Jeep Wrangler TJ. Manual — part 93
POSSIBLE CAUSES
EXHAUST LEAK
O2 SIGNAL CIRCUIT
O2 RETURN CIRCUIT
O2 SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: Check for contaminants that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
Ignition on, engine not running.
NOTE: After the repairs have been made, verify proper O2 Sensor operation.
If all the O2 Sensor voltage readings have not returned to normal, follow the
diagnostic procedure for the remaining O2 Sensors.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Start the engine.
Inspect the exhaust system for leaks between the engine and the O2 Sensors.
Are there any exhaust leaks?
All
Yes
→ Repair or replace the leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
3
Turn the ignition off
Disconnect the O2 Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the O2 Signal circuit in the O2 Sensor harness connector.
Is the voltage between 4.5 and 5.0 volts?
All
Yes
→ Go To 4
No
→ Check the O2 Signal circuit for damage, short to ground, open, or
short to voltage. If OK, replace and program the Powertrain
Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Measure the voltage on the O2 Return circuit in the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
All
Yes
→ Check the O2 Return circuit for damage, short to ground, open, or
short to voltage. If OK, replace and program the Powertrain
Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the O2 Sensor
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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DRIVEABILITY - NGC
P0133-O2 SENSOR 1/1 SLOW RESPONSE —
Continued
Symptom List:
P0135-O2 SENSOR 1/1 HEATER PERFORMANCE
P0141-O2 SENSOR 1/2 HEATER PERFROMANCE
P0155-O2 SENSOR 2/1 HEATER PERFORMANCE
P0161-O2 SENSOR 2/2 HEATER PERFORMANCE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0135-O2 SENSOR 1/1 HEATER
PERFORMANCE.
When Monitored and Set Condition:
P0135-O2 SENSOR 1/1 HEATER PERFORMANCE
When Monitored:
Engine running and heater duty cycle greater than 0%. ASD Relay is
energized. Battery voltage greater than 10.4 volts.
Set Condition:
No sensor output is received when the PCM powers up the sensor heater.
O2 heater is out of control for 128 seconds after it has reached 300 deg C. Two trip fault
P0141-O2 SENSOR 1/2 HEATER PERFROMANCE
When Monitored:
Engine running and heater duty cycle greater than 0%. ASD Relay is
energized. Battery voltage greater than 10.4 volts.
Set Condition:
No sensor output is received when the PCM powers up the sensor heater.
O2 heater is out of control for 128 seconds after it has reached 350 deg C. Two trip fault.
P0155-O2 SENSOR 2/1 HEATER PERFORMANCE
When Monitored:
Engine running and heater duty cycle greater than 0%. ASD Relay is
energized. Battery voltage greater than 10.4 volts.
Set Condition:
No sensor output is received when the PCM powers up the sensor heater.
O2 heater is out of control for 128 seconds after it has reached 300 deg C. Two trip fault.
P0161-O2 SENSOR 2/2 HEATER PERFORMANCE
When Monitored:
Engine running and heater duty cycle greater than 0%. ASD Relay is
energized. Battery voltage greater than 10.4 volts.
Set Condition:
No sensor output is received when the PCM powers up the sensor heater.
O2 heater is out of control for 128 seconds after it has reached 350 deg C. Two trip fault.
POSSIBLE CAUSES
O2 SENSOR HEATER OPERATION
O2 HEATER ELEMENT
O2 HEATER CONTROL CIRCUIT OPEN
O2 HEATER GROUND CIRCUIT OPEN
98
DRIVEABILITY - NGC
POSSIBLE CAUSES
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down
before continuing the test. Allow the O2 Sensor voltage to stabilize between
4.6 and 5.0 volts.
Ignition on, engine not running.
With the DRBIII
t, actuate the O2 Heater Test.
With the DRBIII
t, monitor O2 Sensor voltage for at least 2 minutes.
Does the voltage stay above 4.5 volts?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down to room temperature.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element component side.
Is the resistance between 2.0 and 30 ohms?
All
Yes
→ Go To 3
No
→ Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
3
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the O2 Heater Control circuit from the O2 Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 0.5 of an ohm?
All
Yes
→ Go To 4
No
→ Repair the excessive resistance in the O2 Heater Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Measure the resistance between an engine ground and the O2 Heater ground circuit
at the O2 Sensor harness connector.
Is the resistance below 0.5 of an ohm?
All
Yes
→ Go To 5
No
→ Repair the excessive resistance in the O2 Heater ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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DRIVEABILITY - NGC
P0135-O2 SENSOR 1/1 HEATER PERFORMANCE —
Continued
TEST
ACTION
APPLICABILITY
5
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
100
DRIVEABILITY - NGC
P0135-O2 SENSOR 1/1 HEATER PERFORMANCE —
Continued
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