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 P2430-P2433CIRCUIT/SYSTEM VERIFICATION
2006 Isuzu Ascender S, 5.3 M, 4WD
Circuit/System Verification
2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Verification
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, command the secondary air injection pump ON and OFF with a scan tool. The air pump should turn ON and OFF.
- If the air pump does not turn ON or OFF, refer to DTC P0411, P0412, P0418, P2440, or P2444 .
- Command the secondary air injection solenoid ON and OFF. The solenoid should click with each command.
- If the solenoid does not click, refer to DTC P0411, P0412, P0418, P2440, or P2444 .
- Engine running, command the secondary air injection pump ON while observing the secondary air injection pressure sensor parameter. The reading should be 20-25 kPa above the BARO reading.
- Engine running, command the secondary air injection pump and the secondary air injection solenoid ON while observing the secondary air injection pressure sensor parameter. The reading should be 8-10 kPa above BARO.
- Ignition ON, engine OFF, observe that the AIR Pressure Sensor parameter is within 3 kPa of the BARO parameter.
- If not the specified range, verify that the BARO parameter is correct for your altitude. Refer to Altitude Versus Barometric Pressure . If the BARO parameter is not correct for your altitude, refer to DTC P0106 .
- Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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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.