LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 399 (Engine Cooling System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P26CE, P2B85, P2BA2, P2DE9, P2E82, P3071-P3076, U0672, or U131B >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Verify the following conditions do not exist:
    • Incorrect fluid level or condition - Coolant @ Surge Tank - Refer to: Loss of Coolant (LSY) , or Loss of Coolant (LT4) , or Loss of Coolant (LGY) 
    • Antifreeze Concentration - Incorrect
    • G59 Engine Coolant Pump - Abnormal noise /Leaking/Stuck On/Visible Damage
    • Hoses / Lines @ Cooling System - Leaking/Loose Clamps/Visible Damage
    • Hoses / Lines @ G59 Engine Coolant Pump - Leaking/Loose Clamps/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify DTC U0672, U1348 is not set.
    • If DTC U0672, U1348 is set and other DTCs are set 

      Refer to: DTC U1345-U1349

    • If DTC U0672 is set and no other DTCs are set 

      Refer to: Circuit/System Testing

    • Go to next step: If none of the DTCs are set 
  5. Verify DTC U131B is not set and no other DTCs are set.
    • If DTC U131B is set and no other DTCs are set 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If the DTC is not set 
  6. Verify DTC P26CE, P2B85, P2BA2, P2DE9, P2E82, P3071, P3072, P3073, P3074 is not set.
    • If any of the DTCs are set 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If none of the DTCs are set 
    7. NOTE:

    If the system has recently been serviced, it is possible that air is trapped in the system causing the condition or a DTC to set.

  7. Verify DTC P3075, P3076 is not set.
    • If any of the DTCs are set 
    1. Engine - Idling - At normal operating temperature.
      2. NOTE:

      For this test, the action may need to be repeated several times.

    2. Perform the following procedure/test: Engine Coolant Fill - Refer to: Cooling System Draining and Filling (LSY GE 47716) , or Cooling System Draining and Filling (LSY Static Fill) , or Cooling System Draining and Filling (LGY Static Fill) , or Cooling System Draining and Filling (LGY GE 47716) , or Cooling System Draining and Filling (LT4 Static Fill) , or Cooling System Draining and Filling (LT4 GE 47716)

      Verify the condition does not exist: Fill Level = Low @ Surge Tank

      • If a condition exists - Repair as necessary
      • Go to next step: If no condition exists
    3. Replace the component: G59 Engine Coolant Pump
    • Go to next step: If none of the DTCs are set 
  8. Engine - Idling - At normal operating temperature.
  9. Verify the scan tool parameter:
    • Engine Coolant Pump Internal Status = Okay
    • Engine Coolant Pump Stalled = No
    • If not the specified state 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If the specified state 
  10. Verify the scan tool parameter: Desired Engine Coolant Pump Speed = Engine Coolant Pump Speed
    • If not equal 

      Refer to: Circuit/System Testing

    • Go to next step: If equal 
  11. Verify the scan tool parameter: Engine Coolant Pump Supply Voltage Status = Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  12. Verify the scan tool parameter: Engine Coolant Pump Dry = No
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Perform the following procedure/test: Cooling System Leak Testing 

      Verify the procedure/test passes.

      • If the procedure/test does not pass - Repair or replace as necessary
      • Go to next step: If the procedure/test passes
    3. Replace the component: G59 Engine Coolant Pump
    • Go to next step: If the specified state 
  13. Perform the scan tool control function: Engine Coolant Pump - Command the component to the maximum position/speed

    Verify the scan tool parameter: Engine Coolant Pump Current = 0.6 to 79 A

    • If not between 0.6 and 79 A 

      Refer to: Circuit/System Testing

    • Go to next step: If between 0.6 and 79 A 
  14. Verify the scan tool parameter: Engine Coolant Pump Overtemperature = No
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Verify the component location is free of debris, clutter or any obstruction that may reduce airflow which could cause an overheat condition: G59 Engine Coolant Pump
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Replace the component: G59 Engine Coolant Pump
    • Go to next step: If the specified state 
  15. Perform the scan tool control function: Engine Coolant Pump - Command the component to the maximum position/speed

    Verify a condition does not exist with the component: G59 Engine Coolant Pump - Turns Off

    Perform the action while monitoring the component:

    • Wiggle the harness and connector: G59 Engine Coolant Pump
    • Wiggle the harness and connector: K20 Engine Control Module
    • If a condition exists 

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

    • Go to next step: If no condition exists 
  16. 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 
  17. All OK.
scientia non olet · About LEMON Manuals