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Home >> Cadillac >> 2017 >> XTS Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.6L (LFX LF3) - DTC P050D To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P1400: Cold Start Emission Reduction Control System >> Circuit/System Verification
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Circuit/System Verification

  1. Verify that the conditions listed below do not exist:
    • Damage, restriction, water intrusion or modification of the air intake system.
    • Dirty or deteriorating air filter element
    • Crankcase ventilation system for correct operation - Refer to Crankcase Ventilation System Inspection/Diagnosis .
    • Vacuum leak or other un-metered air downstream of the mass air flow (MAF) sensor
    • Intake manifold leak
    • Exhaust leak
    • Water intrusion
    • Damaged, restricted, modified or enhanced exhaust system - Refer to Symptoms - Engine Exhaust .
    • If any of the conditions exist 

      Repair as necessary.

    • If none of the conditions exist 
  2. Verify an engine mechanical condition does not alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
    • If any of the conditions exist 

      Repair as necessary.

    • If none of the conditions exist 
  3. Vehicle OFF, allow the engine to cool to be within the temperatures listed in the Conditions for Running the DTC.
  4. Engine running.
  5. 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.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to step <p01>

    • If the DTC does not set 
  7. All OK.
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