P0135-O2 SENSOR 1/1 HEATER PERFORMANCE
For a complete wiring diagram Refer to Section 8W
Possible Causes
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INTERMITTENT DTC
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(K79) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
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(K79) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
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(K79) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
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(F344) FUSED ASD RELAY OUTPUT 2 CIRCUIT OPEN OR HIGH RESISTANCE
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OXYGEN SENSOR
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ENGINE CONTROL MODULE (ECM)
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the Oxygen Sensor Heater.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
No
2.
(K79) 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 theTIPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.
Turn the ignition on.
Measure the voltage of the (K79) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.
Is there any voltage present?
Yes
No
3.
(K79) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Remove the jumper wire and install the ASD Relay..
Measure the resistance between ground and the (K79) O2 1/1 Heater Control circuit in the Oxygen Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
No
4.
(K79) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K79) 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
No
5.
(F344) FUSED ASD RELAY OUTPUT 2 CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (F344) Fused ASD Relay Output 2 circuit between the Oxygen Sensor harness connector and the ASD Relay connector.
Is the resistance below 10.0 ohms?
Yes
No
6.
OXYGEN SENSOR
Connect the Engine Control Module (ECM) harness connector.
Replace the Oxygen Sensor in accordance with the Service Information.
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
No
7.
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
No