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 5 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0135 TO P0418)DTC P0411CIRCUIT/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.
- With the engine running, the AIR pump outlet hose disconnected from the AIR solenoid inlet, and the AIR pump enabled with a scan tool, observe pressurized airflow at the hose outlet.
- If pressurized airflow is not detected, test the AIR pump inlet and outlet hoses/pipes for a restriction or a faulty pump.
- With the ignition ON, the engine OFF, and the AIR solenoid substituted with a test lamp, observe that the test lamp is not illuminated.
- If the test lamp is illuminated, test for the following:
- A short to voltage in the AIR solenoid valve voltage supply circuit
- A short to ground in the AIR solenoid valve relay control circuit
- A faulty AIR solenoid valve relay
- A faulty control module
- If the test lamp is illuminated, test for the following:
- With the engine running, the AIR solenoid substituted with a test lamp, and the AIR solenoid enabled with a scan tool, observe that the test lamp is illuminated.
- If the test lamp is not illuminated, test for the following:
- High resistance or a short to ground in the AIR solenoid voltage supply circuit or either AIR solenoid relay voltage supply circuit
- High resistance in the AIR solenoid ground circuit
- A faulty AIR solenoid relay
- High resistance or a short to voltage in the AIR solenoid relay control circuit
- A faulty control module
- If the test lamp is not illuminated, test for the following:
- Test the AIR solenoid outlet pipe for a restriction.
- If a restriction is detected, remove the restriction or replace the pipe.
- If all other circuits and components test OK, replace the AIR solenoid.
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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.