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
Verify there are no DTCs set related to the following component/system:
- B34 Engine Coolant Temperature Sensor
- B52 Heated Oxygen Sensor
- B65 Manifold Absolute Pressure and Intake Air Temperature Sensor
- B75 Mass Airflow Sensor
- Q17 Fuel Injector
- Q38 Throttle Body
- Engine Misfire
- Fuel Trim System
- If a related DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If a related DTC is not set
Verify the following conditions do not exist:
- Coolant consumption - Refer to: Loss of Coolant (LSY)
- Oil consumption - Refer to: Oil Consumption Diagnosis
- If a condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Verify a condition does not exist with the component: B52 Heated Oxygen Sensor - Loose/Poor Connection/Visible Damage
- If a condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Verify a condition does not exist with the component: Exhaust System & Three-Way Catalytic Converter
- Cracked
- Internal component rattle
- Leaking - Refer to: Exhaust Leakage
- Loose Clamps
- Missing components
- Restrictions - Refer to: Restricted Exhaust
- Severe discoloration caused by excessive temperatures
- Visible Damage
- If a condition exists
  Repair or replace as necessary
- Go to next step: If no condition exists
Replace the component: Catalytic Converter