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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P2199 >> Circuit/System Testing

Circuit/System Testing

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  1. With the ignition OFF, disconnect the IAT 2 and ECM connectors, with a DMM, measure for a resistance of less than 10 ohms on the signal and low reference circuits between IAT 2 and the ECM.
    • If the resistance is more than 10 ohms, repair the circuit with the high resistance.
  2. With the ignition OFF, disconnect the IAT and ECM connectors, with a DMM, measure for a resistance of less than 10 ohms on the signal and low reference circuits between the IAT and ECM.
    • If the resistance is more than 10 ohms, repair the circuit with the high resistance.
  3. Remove and test the IAT 2 and IAT sensors. Refer to Component Testing in this diagnostic.
    • If all circuits and sensors test OK, replace the ECM.
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