Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: B52 Heated Oxygen Sensor
Disconnect the electrical connector: K20 Engine Control Module
Test for less than 2 ohms between the test points: Low Reference circuit terminal 1@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
Test for infinite resistance between the test points: Signal circuit terminal 2@Component harness & Ground
- If less than infinite resistance
  Repair the short to ground on the circuit:
- Go to next step: If infinite resistance
Ignition - On/Vehicle - In Service Mode
Test for less than 1 V between the test points: Signal circuit terminal 2@Component harness & Ground
- If 1 V or greater
  Repair the short to voltage on the circuit:
- Go to next step: If less than 1 V
Ignition/Vehicle - Off
Test for less than 2 ohms between the test points: Signal circuit terminal 2@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
Test for infinite resistance between the test points: Signal circuit terminal 3@Component harness & Ground
- If less than infinite resistance
  Repair the short to ground on the circuit:
- Go to next step: If infinite resistance
Ignition - On/Vehicle - In Service Mode
Test for less than 1 V between the test points: Signal circuit terminal 3@Component harness & Ground
- If 1 V or greater
  Repair the short to voltage on the circuit:
- Go to next step: If less than 1 V
Ignition/Vehicle - Off
Test for less than 2 ohms between the test points: Signal circuit terminal 3@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
Test for infinite resistance between the test points: Signal circuit terminal 7@Component harness & Ground
- If less than infinite resistance
  Repair the short to ground on the circuit:
- Go to next step: If infinite resistance
Ignition - On/Vehicle - In Service Mode
Test for less than 1 V between the test points: Signal circuit terminal 7@Component harness & Ground
- If 1 V or greater
  Repair the short to voltage on the circuit:
- Go to next step: If less than 1 V
Ignition/Vehicle - Off
Test for less than 2 ohms between the test points: Signal circuit terminal 7@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
Verify none of the conditions listed below exist:
- Water intrusion in the following components or their wiring harnesses: B52 Heated Oxygen Sensor
- Fuel pressure low or high.Refer to: Fuel System Diagnosis
- Contaminated or poor quality fuel.Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks
- Engine vacuum leaks.
- Oil consumptionRefer to: Oil Consumption Diagnosis
- Coolant consumptionRefer to: Loss of Coolant
- If a condition exists
  Repair as necessary
- Go to next step: If no conditions exist
Test or replace the component: B52A Heated Oxygen Sensor 1
Perform the scan tool configuration/reset function: HO2S Heater Resistance Reset
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
  Test or replace the component: K20 Engine Control Module
- Go to next step: If the DTC is not set
All OK.