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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 P154B >> Circuit/System Verification

Circuit/System Verification

  1. With the ignition ON, observe that the IA Heater Undervoltage parameter displays OK. Observe that the IAH volts displays near ignition 1 signal volts.
  2. Observe that the IAH can be commanded ON with a scan tool.
  3. Engine running, observe the DTC information with a scan tool. DTC P154B 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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