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.

NOTE:

This procedure uses generic scan tool control functions and parameter names.For detailed scan tool information, refer to: Diagnostic Aids
For component location, refer to: Diagnostic Aids or Repair Instructions

Engine - Idling - At normal operating temperature
Verify the appropriate scan tool parameter:
- Heated Oxygen Sensor Heater Control Circuit High Test Status = Not Run or Okay
- Heated Oxygen Sensor Heater Control Circuit Low Test Status = Not Run or Okay
- Heated Oxygen Sensor Heater Control Circuit Open Test Status = Not Run or Okay
- If not the specified state
  Refer to: Circuit/System Testing
- Go to next step: If the specified state
Verify the appropriate scan tool parameter: Heated Oxygen Sensor Heater = 0.3 to 2.9 A
- If not in the specified range
  Refer to: Circuit/System Testing
- Go to next step: If within the specified range
Verify the appropriate scan tool parameter: Heated Oxygen Sensor Heater = The parameter value should not change
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B52 Heated Oxygen Sensor
- Wiggle the harness and connector: K20 Engine Control Module
- If the parameter value changes
  Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)
- Go to next step: If the parameter value does not change
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.