(P0135) 02 Sensor 1/1 Heater Performance

(P0135) 02 SENSOR 1/1 HEATER PERFORMANCE






When Monitored and Set Condition
^ When Monitored: Engine Running and Heater duty cycle greater than 0%.
^ Set Condition: 02 Heater Temperature does not reach 575 °C (959 °F) within 90 second during monitoring conditions. Two Trip Fault.

POSSIBLE CAUSES
02 SENSOR HEATER FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN
02 SENSOR HEATER CONTROL CIRCUIT SHORT TO VOLTAGE
02 SENSOR HEATER CONTROL CIRCUIT SHORT TO GROUND
02 HEATER CONTROL CIRCUIT OPEN 02 HEATER ELEMENT
POWERTRAIN CONTROL MODULE

Diagnostic Test
1. CHECK FOR CURRENT DTC





Note: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB III at the same time the DTC is displayed.

Note: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Turn the ignition on.
With the DRB III, erase PCM DTCs.

Note: It maybe necessary to road test the vehicle for this DTC to set. With the DRB III, read the PCM DTCs.

Did this DTC set again?
Yes>> Go To 2
No>> Go To 7

2. PCM





Turn the ignition off. Disconnect the PCM harness connectors.

Note: Check connectors-Clean/repair as necessary. Turn the ignition on. Measure the voltage of the 02 Sensor Heater Control circuit at the PCM harness connector.

Is the voltage above 10 volts?
Yes>> Replace and program the Powertrain Control Module.
Perform Powertrain Verification Test - Ver 2
No>> Go To 3

3. 02 SENSOR HEATER CONTROL CIRCUIT SHORT TO GROUND





Turn the ignition off.
Disconnect the 02 Sensor harness connector.

Note: Check connectors-Clean/repair as necessary. Measure the resistance between ground and the 02 Sensor Heater Control circuit.

Is resistance below 100 ohms?
Yes>> Repair the 02 Sensor Heater Control circuit for a short to ground.
Perform Powertrain Verification Test - Ver 2
No>> Go To 4

4. 02 SENSOR HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE





Turn the ignition on.
Measure the voltage of the 02 Sensor Heater Control circuit at the 02
Sensor harness connector.
Is the voltage above 1.0 volts?
Yes>> Repair the 02 Sensor Heater Control circuit for a short to voltage.
Perform Powertrain Verification Test - Ver 2
No>> Go To 5

5. 02 SENSOR HEATER CONTROL CIRCUIT OPEN





Turn the ignition off.
Measure the resistance of the 02 Sensor Heater Control circuit from
the 02 Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes>> Go To 6
No>> Repair the 02 Sensor Heater Control circuit for an open.
Perform Powertrain Verification Test - Ver 2

6. 02 SENSOR HEATER FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT





Turn the ignition on.
Measure the voltage of the 02 Sensor Heater Fused Engine Control Relay Output circuit at the 02 Sensor harness connector.
Is the voltage above 10 volts?
Yes>> Replace the 02 Sensor.
Perform Powertrain Verification Test - Ver 2
No>> Repair the 02 Sensor Heater Fused Engine Control Relay Output circuit for an open.
Perform Powertrain Verification Test - Ver 2

7. INTERMITTENT WIRING AND CONNECTORS
The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.

Note: Check connectors-Clean/repair as necessary. Poor pin to terminal connections can set DTC's.

Note: Check for any Technical Service Bulletins that may apply. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.

Were there any problems found?
Yes>> Repair as necessary.
Perform Powertrain Verification Test - Ver 2
No>> The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.