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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P026E, P10BA, P1384, P2B83, P2B84, P30AE, P30AF, U02A9, or U05AA >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine - Idling - At normal operating temperature
  2. Verify DTC U02A9, U05AA, U1348 is not set and no other DTCs are set.
    • If DTC U02A9, U05AA, U1348 is set and no other DTCs are set 

      Refer to: Circuit/System Testing

    • Go to next step: If DTC U02A9, U05AA, U1348 is not set and other DTCs are set 
  3. Perform the scan tool control function: Charge Air Cooler Coolant Pump Speed - Command the component to the maximum position/speed - For greater than 180 s

    Verify the scan tool parameter:

    • Charge Air Cooler Coolant Pump Dry = No
    • Charge Air Cooler Coolant Pump Overtemperature = No
    • Charge Air Cooler Coolant Pump Stalled = No
    • Charge Air Cooler Coolant Pump Speed = Desired Charge Air Cooler Coolant Pump Speed
    • If not the specified state 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Verify the following conditions do not exist: M10 Charge Air Cooler Coolant Pump
    • Coolant = Correct level/Concentration Correct - Refer to: Charge Air Cooling System Draining and Filling
    • Leaking - Refer to: Loss of Coolant (LSY)
    • Motor - Stuck Off/Restricted/Binding or Sticking - Worn
    • Visible Damage
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Replace the component: M10 Charge Air Cooler Coolant Pump
    • Go to next step: If the specified state 
  4. Perform the scan tool control function: Charge Air Cooler Coolant Pump Speed - Command the component to the maximum position/speed

    Verify the scan tool parameter:

    • Charge Air Cooler Coolant Pump Communication Status = Okay
    • Charge Air Cooler Coolant Pump Supply Voltage Status = Okay
    • Charge Air Cooler Coolant Pump Internal Status = Okay
    • If not the specified state 

      Replace the component: M10 Charge Air Cooler Coolant Pump

    • Go to next step: If the specified state 
  5. Perform the scan tool control function: Charge Air Cooler Coolant Pump Speed - Command the component to the maximum position/speed

    Perform the action while monitoring the parameter: Charge Air Cooler Coolant Pump Speed

    • Wiggle the harness and connector: M10 Charge Air Cooler Coolant Pump - The value should not spike or drop out.
    • Wiggle the harness and connector: K20 Engine Control Module - The value should not spike or drop out.
    • If the value spikes or drops out 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the value does not spike or drop out 
  6. 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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  7. All OK.
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