P0032

P0032 - O2 SENSOR 1/1 HEATER CIRCUIT HIGH





For a complete wiring diagram refer to Diagrams/Electrical

- When Monitored:

With the ignition on and the Oxygen Sensor Heater command on.

- Set Condition:

The ECM detects that the (K99) O2 1/1 Heater Control circuit is shorted to voltage for 2.0 seconds.






Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. DTC IS ACTIVE

Ignition on, engine not running.

With the scan tool, Clear DTCs in the Engine Control Module (ECM).

Start the engine and allow it to reach normal operating temperature.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC

2. (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE





Turn the ignition off.

Disconnect the Oxygen Sensor harness connector.

Disconnect the Engine Control Module (ECM) harness connector.

Remove the ASD Relay from the PDC.

Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.

Turn the ignition on.

Measure the voltage of the (K99) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.

Is there any voltage present?

Yes

- Repair the (K99) O2 1/1 Heater Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1. ECM Verification Test

No

- Go to 3

3. (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO THE (A15) FUSED ASD RELAY OUTPUT CIRCUIT





Turn the ignition off.

Remove the jumper wire and install the ASD relay.

Measure the resistance between the (K99) O2 1/1 Heater Control circuit and the (A15) Fused ASD Relay Output in the Oxygen Sensor harness connector.

Is the resistance above 10.0 ohms?

Yes

- Go to 4

No

- Repair the (K99) O2 1/1 Heater Control circuit for a short to the (A15) Fused ASD Relay Output circuit.
- Perform the ECM Verification Test Ver. 1. ECM Verification Test

4. (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE





Measure the resistance of the (K99) O2 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the Engine Control Module (ECM) harness connector.

Is the resistance below 10.0 ohms?

Yes

- Go to 5

No

- Repair the (K99) O2 1/1 Heater Control circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. ECM Verification Test

5. OXYGEN SENSOR

Connect the Engine Control Module (ECM) harness connector.

Replace the Oxygen Sensor.

Turn the ignition on.

With the scan tool, Clear DTCs.

Start the engine and allow it to reach normal operating temperature.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go to 6

No

- Test Complete.
- Perform the ECM Verification Test Ver. 1. ECM Verification Test

6. ENGINE CONTROL MODULE (ECM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Engine Control Module (ECM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. ECM Verification Test

No

- Replace the Engine Control Module (ECM).
- Perform the ECM Verification Test Ver. 1. ECM Verification Test