P2246

P2246-O2 SENSOR 1/1 REFERENCE VOLTAGE CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on and the O2 1/1 Sensor at operating temperature.

- Set Condition:
The ECM detects a short to voltage on the (K41) O2 1/1 Reference Signal circuit for 2.0 seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

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.
Allow the engine to reach normal operating temperature.
Monitor the scan tool for at least two minutes.
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.Intermittent Condition

2. (K41) O2 1/1 REFERENCE SIGNAL 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 (K41) O2 1/1 Reference Signal circuit in the Oxygen Sensor harness connector.
Is there any voltage present?

Yes

- Repair the (K41) O2 1/1 Reference Signal circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Go to 3

3. (K41) O2 1/1 REFERENCE SIGNAL 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 (K41) O2 1/1 Reference Signal circuit and the (A15) Fused ASD Relay Output circuit in the Oxygen Sensor harness connector.
Is the resistance above 10.0 ohms?

Yes

- Go to 4

No

- Repair the (K41) O2 1/1 Reference Signal circuit for a short to the (A15) Fused ASD Relay Output circuit.
- Perform the ECM Verification Test Ver. 1. Verification Tests

4. (K41) O2 1/1 REFERENCE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE




Measure the resistance of the (K41) O2 1/1 Reference Signal 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 circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

5. OXYGEN SENSOR
Connect the Engine Control Module (ECM) connector.
Replace the Oxygen Sensor.
Start the engine.
Allow the engine to reach normal operating temperature.
Monitor the scan tool for at least two minutes.
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. Verification Tests

6. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors 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.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

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

No

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