Jeep XJ. Manual — part 829
Symptom List:
P0133-1/1 O2 SENSOR SLOW RESPONSE
P0139-1/2 O2 SENSOR SLOW RESPONSE
P0153-2/1 O2 SENSOR SLOW RESPONSE
P0159-2/2 O2 SENSOR SLOW RESPONSE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0133-1/1 O2 SENSOR SLOW
RESPONSE.
When Monitored and Set Condition:
P0133-1/1 O2 SENSOR SLOW RESPONSE
When Monitored:
With ECT greater than 147°F, after reaching a vehicle speed of 10 mph,
and the throttle remaining open (off idle) for 2 minutes, bring the vehicle to a stop and
allow the engine to idle with the transmission in DRIVE.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.27 volts to
above 0.62 volts and back fewer times than required.
P0139-1/2 O2 SENSOR SLOW RESPONSE
When Monitored:
Start engine. Allow engine to idle. For 1st part of test, if limits are
exceeded, test passes. If not, 2nd part of test runs. amb/batt temp >44°F, Baro >22.13
9
H2O, battery >10.5 volts, MAP >11.79 & <18.15
9 H2O, RPM >1350 & <2200 and vss >50
and <65.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.39 volts to
above 0.58 volts and back fewer times than required.
P0153-2/1 O2 SENSOR SLOW RESPONSE
When Monitored:
With ECT greater than 147°F, after reaching a vehicle speed of 10 mph,
and the throttle remaining open (off idle) for 2 minutes, bring the vehicle to a stop and
allow the engine to idle with the transmission in DRIVE.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.27 volts to
above 0.62 volts and back fewer times than required.
P0159-2/2 O2 SENSOR SLOW RESPONSE
When Monitored:
Start engine. Allow engine to idle. For 1st part of test, if limits are
exceeded, test passes. If not, 2nd part of test runs. amb/batt temp >44°F, Baro >22.13
9
H2O, battery >10.5 volts, MAP >11.79 & <18.15
9 H2O, RPM >1350 & <2200 and vss >50
and <65.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.39 volts to
above 0.58 volts and back fewer times than required.
77
DRIVEABILITY - GAS
POSSIBLE CAUSES
INTERMITTENT CONDITION
EXHAUST LEAK
O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP
O2 SENSOR GROUND CIRCUIT VOLTAGE DROP
O2 SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: Check for contaminates that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip counter displayed and equal to zero?
All
Yes
→
No
→
2
Start the engine.
Inspect the exhaust for leak between the engine and the O2 sensor.
Inspect the exhaust for leaks between the engine and the appropriate rear O2 Sensor.
Are there any exhaust leaks?
All
Yes
→
Repair or replace the leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
3
NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Backprobe between the O2 Sensor Signal circuit at the O2 Sensor harness connector
and PCM harness connector.
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair the high resistance on the O2 Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Backprobe between the O2 Sensor ground circuit at the O2 Sensor harness connector
and PCM harness connector.
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair the high resistance on the O2 Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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DRIVEABILITY - GAS
P0133-1/1 O2 SENSOR SLOW RESPONSE —
Continued
TEST
ACTION
APPLICABILITY
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the O2 Sensor
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
NOTE: Check for contaminates that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRBIII
t
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII
t Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
79
DRIVEABILITY - GAS
P0133-1/1 O2 SENSOR SLOW RESPONSE —
Continued
Symptom List:
P0135-1/1 O2 SENSOR HEATER FAILURE
P0141-1/2 O2 SENSOR HEATER FAILURE
P0155-2/1 O2 SENSOR HEATER FAILURE
P0161-2/2 O2 SENSOR HEATER FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0135-1/1 O2 SENSOR HEATER
FAILURE.
When Monitored and Set Condition:
P0135-1/1 O2 SENSOR HEATER FAILURE
When Monitored:
With battery voltage greater than 9 volts, at a cold start, ECT less than
147°F, battery temperature sensor equal to or less than 27°F, and engine at idle for at least
12 seconds.
Set Condition:
O2 sensor voltage greater than 3 volts for 30 to 90 seconds.
P0141-1/2 O2 SENSOR HEATER FAILURE
When Monitored:
With battery voltage greater than 9 volts, at a cold start, ECT less than
147°F, battery temperature sensor equal to or less than 27°F, and engine at idle for at least
12 seconds.
Set Condition:
O2 sensor voltage greater than 3 volts for 60 to 240 seconds.
P0155-2/1 O2 SENSOR HEATER FAILURE
When Monitored:
With battery voltage greater than 9 volts, at a cold start, ECT less than
147°F, battery temperature sensor equal to or less than 27°F, and engine at idle for at least
12 seconds.
Set Condition:
O2 sensor voltage greater than 3 volts for 30 to 90 seconds.
P0161-2/2 O2 SENSOR HEATER FAILURE
When Monitored:
With battery voltage greater than 9 volts, at a cold start, ECT less than
147°F, battery temperature sensor equal to or less than 27°F, and engine at idle for at least
12 seconds.
Set Condition:
O2 sensor voltage greater than 3 volts for 30 to 90 seconds.
POSSIBLE CAUSES
O2 HEATER ELEMENT
O2 SENSOR HEATER GROUND CIRCUIT OPEN
O2 HEATER RELAY OUTPUT CIRCUIT OPEN
80
DRIVEABILITY - GAS
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