the EVAP canister purge solenoid valve with a test lamp that is connected to a good ground.
- If the test lamp does not illuminate, test the circuit for an open or for a short to ground.
- Connect a test lamp between the control circuit of the EVAP canister purge solenoid valve and the ignition 1 voltage circuit of the EVAP canister purge solenoid valve.
- If the test lamp illuminates, test the control circuit of the EVAP canister purge solenoid valve for a short to ground.
- Command the EVAP canister purge solenoid valve to 50 percent with a scan tool.
- If the test lamp does not flash or illuminate with the command, test the control circuit of the EVAP canister purge solenoid valve for an open or for a short to voltage.
- If the circuits and the control module test normal, replace the EVAP canister purge solenoid valve.
RENDER: 1.0x
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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.