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Home >> Saturn >> 2009 >> Sky Red Line, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L - DTC P0700 To DTC P2544 >> DTC P2199 >> Circuit/System Testing
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Circuit/System Testing

  1. Verify that the induction system components are properly positioned and connected.
  2. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  3. Ignition OFF for 90 seconds, test for less than 5 ohms between the MAF sensor ground circuit terminal B and ground.
    • If greater than the specified range, test the MAF sensor ground circuit for an open/high resistance.
  4. Test for less than 5 ohms between the IAT low reference circuit terminal D and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Disconnect the harness connector at the intake air pressure and temperature sensor.
  6. Test for less than 5 ohms between the low reference circuit terminal 1 or A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Disconnect the ECM.
  8. Test for less than 5 ohms between the IAT sensor signal circuit terminal E and the ECM connector X2, terminal 50.
    • If greater than the specified range, test the IAT sensor signal circuit for an open/high resistance.
  9. Test for less than 5 ohms between the IAT sensor 2 signal circuit terminal 2 or B and the ECM connector X1, terminal 86.
    • If greater than the specified range, test the IAT sensor 2 signal circuit for an open/high resistance.
  10. If the circuits test normal, test both the IAT sensor and the IAT sensor 2.
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