P0136

P0136-O2 SENSOR 1/2 CIRCUIT





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Engine running, oxygen sensor at operating temperature (light-off time is 10 seconds), battery voltage between 11.0 and 16.0 volts.

- Set Condition:
The oxygen sensor signal voltage is greater than 2.20 volts for a calibrated period of time. Two Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. O2 SENSOR BELOW 2.52 VOLTS
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With a scan tool, read the 1/2 O2 Sensor voltage.

Is the voltage below 2.52 volts?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Checking for an Intermittent DTC.

2. (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT




1. Turn the ignition off.
2. Disconnect the 1/2 O2 Sensor harness connector.
3. Ignition on, engine not running.
4. With a scan tool, monitor the O2 Sensor voltage.

Is the 1/2 O2 Sensor voltage above 4.8 volts?

Yes

- Go To 3

No

- Go To 5

3. O2 SENSOR




1. Measure the voltage on the (K904) O2 Return Downstream circuit in the O2 Sensor harness connector.

Is the voltage at 2.5 volts?

Yes

- Replace the O2 Sensor.
- Perform the PCM Verification Test.PCM Verification Test.

No

- Go To 4

4. (K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the C1 PCM harness connector.
3. Measure the resistance between ground and the (K904) O2 Return Downstream circuit in the O2 Sensor harness connector.

Is the resistance below 100 Ohms?

Yes

- Repair the short to ground in the (K904) O2 Return Downstream circuit.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Go To 7

5. (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the C1 PCM harness connector.
3. Measure the resistance between ground and the (K141) O2 Sensor 1/2 Signal circuit in the O2 Sensor harness connector.

Is the resistance below 100 Ohms?

Yes

- Repair the short to ground in the (K141) O2 Sensor 1/2 Signal circuit.
- Perform the PCM Verification Test.PCM Verification Test.

No

- Go To 6

6. (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 RETURN DOWNSTREAM CIRCUIT




1. Measure the resistance between the (K141) O2 Sensor 1/2 Signal circuit and the (K904) O2 Return Downstream circuit in the O2 Sensor harness connector.

Is the resistance below 100 Ohms?

Yes

- Repair the short between the (K904) O2 Return Downstream circuit and the (K141) O2 Sensor 1/2 Signal circuit.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Go To 7

7. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the PCM Verification Test. PCM Verification Test.