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 4 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0013 TO P0134)DTC P0101 OR P1101CIRCUIT/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 ON the ignition, with the engine OFF.
- Measure the battery voltage.
- Disconnect the MAF sensor.
- Connect a test lamp between the MAF sensor ignition 1 voltage circuit and a good ground.
- With the test lamp still connected, measure for battery voltage between the ignition 1 voltage circuit and a good ground.
- If the voltage is not within 1.5 volts of battery voltage, repair the high resistance in the circuit.
- Measure for a proper range of 4.9-5.2 volts between the MAF sensor signal circuit and a good ground.
- If the voltage is less than 4.9 volts, test the circuit for a high resistance.
- If the voltage is within the specified range, test the circuit for a short to the IAT signal circuit or to any other 5-volt reference circuit.
- Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control modules to power down before taking a resistance measurement.
- Measure for a proper value of less than 5 ohms of resistance between the ground circuit of the MAF sensor and a good ground.
- If the resistance is more than 5 ohms, repair the high resistance in the ground circuit.
- Connect the J 38522 to the vehicle. See Special Tools . Refer to the Component Testing procedure below.
- Start the engine and observe the MAF Sensor parameter for a proper range of 4,950-5,025 Hz.
- If the MAF Sensor parameter is not within the specified range, replace the PCM.
- If the MAF Sensor parameter is within the specified range, replace the MAF sensor.
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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.