Nissan Pathfinder (2011 year). Instruction — part 331
EC-702
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine.
c.
Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.
CAUTION:
Always drive vehicle at a safe speed.
d. Check 1st trip DTC.
e. If 1st trip DTC is detected, go to
WITH GST
1. Start engine and warm it up to normal operating temperature.
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. Disconnect mass air flow sensor (1) harness connector.
•
: Vehicle front
6. Restart engine and let it idle for at least 5 seconds.
7. Stop engine and reconnect mass air flow sensor harness con-
nector.
8. Select Service $03 with GST. Check that DTC P0102 is
detected.
9. Select Service $04 with GST and erase the DTC P0102.
10. Start engine.
If it is difficult to start engine, the fuel injection system has a mal-
function.
Performing the following procedure is advised.
a. Crank engine while depressing accelerator pedal.
NOTE:
When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
b. If engine starts, go to
.
If engine does not start, check exhaust and intake air leakage visually.
11. Keep engine at idle for at least 5 minutes.
12. Check 1st trip DTC.
13. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go to
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine.
c.
Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.
CAUTION:
Always drive vehicle at a safe speed.
d. Check 1st trip DTC.
e. If 1st trip DTC is detected, go to
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
ALBIA0353ZZ
2011 Pathfinder
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-703
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Diagnosis Procedure
INFOID:0000000006244347
1.
CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.
2. Listen for an exhaust gas leakage before three way catalyst (manifold).
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace malfunctioning part.
2.
CHECK FOR INTAKE AIR LEAKAGE
1. Listen for an intake air leakage after the mass air flow sensor.
2. Check PCV hose connection.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace malfunctioning part.
3.
CHECK AIR FUEL RATIO SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding air fuel ratio (A/F) sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between A/F sensor 1 terminals and ECM terminals as per the following.
Refer to Wiring Diagram.
PBIB1216E
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
A/F sensor 1 terminal
ECM terminal
Bank 1
1
35
2
56
Bank 2
1
16
2
75
Continuity should exist.
ALBIA0360ZZ
2011 Pathfinder
EC-704
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
5. Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
6. Also check harness for short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to
2. Install fuel pressure gauge and check fuel pressure. Refer to
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Fuel pump and circuit (Refer to
• Fuel pressure regulator (Refer to
• Fuel lines (Refer to
• Fuel filter for clogging
>> Repair or replace malfunctioning part.
6.
CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.
OK or NG
OK
>> GO TO 7.
NG
>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
grounds. Refer to
7.
CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
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.
At idling: Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
3.0 - 9.0 g·m/sec:
At idling
9.0 - 28.0 g·m/sec:
At 2,500 rpm
3.0 - 9.0 g·m/sec:
at idling
9.0 - 28.0 g·m/sec:
at 2,500 rpm
2011 Pathfinder
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-705
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3. Check that each circuit produces a momentary engine speed drop.
Without CONSULT-III
1. Start engine.
2. Listen to each fuel injector operating sound.
OK or NG
OK
>> GO TO 8.
NG
>> Perform trouble diagnosis for FUEL INJECTOR, refer to
8.
CHECK FUEL INJECTOR
1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
2. Turn ignition switch OFF.
3. Disconnect all fuel injector harness connectors.
4. Remove fuel injector gallery assembly. Refer to
EM-181, "Removal and Installation"
Keep fuel hose and all fuel injectors connected to fuel injector gallery.
5. For DTC P0171, reconnect fuel injector harness connectors on bank 1.
For DTC P0174, reconnect fuel injector harness connectors on bank 2.
6. Disconnect all ignition coil harness connectors.
7. Prepare pans or saucers under each fuel injector.
8. Crank engine for approximately 3 seconds.
For DTC P0171, check that fuel sprays out from fuel injectors on
bank 1.
For DTC P0174, check that fuel sprays out from fuel injectors on
bank 2.
OK or NG
OK
>> GO TO 9.
NG
>> Replace fuel injectors from which fuel does not spray
out. Refer to
. Always replace O-ring with new
ones.
9.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
.
>>
INSPECTION END
Clicking noise should be heard.
PBIB1986E
Fuel should be sprayed evenly for each fuel injector.
