Nissan Maxima. Manual — part 437
EC-232
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0137, P0157 HO2S2
7. Check the voltage between ECM harness connector terminals
under the following conditions.
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 terminals under
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
JMBIA1865ZZ
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0137
F13
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.78 V
at least once during this procedure.
P0157
34
[HO2S2 (bank 2)
signal]
JMBIA1866ZZ
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0137
F13
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Keeping engine at idle for 10 min-
utes
The voltage should be above 0.78 V
at least once during this procedure.
P0157
34
[HO2S2 (bank 2)
signal]
P0137, P0157 HO2S2
EC-233
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Check the voltage between ECM harness connector terminals under
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000010094942
Regarding Wiring Diagram information, refer to
.
1.
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 2.
NO
>> Repair or replace ground connection.
2.
CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to
EC-24, "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 P0171 or P0174 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0171 or P0174. Refer to
.
NO
>> GO TO 3.
3.
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 heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.
JMBIA1867ZZ
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0137
F13
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Coasting from 80 km/h (50 MPH) in
D position
The voltage should be above 0.78 V
at least once during this procedure.
P0157
34
[HO2S2 (bank 2)
signal]
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0137
1
F62
1
F13
35
Existed
P0157
2
F56
1
EC-234
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0137, P0157 HO2S2
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, 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 and ground, 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, short to ground or short to power in harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 2
EC-235, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to
EM-31, "Removal and Installation (LH)"
33, "Removal and Installation (RH)"
CAUTION:
• Discard any heated oxygen 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 oxygen 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).
>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
>> INSPECTION END
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0137
1
F62
4
F13
33
Existed
P0157
2
F56
4
34
DTC
HO2S2
Ground
Continuity
Bank
Connector
Terminal
P0137
1
F62
4
Ground
Not existed
P0157
2
F56
4
DTC
ECM
Ground
Continuity
Connector
Terminal
P0137
F13
33
Ground
Not existed
P0157
34
P0137, P0157 HO2S2
EC-235
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Component Inspection
INFOID:0000000010094943
1.
INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
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. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
±25%.
: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is
−25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
3.
CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
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. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
JSBIA3451ZZ
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
F13
33
[HO2S2
(bank 1)
signal]
35
(Sensor
ground)
Revving up to 4,000
rpm under no load at
least 10 times
The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.
34
[HO2S2
(bank 2)
signal]
JMBIA1865ZZ
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