Nissan Pathfinder. Manual — part 522
EC-394
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1805 BRAKE SWITCH
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to
EC-384, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace stop lamp switch. Refer to
BR-20, "Removal and Installation"
.
Component Inspection (Stop Lamp Switch)
INFOID:0000000009178320
1.
CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-II
1. Adjust stop lamp switch installation. Refer to
.
2. Check harness continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
BR-20, "Removal and Installation"
.
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E38
2
E16
122
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P2096, P2097, P2098, P2099 A/F SENSOR 1
EC-395
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P2096, P2097, P2098, P2099 A/F SENSOR 1
DTC Logic
INFOID:0000000009178321
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Clear the mixture ratio self-learning value. Refer to
.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
6. Let engine idle for 1 minute.
7. Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
8. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009178322
1.
RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2
Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to
EM-33, "Removal and Installation (bank 1)"
>> GO TO 2.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible Cause
P2096
POST CAT FUEL TRIM SYS
B1
(Post catalyst fuel trim system
too lean bank 1)
The output voltage computed by ECM from the A/
F sensor 1 signal is shifts to the lean side for a
specified period.
• A/F sensor 1 (bank 1)
• A/F sensor 1 heater
• Heated oxygen sensor 2 (bank 1)
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks
P2097
POST CAT FUEL TRIM SYS
B1
(Post catalyst fuel trim system
too rich bank 1)
The A/F signal computed by ECM from the A/F
sensor 1 signal is shifts to the rich side for a spec-
ified period.
P2098
POST CAT FUEL TRIM SYS
B2
(Post catalyst fuel trim system
too lean bank 2)
The output voltage computed by ECM from the A/
F sensor 1 signal is shifts to the lean side for a
specified period.
• A/F sensor 1 (bank 2)
• A/F sensor 1 heater
• Heated oxygen sensor 2 (bank 2)
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks
P2099
POST CAT FUEL TRIM SYS
B2
(Post catalyst fuel trim system
too rich bank 2)
The A/F signal computed by ECM from the A/F
sensor 1 signal is shifts to the rich side for a spec-
ified period.
EC-396
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P2096, P2097, P2098, P2099 A/F SENSOR 1
2.
CHECK FOR EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 2.
Is exhaust gas leak detected?
YES
>> Repair or replace.
NO
>> GO TO 3.
3.
CHECK FOR INTAKE AIR LEAKAGE
1. Start engine and run it at idle.
2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES
>> GO TO 4.
NO
>> Repair or replace malfunctioning part.
4.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to
.
2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to
or
NO
>> GO TO 5.
5.
CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector for water.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness connector.
6.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.
Water should not exit.
DTC
A/F sensor
Ground
Voltage (V)
Bank
Connector
Terminal
P2096
P2097
1
F5
4
Ground
Battery voltage
P2098
P2099
2
F65
4
P2096, P2097, P2098, P2099 A/F SENSOR 1
EC-397
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
8.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
5. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK A/F SENSOR 1 HEATER
Check A/F sensor 1 heater. Refer to
EC-184, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 12.
10.
CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to
EC-187, "Component Inspection"
DTC
A/F sensor 1
IPDM E/R
Continuity
Bank
Connector
Terminal
Connector
Terminal
P2096
P2097
1
F5
4
F19
52
Existed
P2098
P2099
2
F65
4
53
DTC
A/F sensor 1
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P2096
P2097
1
F5
1
F52
69
Existed
2
73
P2098
P2099
2
F65
1
77
2
81
DTC
A/F sensor 1
Ground
Continuity
Bank
Connector
Terminal
P2096
P2097
1
F5
1
Ground
Not existed
2
P2098
P2099
2
F65
1
2
DTC
ECM
Ground
Continuity
Connector
Terminal
P2096
P2097
F52
69
Ground
Not existed
73
P2098
P2099
77
81
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