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, 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 234 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 5.3L - DTC P0016 TO DTC P0341)DTC P0101 OR P1101CIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 4.2 S, 4WD
Circuit/System Testing
2006 Isuzu Ascender S, 4.2 S, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
- If P0106 or P0121 is set, diagnose first.
- 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 0.75 volts of battery voltage, repair the high resistance in the circuit.
- Measure the voltage between the MAF sensor signal circuit and a good ground for 4.9-5.2 volts.
- If the voltage is less than 4.9 volts, test the circuit for high resistance or an open.
- If the voltage is within 4.9-5.2 volts, 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 module to power down before taking a resistance measurement.
- Measure the resistance between the ground circuit of the MAF sensor and a good ground for less than 5 ohms of resistance. You should measure less than 5 ohms of resistance.
- If the resistance is more than 5 ohms, repair the high resistance in the ground circuit.
- Turn OFF the ignition and connect the red lead of the J 38522 to the signal circuit of the MAF sensor harness connector and the black lead to a good ground.
- Start the engine and observe the MAF sensor for a range of 4,950-5,025 Hertz.
- If the MAF sensor is not within the specified range, test for intermittent or poor connections at the control module. If test OK, replace the control module.
- If the MAF sensor is within the specified range, test for intermittent or poor connections at the control module. If test OK, replace the MAF sensor.
IMPORTANT:
To set up the J 38522
, place the duty cycle to normal, the frequency to 5K and the signal switch to 5 volts.
RENDER: 1.0x
NO RELATED
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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.