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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 P0107 or P0108 >> 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.
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the MAP sensor.
  3. Connect a test lamp between the MAP sensor 5-volt reference circuit and a good ground.
    IMPORTANT: The MAP sensor 5-volt reference circuit is spliced to other components of the vehicle.
  4. Measure for a proper range of 4.8-5.2 volts between the MAP sensor 5-volt reference circuit and a good ground.
    • If the voltage is less than the specified range, then test the circuit for a high resistance, an open, a short to ground, or a faulty ECM.
    • If the voltage is more than the specified range, then test the circuit for a short to voltage or a faulty ECM.
  5. With the MAP sensor still disconnected, use the scan tool to observe the MAP Sensor parameter for the proper value of less than 12 kPa.
    • If the MAP Sensor parameter is more than 12 kPa, then test the MAP sensor signal circuit for a short to voltage, or a faulty ECM.
  6. Connect a jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit.
  7. Use the scan tool to observe the MAP Sensor parameter for the proper value of more than 103 kPa.
    • If the MAP Sensor parameter is less than 103 kPa, then test the MAP sensor signal circuit for a high resistance, an open, a short to ground, or 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 low reference circuit of the MAP sensor and a good ground.
    • If the resistance is more than 5 ohms, then test the circuit for a high resistance. If the MAP sensor low reference circuit tests normal, then replace the ECM.
  10. If all of the MAP sensor circuits test normal, then replace the MAP sensor.
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