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Home >> Chevrolet >> 2009 >> Chevy Express G2500, Van Cargo Extended, 6.6 6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L LMM - DTC P1224 To DTC P2463 >> DTC P154D >> Circuit/System Verification

Circuit/System Verification

Observe the following with a scan tool.

  1. The IAH Temp CKT Status parameter should display OK.
  2. The IAH can be commanded ON with a scan tool.
  3. Engine running, observe the DTC information with a scan tool. DTC P154D should not set.
  4. 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 data.
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