Circuit/System Testing
WARNING: This page is about a different car, the 2006 Saturn Ion 3. However, it is still accessible from the selected car via links, so may be relevant.
- 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 high resistance and 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 all of 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. Refer to Component Testing .
- 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 ECM.
- If the MAF Sensor parameter is within the specified range, replace the MAF sensor.