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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510) >> DTC P2199 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.
  1. A slight to moderate resistance in either signal or low reference circuit, can widen the spread between the two IAT sensors, and cause this DTC to set.
  2. 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 sensor 1 and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature Versus Resistance (ECT Sensors) or Temperature Versus Resistance (Fuel Temperature Sensor) or Temperature Versus Resistance (IAT Sensor 2) or Temperature Versus Resistance (IAT Sensor 1) .
  3. Inspect IAT sensor 1 and sensor 2 terminals, for corrosion or a poor connection.
  4. If the ignition has been OFF for more than 10 hours, then determine which IAT sensor is skewed by comparing ECT, IAT sensor 1, and IAT sensor 2 parameters with a scan tool.
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