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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 3.6L (LF4 LGX) - DTC P0121 LF4 To DTC P0685 LF4) >> Diagnostic Information and Procedures >> DTC P023A-P023C: Charge Air Cooler Coolant Pump Relay >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON
  2. Verify the circuit status parameters listed below do not display Malfunction when commanding the Charge Air Cooler Coolant Pump ON and OFF with a scan tool:
    • Charge Air Cooler Coolant Pump Relay Control Circuit Low Voltage Test Status
    • Charge Air Cooler Coolant Pump Relay Control Circuit Open Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing - Control Circuit Low Voltage or Open

    • If Malfunction is not displayed 
  3. Verify the Charge Air Cooler Coolant Pump Relay Control Circuit High Voltage Test Status does not display Malfunction when commanding the Charge Air Cooler Coolant Pump ON and OFF with a scan tool.
    • If Malfunction is displayed 

      Refer to Circuit/System Testing - Control Circuit High Voltage

    • If Malfunction is not displayed 
  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.
  5. Verify a DTC does not set.
    • If a DTC sets 

      Refer to Circuit/System Testing

    • If a DTC does not set 
  6. All OK
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