Jeep XJ. Manual — part 847
Symptom List:
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR
P1196-2/1 O2 SENSOR SLOW DURING CATALYST MONITOR
P1197-1/2 O2 SENSOR SLOW DURING CATALYST MONITOR
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1195-1/1 O2 SENSOR SLOW
DURING CATALYST MONITOR.
When Monitored and Set Condition:
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR
When Monitored:
With the engine running, coolant greater than 170°F, open throttle,
steady to slightly increasing vehicle speed greater than 18 mph but less than 55 mph, with
a light load on the engine, for a period no less than 5 minutes.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.39 volt to
above 0.6 volts and back fewer times than required.
P1196-2/1 O2 SENSOR SLOW DURING CATALYST MONITOR
When Monitored:
With the engine running, coolant greater than 170°F, open throttle,
steady to slightly increasing vehicle speed greater than 18 mph but less than 55 mph, with
a light load on the engine, for a period no less than 5 minutes.
Set Condition:
The oxygen sensor signal voltage is switching from below 0.39 volt to
above 0.6 volts and back fewer times than required.
POSSIBLE CAUSES
O2S SENSOR GROUND CIRCUIT VOLTAGE DROP
O2S SIGNAL CIRCUIT VOLTAGE DROP
EXHAUST LEAK
EXCESSIVE ENGINE BLOW BY
O2S HEATER FEED CIRCUIT OPEN
O2S HEATER GROUND CIRCUIT OPEN
WIRING HARNESS INTERMITTENT PROBLEM
O2 SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→
No
→
149
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
2
Turn the ignition on.
With the DRBIII
t, actuate the O2 HEATER TEST.
Monitor the O2 Sensor voltage on the DRBIII
t. (O2S voltage should drop below 1.5
volts within 2-3 minutes)
Does the DRBIII
t O2 Sensor voltage drop below 1.5 volts within 2-3 minutes during
the O2 HEATER TEST
All
Yes
→
No
→
3
Start the engine and allow engine to idle.
Check for any exhaust leaks between the engine and the appropriate O2S.
Check for exhaust leaks between the engine and the appropriate downstream O2
Sensor.
Are there any exhaust leaks?
All
Yes
→
Repair or replace leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Start engine. Allow the engine to reach normal operating temperature.
Check the exhaust for excessive smoke from internal oil or coolant leaks.
Is there an oil or coolant consumption condition present?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Ground circuit between the O2 sensor
harness connector and the PCM harness connector. Connect Voltmeter for positive
polarity.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair high resistance on O2S Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Signal circuit between the O2 Sensor
harness connector and PCM harness connector.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair high resistance on O2S Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
150
DRIVEABILITY - GAS
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the PCM harness connector(s).
Turn the ignition on.
With the DRBIII
t actuate the O2 HEATER TEST. Measure the voltage at the O2
sensor harness connector Heater Feed circuit.
Is the voltage above 11.0 volts?
All
No
→
Repair the OPEN circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Yes
→
8
Turn the ignition off.
Disconnect the O2 sensor harness connector.
Measure the resistance between the O2S Heater ground circuit and Engine Ground.
Is the resistance below 5.0 ohms?
All
No
→
Repair the OPEN circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Yes
→
9
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Signal circuit between the O2 Sensor
harness connector and PCM harness connector.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair high resistance on O2S Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Ground circuit between the O2 sensor
harness connector and the PCM harness connector. Connect Voltmeter for positive
polarity.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair high resistance on O2S Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
Start the engine and allow engine to idle.
Check for any exhaust leaks between the engine and the appropriate O2S.
Check for exhaust leaks between the engine and the appropriate downstream O2
Sensor.
Are there any exhaust leaks?
All
Yes
→
Repair or replace leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
151
DRIVEABILITY - GAS
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR —
Continued
TEST
ACTION
APPLICABILITY
12
Start engine. Allow the engine to reach normal operating temperature.
Check the exhaust for excessive smoke from internal oil or coolant leaks.
Is there an oil or coolant consumption condition present?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
13
If there are no potential causes remaining, view repair.
All
Repair
Replace the O2S.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
14
Start the engine and allow engine to idle.
Check for any exhaust leaks between the engine and the appropriate O2S.
Check for exhaust leaks between the engine and the appropriate downstream O2
Sensor.
Are there any exhaust leaks?
All
Yes
→
Repair or replace leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
15
Start engine. Allow the engine to reach normal operating temperature.
Check the exhaust for excessive smoke from internal oil or coolant leaks.
Is there an oil or coolant consumption condition present?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
16
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
152
DRIVEABILITY - GAS
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR —
Continued
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