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 ohms between the test points: Low Reference circuit terminal 1 & Ground
- If 10 ohms or greater
1. Disconnect the appropriate electrical connector: K20 Engine Control Module
2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 1 @ Component harness & Terminal X2 32 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Test or replace the component: K20 Engine Control Module
- Go to next step: If less than 10 ohms
Disconnect the appropriate 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 ohms between the test points: Signal circuit terminal 2 @ Component harness & Terminal X2 31 @ 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 & Terminal X2 46 @ 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 & Terminal X2 45 @ 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:
- Coolant consumption Refer to: Loss of Coolant (LSY)
- EVAP System - Saturated with fuel
- Exhaust System - Leaking/Missing components/Restricted - Refer to: Exhaust Leakage
- Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel pressure that is too low or too high. - Refer to: Fuel System Diagnosis
- Oil consumption Refer to: Oil Consumption Diagnosis
- Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
- Water intrusion in the following components or their wiring harnesses: B52 Heated Oxygen Sensor
- 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
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.