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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P2199 >> Circuit/System Testing

Circuit/System Testing

  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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