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Home >> Saturn >> 2008 >> Astra XE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P000A To DTC P0365 >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, verify the integrity of the air induction system by inspecting for the following conditions:
    • Damage to the MAF sensor
    • Loose or improper installation
    • An air flow restriction
    • In cold climates, inspect for any snow or ice buildup
    • Inspect the MAF sensor elements for contamination
  2. Disconnect the harness connector at the MAF/IAT sensor.
  3. Ignition OFF for 90 seconds, test for less than 5.0 ohms between the low reference circuit terminal 1 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Verify the scan tool MAF Sensor parameter is less than 0.50 volt.
    • If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Ignition ON, connect a test lamp between B+ and the signal circuit terminal 3.
  7. Verify the scan tool MAF Sensor parameter is greater than 4.3 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If the circuits test normal, replace the MAF sensor.
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