Nissan Pathfinder (2012 year). Manual — part 354
P2A00, P2A03 A/F SENSOR 1
EC-913
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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EM-169, "Removal and Installation"
>> GO TO 3.
3.
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 4.
4.
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.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace.
5.
CLEAR THE SELF-LEARNING DATA
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.
3. Clear the self-learning control coefficient by touching “CLEAR”.
4. 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?
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor (1) harness connector.
-
: Vehicle front
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness con-
nector.
6. Check that DTC P0102 is displayed.
7. Erase the DTC memory.
8. Check that DTC P0000 is displayed.
9. 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 or No
Yes
>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to
or
No
>> GO TO 6.
6.
CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
ALBIA0353ZZ
August 2012
2012 Pathfinder
EC-914
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P2A00, P2A03 A/F SENSOR 1
3. Check harness connector for water.
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace harness connector.
7.
CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between A/F sensor 1 terminal 4 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E5, F14
• IPDM E/R harness connector E119
• 15 A fuse (No. 54)
• Harness for open or short between A/F sensor 1 and IPDM E/R
>> Repair or replace harness or connectors.
9.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between A/F sensor 1 terminals and ECM terminals as per the following.
Refer to Wiring Diagram.
ALBIA0360ZZ
1.
A/F sensor 1 (bank 2) harness connector
2.
A/F sensor 1 (bank 2)
3.
A/F sensor 1 (bank 1)
4.
A/F sensor 1 (bank 1) harness connector
: Vehicle front
Water should not exit.
Voltage: Battery voltage
PBIB3308E
A/F sensor 1 terminal
ECM terminal
Bank1
1
35
2
56
Bank 2
1
16
2
75
August 2012
2012 Pathfinder
P2A00, P2A03 A/F SENSOR 1
EC-915
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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4. Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
5. Also check harness for short to power.
OK or NG
OK
>> GO TO 10.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK A/F SENSOR 1 HEATER
EC-635, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 13.
11.
CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to
EC-711, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Replace malfunctioning heated oxygen sensor 2.
12.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
.
OK or NG
OK
>> GO TO 13.
NG
>> Repair or replace.
13.
REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to
.
CAUTION:
• Discard any A/F 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 A/F 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).
>> GO TO 14.
14.
CONFIRM A/F ADJUSTMENT DATA
1. Turn ignition switch OFF and then ON.
2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.
3. Make sure that “0.000” is displayed on CONSULT screen.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 15.
15.
CLEAR THE SELF-LEARNING DATA
With CONSULT
Continuity should exist.
Bank 1
Bank 2
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
ECM terminal
1
35
1
16
2
56
2
75
Continuity should not exist.
August 2012
2012 Pathfinder
EC-916
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P2A00, P2A03 A/F SENSOR 1
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.
3. Clear the self-learning control coefficient by touching “CLEAR”.
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor (1) harness connector.
-
: Vehicle front
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness con-
nector.
6. Check that DTC P0102 is displayed.
7. Erase the DTC memory.
8. Check that DTC P0000 is displayed.
>> GO TO 16.
16.
CONFIRM A/F ADJUSTMENT DATA
1. Turn ignition switch OFF and then ON.
2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.
3. Check that “0.000” is displayed on CONSULT screen.
>>
INSPECTION END
ALBIA0353ZZ
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2012 Pathfinder
ASCD BRAKE SWITCH
EC-917
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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ASCD BRAKE SWITCH
Component Description
INFOID:0000000007358833
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by two kinds of input (ON/OFF signal).
Diagnosis Procedure
INFOID:0000000007358834
1.
CHECK OVERALL FUNCTION-I
With CONSULT
1. Turn ignition switch ON.
2. Select “BRAKE SW 1” in “DATA MONITOR” mode with CONSULT.
3. Check “BRAKE SW 1” indication under the following conditions.
Without CONSULT
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the
following conditions.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
BBIA0560E
CONDITION
INDICATION
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
CONDITION
VOLTAGE
Brake pedal: Fully released
Battery voltage
Brake pedal: Slightly depressed
Approximately 0 V
MBIB0061E
BBIA0560E
August 2012
2012 Pathfinder
EC-918
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
4. Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No. 12)
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ASCD BRAKE SWITCH
EC-918, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace ASCD brake switch. Refer to
6.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000007358835
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
August 2012
2012 Pathfinder
ASCD BRAKE SWITCH
EC-919
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.
If NG, adjust ASCD brake switch installation, refer to
, and perform step 3 again.
Condition
Continuity
Brake pedal: Fully released
Should exist.
Brake pedal: Slightly depressed
Should not exist.
SEC023D
August 2012
2012 Pathfinder
EC-920
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD INDICATOR
ASCD INDICATOR
Component Description
INFOID:0000000007358836
ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD
system is ready for operation.
SET indicator illuminates when the following conditions are met.
• CRUISE indicator is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of the
ASCD setting.
SET indicator remains lit during ASCD control.
Diagnosis Procedure
INFOID:0000000007358837
1.
CHECK OVERALL FUNCTION
Check ASCD indicator under the following conditions.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 2.
2.
CHECK DTC
Check that DTC U0101 or U1001 is not displayed.
OK or NG
OK
>> GO TO 3.
NG
>> Perform trouble diagnosis for DTC U0101 or U1001. Refer to
EC-624, "DTC Confirmation Proce-
EC-625, "DTC Confirmation Procedure"
3.
CHECK COMBINATION METER FUNCTION
MWI-27, "CONSULT Function (METER/M&A)"
OK or NG
OK
>> GO TO 4.
NG
>> Go to
4.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE LAMP
• Ignition switch: ON
• MAIN switch: Pressed at the 1st
time
→
at the 2nd time
ON
→
OFF
SET LAMP
• MAIN switch: ON
• When vehicle speed : Between
40 km/h (25 MPH) and 144 km/h
(89 MPH)
• ASCD: Operating
ON
• ASCD: Not operating
OFF
August 2012
2012 Pathfinder
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