Nissan Altima L32. Instruction — part 275
P0138 HO2S2
EC-221
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO-1 >> With CONSULT-III: GO TO 3.
NO-2 >> Without CONSULT-III: GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°C (32 to 86 °F).
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that “COOLAN TEMP/S” indicates more than 70
°C (158°F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70
°C (158°F).
7. Open engine hood.
8. Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.
9. Follow the instruction of CONSULT-III.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III
OK
>> INSPECTION END
NG
>> Go to
CAN NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALUNCTION B AGAIN
1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2. Perform DTC CONFIRMATION PROCEDURE again.
>> GO TO 3.
5.
PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
Perform component function check. Refer to
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000004349269
1.
PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT-III
1. Start engine and warm it up to the normal operating temperature.
EC-222
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0138 HO2S2
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000004349270
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 9.
2.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
ECM
Ground
Condition
Voltage
Connector
Terminal
F13
33
(HO2S2
signal)
Ground
Revving up to 4,000
rpm under no load
at least 10 times
The voltage should be
above 0.18 V at least
once during this proce-
dure.
JMBIA1586ZZ
ECM
Ground
Condition
Voltage
Connector
Terminal
F13
33
(HO2S2
signal)
Ground
Keeping engine
speed at idle for
10 minutes
The voltage should be
above 0.18 V at least once
during this procedure.
JMBIA1587ZZ
ECM
Ground
Condition
Voltage
Connector
Terminal
F13
33
(HO2S2
signal)
Ground
Coasting from 80 km/h
(50 MPH) in D position
(CVT), 4th gear posi-
tion (M/T)
The voltage should
be above 0.18 V at
least once during
this procedure.
JMBIA1588ZZ
P0138 HO2S2
EC-223
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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YES
>> GO TO 3.
NO
>> Repair or replace ground connection.
3.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between HO2S2 harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 2
EC-225, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using oxygen sensor thread cleaner
[commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial
service tool).
HO2S2
ECM
Continuity
Connector Terminal Connector Terminal
F42
1
F13
35
Existed
HO2S2
ECM
Continuity
Connector Terminal Connector Terminal
F42
4
F13
33
Existed
HO2S2
ECM
Ground
Continuity
Connector Terminal Connector Terminal
F42
4
F13
33
Ground Not existed
Water should not exist.
EC-224
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0138 HO2S2
>> INSPECTION END
8.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
9.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace ground connection.
10.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to
EC-32, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement"
.
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0172. Refer to
.
NO
>> GO TO 11.
11.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between HO2S2 harness connector and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK HEATED OXYGEN SENSOR 2
HO2S2
ECM
Continuity
Connector Terminal Connector Terminal
F42
1
F13
35
Existed
HO2S2
ECM
Continuity
Connector Terminal Connector Terminal
F42
4
F13
33
Existed
HO2S2
ECM
Ground
Continuity
Connector Terminal Connector Terminal
F42
4
F13
33
Ground Not existed
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