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Home >> Saturn >> 2006 >> Ion Red Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls - 2.4L - DTC P0010 To DTC P0341) >> DTC P0102 or P0103 >> Circuit/System Testing
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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.

DTC P0102

  1. Inspect the fuse in the ignition 1 voltage circuit of the MAF sensor.
    • If the fuse is open, test the spliced circuits and the components for a short to ground.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure the battery voltage.
  4. Disconnect the MAF sensor.
  5. Connect a test lamp between the MAF sensor ignition 1 voltage circuit and a good ground.
  6. 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 or the open in the circuit.
  7. 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 within the proper range, test the circuit for a high resistance.
    • If the voltage is less than 4.9 volts, test the circuit for a short to ground, a high resistance, an open, or for a faulty ECM.
    • If the voltage is more than 5.2 volts, test the circuit for a short to voltage, or for a faulty ECM.
  8. 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.
  9. 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 or the open in the ground circuit.
  10. Connect the J 38522  to the vehicle. Refer to Component Testing .
  11. 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.

DTC P0103

  1. Connect the J 38522  to the vehicle. Refer to Component Testing .
  2. 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.
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