Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Verify the following conditions do not exist:NOTE: Step 1 and 2 only needs performed if P0133 or P11A6 is set.
- Induction system leaks - Refer to Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Air Leak Test) , Charge Air Cooler Diagnosis (Induction System Smoke Test) and Charge Air Cooler Diagnosis .
- Exhaust system leaks - Refer to Exhaust Leakage .
- A loose or disconnected charge air cooler hose or pipe.
- If a condition is found
Repair the intake or exhaust system
- If no condition is found
- Remove the B52 Heated Oxygen Sensor and inspect sensor element for excessive soot build-up.
- If excessive soot build-up is present
Replace the B52 Heated Oxygen Sensor
- If excessive soot build-up is not present
- If excessive soot build-up is present
- Ignition Off and all vehicle systems Off, disconnect the harness connector at the B52 Heated Oxygen Sensor. It may take up to 2 min for all vehicle systems to power down.
- Ignition On.
- Test for 300-600 mV between the B52 Heated Oxygen Sensor signal circuit terminal 1 and ground.NOTE: The millivolt scale on the DMM must be used for this step to ensure an accurate reading.
- If not greater than 300 mV
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
- Test for infinite resistance between the sensor signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω in the sensor signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- If greater than 600 mV
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
- Test for less than 100 mV between the sensor signal circuit and ground.
- If 100 mV or greater, repair the short to voltage on the circuit.
- If less than 100 mV, replace the K20 Engine Control Module.
- If between 300-600 mV
- Test for 2.8-3.2 V between the B52 Heated Oxygen Sensor control circuit terminal 6 and ground.
- If less than 2.8 V
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω in the Sensor control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- If greater than 3.2 V
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 2.8-3.2 V
- Test for 2.4-2.8 V between the B52 Heated Oxygen Sensor low reference circuit terminal 2 and ground.
- If less than 2.4 V
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
- Test for infinite resistance between the low reference circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω in the Sensor low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- If greater than 2.8 V
- Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
- Test for less than 1 V between the low reference circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 2.4-2.8 V
- Replace the B52 Heated Oxygen Sensor.