PBIB1726E
2011 Pathfinder
EC-706
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
On Board Diagnosis Logic
INFOID:0000000006244348
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (the actual mixture ratio is too rich), the ECM
judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic).
DTC Confirmation Procedure
INFOID:0000000006244349
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
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.
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
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. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-III.
6. Clear the self-learning control coefficient by touching “CLEAR”.
7. Start engine.
If it is difficult to start engine, the fuel injection system has a malfunction.
Performing the following procedure is advised.
a. Crank engine while depressing accelerator pedal.
NOTE:
When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
b. If engine starts, go to
.
If engine does not start, remove ignition plugs and check for fouling, etc. Refer to
.
8. Keep engine at idle for at least 5 minutes.
9. Check 1st trip DTC.
10. The 1st trip DTC P0172 or P0175 should be detected at this stage, if a malfunction exists. If so, go to
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine.
Sensor
Input signal to ECM
ECM function
Actuator
A/F sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel injection control
Fuel injector
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0172
0172
(Bank 1)
Fuel injection system too
rich
• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too
large. (The mixture ratio is too rich.)
• A/F sensor 1
• Fuel injector
• Exhaust gas leakage
• Incorrect fuel pressure
• Mass air flow sensor
P0175
0175
(Bank 2)
2011 Pathfinder
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-707
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
c. Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.
CAUTION:
Always drive vehicle at a safe speed.
d. Check 1st trip DTC.
e. If 1st trip DTC is detected, go to
WITH GST
1. Start engine and warm it up to normal operating temperature.
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. Disconnect mass air flow sensor (1) harness connector.
•
: Vehicle front
6. Restart engine and let it idle for at least 5 seconds.
7. Stop engine and reconnect mass air flow sensor harness con-
nector.
8. Select Service $03 with GST. Check that DTC P0102 is
detected.
9. Select Service $04 with GST and erase the DTC P0102.
10. Start engine.
If it is difficult to start engine, the fuel injection system has a mal-
function.
Performing the following procedure is advised.
a. Crank engine while depressing accelerator pedal.
NOTE:
When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
b. If engine starts, go to
.
If engine does not start, remove spark plugs and check for fouling, etc. Refer to
11. Keep engine at idle for at least 5 minutes.
12. Check 1st trip DTC.
13. The 1st trip DTC P0172 or P0175 should be detected at this stage, if a malfunction exists. If so, go to
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine.
c. Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.
CAUTION:
Always drive vehicle at a safe speed.
d. Check 1st trip DTC.
e. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000006244350
1.
CHECK EXHAUST GAS LEAKAGE
1. Start engine and run it at idle.
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
ALBIA0353ZZ
2011 Pathfinder
EC-708
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
2. Listen for an exhaust gas leakage before three way catalyst (manifold).
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace malfunctioning part.
2.
CHECK FOR INTAKE AIR LEAKAGE
Listen for an intake air leakage after the mass air flow sensor.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace malfunctioning part.
3.
CHECK AIR FUEL RATIO SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding air fuel ratio (A/F) sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between A/F sensor 1 terminals and ECM terminals as per the following.
Refer to Wiring Diagram.
5. Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
PBIB1216E
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
A/F sensor 1 terminal
ECM terminal
Bank 1
1
35
2
56
Bank 2
1
16
2
75
Continuity should exist.
2011 Pathfinder
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-709
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
6. Also check harness for short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to
2. Install fuel pressure gauge and check fuel pressure. Refer to
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Fuel pump and circuit (Refer to
• Fuel pressure regulator (Refer to
>> Repair or replace malfunctioning part.
6.
CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.
OK or NG
OK
>> GO TO 7.
NG
>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
grounds. Refer to
7.
CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3. Check that each circuit produces a momentary engine speed drop.
Without CONSULT-III
1. Start engine.
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.
At idling: Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
3.0 - 9.0 g·m/sec:
At idling
9.0 - 28.0 g·m/sec:
At 2,500 rpm
3.0 - 9.0 g·m/sec:
At idling
9.0 - 28.0 g·m/sec:
At 2,500 rpm
2011 Pathfinder
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст