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Home >> Saturn >> 2007 >> Sky Red Line, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 2.0L - DTC P2097 To P2310 >> DTC P2199 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the MAF/IAT harness connector at the MAF/IAT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the MAF sensor ground circuit and ground.
    • If greater than the specified range, test the MAF sensor ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 5 ohms of resistance between the IAT low reference circuit 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.
  4. Ignition OFF, disconnect the IAT sensor 2 harness connector at the boost pressure sensor.
  5. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit 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.
  6. Ignition OFF, disconnect the ECM.
  7. Ignition OFF, test for less than 5 ohms of resistance on the IAT sensor signal circuit.
    • If greater than the specified range, test the IAT sensor signal circuit for an open/high resistance.
  8. Ignition OFF, test for less than 5 ohms of resistance on the IAT sensor 2 signal circuit.
    • If greater than the specified range, test the IAT sensor 2 signal circuit for an open/high resistance.
  9. If the circuits test normal, test both the IAT sensor and the IAT sensor 2.
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