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.

Ignition - On / Vehicle - In Service Mode

NOTE:

This step only applies to the following component DTCs: Q97B Engine Coolant Flow Control Valve - Block

Verify DTC P118A, P11C9, P1387, P26C0, P26C2, P2DE8, P2E81, U111A, U1348, U1379 is not set.
- If DTC U111A, U1348 is set and other DTCs are set
  Refer to:DTC U1345-U1349
- If DTC U111A and one or more of the DTCs P118A, P11C9, P1387, P26C0, P26C2, P2DE8, P2E81, U1379 is set
  Refer to: Circuit/System Testing
- If DTC P118A, P11C9, P1387, P26C0, P26C2, P2DE8, P2E81, U1379 is set and no other DTCs are set
  Replace the component: Q97B Engine Coolant Flow Control Valve - Block
- Go to next step: If none of the DTCs are set
Perform the scan tool control function: Engine Block Coolant Control Valve Position - Increase & Decrease
Verify the scan tool parameter: Engine Block Coolant Control Valve Position = The value should not spike or drop out.
- Perform the action while monitoring the parameter:
- Wiggle the harness and connector: Q97B Engine Coolant Flow Control Valve - Block
- Wiggle the harness and connector: K20 Engine Control Module
- 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
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
All OK.