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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 Verification

Circuit/System Verification

IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  1. If DTC P0112, P0113, P0097, or P0098 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. If the ignition has been OFF for more than 10 hours, the ECT, IAT, and IAT 2, should be within 6°C (11°F) of each other and also the ambient temperature. Turn ON the ignition, with the engine OFF, use a scan tool to observe the IAT 2 and the ECT sensor parameters. Compare all those sensor parameters to each other and also to the ambient temperature. A slight to moderate resistance in either signal or low reference circuit, can widen the spread between the 2 IAT sensors, and cause this DTC to set.
  3. An IAT sensor that is skewed lower at various ambient temperatures, due to more resistance than is normal, can widen the spread between the two sensors and cause this DTC to set. Measure and record the resistance of the IAT and IAT 2 sensors at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature vs Resistance (ECT Sensor) or Temperature vs Resistance (IAT Sensor) or Temperature vs Resistance (IAT 2 Sensor) or Temperature vs Resistance (Fuel Temperature) .
  4. Inspect both IAT sensors terminals, for corrosion or a poor connection.
  5. If the ignition has been OFF for more than 10 hours, then determine which IAT sensor is skewed by comparing ECT, IAT, and IAT 2 sensor parameters with a scan tool.
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