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 appropriate electrical connector: @ K20 Engine Control Module
2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 1 @ Component harness & The other end of the circuit @ 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 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 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ 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 & The other end of the circuit @ 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 & The other end of the circuit @ 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:
- Coolant consumption. Refer to Loss of Coolant (LGY) , or Loss of Coolant (LSY)
- Exhaust System - Leaking
- Fuel - Contaminated/Poor Quality - Refer to Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel Pressure - High/Low - 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: B52 Heated Oxygen Sensor
Perform the scan tool configuration/reset function: Heated Oxygen Sensor Heater Resistance Learned Values 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.