Circuit/System Testing

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

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:B52 Heated Oxygen Sensor
Test for less than 10 Ω between the test points:Low Reference circuit terminal 1 & Ground
- If 10 Ω or greater
1. Disconnect the electrical connector:K20 Engine Control Module
2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 1 @ Component harness & Terminal X3 38 @ Control module harness
  - If 2 Ω or greater - Repair the open/high resistance in the circuit.
  - If less than 2 Ω - Test or replace the component: K20 Engine Control Module
- Go to next step: If less than 10 Ω
Disconnect the electrical connector:K20 Engine Control Module
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 Ω between the test points:Signal circuit terminal 2 @ Component harness & Terminal X3 36 @ Control module harness
- If 2 Ω or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
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 Ω between the test points:Signal circuit terminal 3 @ Component harness & Terminal X3 37 @ Control module harness
- If 2 Ω or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
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 Ω between the test points:Signal circuit terminal 7 @ Component harness & Terminal X3 35 @ Control module harness
- If 2 Ω or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω
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 consumption Refer to Oil Consumption Diagnosis
- Coolant consumption Refer 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.