Nissan Pathfinder (2011 year). Manual — part 293
EC-398
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
ELECTRICAL LOAD SIGNAL
>>
INSPECTION END
2011 Pathfinder
FUEL INJECTOR
EC-399
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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FUEL INJECTOR
Component Description
INFOID:0000000006244154
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector, the coil in the fuel injector is
energized. The energized coil pulls the ball valve back and allows
fuel to flow through the fuel injector into the intake manifold. The
amount of fuel injected depends upon the injection pulse duration.
Pulse duration is the length of time the fuel injector remains open.
The ECM controls the injection pulse duration based on engine fuel
needs.
Diagnosis Procedure
INFOID:0000000006244155
1.
INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
Yes or No
Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No
>> GO TO 7.
2.
CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3. Make sure that each circuit produces a momentary engine speed drop.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 7.
3.
CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT-III
1. Stop engine.
2. Disconnect harness connector F44 (3), F201 (1)
3. Turn ignition switch ON.
SEF375Z
2
: Vacuum tank
: Front
AWBIA0686ZZ
2011 Pathfinder
EC-400
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
FUEL INJECTOR
4. Check voltage between harness connector F44 terminal 3 and
ground with CONSULT-III or tester.
5. Turn ignition switch OFF.
6. Disconnect ECM harness connector.
7. Check harness continuity between harness connector F44 and
ECM as follows.
Refer to Wiring Diagram.
8. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between harness connector F44 and fuse
• Harness for open or short between harness connector F201 and fuel injector
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK FUNCTION OF FUEL INJECTOR-II
Provide battery voltage between harness connector F201 as follows
and then interrupt it. Listen to each fuel injector operating sound.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 7.
6.
CHECK FUNCTION OF FUEL INJECTOR-III
1. Reconnect all harness connector disconnected.
2. Start engine.
Voltage: Battery voltage
Cylinder
Harness connector F44
terminal
ECM terminal
1
2
23
3
1
22
5
4
21
Continuity should exist.
PBIB2633E
Cylinder
Harness connector F201 terminal
(+)
(–)
1
3
2
3
3
1
5
3
4
Operating sound should exist.
PBIB2634E
2011 Pathfinder
FUEL INJECTOR
EC-401
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3. Listen to fuel injectors No. 2, No. 4, No.6 operating sound.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 7.
7.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
4. Check voltage between fuel injector terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness connectors F44, F201
• IPDM E/R harness connector E119
• 15 A fuse (No.55)
• Harness for open or short between fuel injector and fuse
>> Repair harness or connectors.
9.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
Clicking noise should exist.
PBIB1986E
BBIA0546E
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
2011 Pathfinder
EC-402
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
FUEL INJECTOR
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F201, F44
• Harness for open or short between fuel injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK FUEL INJECTOR
EC-402, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel injector. Refer to
EM-47, "Removal and Installation"
.
12.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000006244156
FUEL INJECTOR
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
Resistance: 11.1 - 14.5
Ω
[at 10 - 60
°
C (50 - 140
°
F)]
PBIB1727E
2011 Pathfinder
FUEL PUMP
EC-403
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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FUEL PUMP
Description
INFOID:0000000006244157
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.
Diagnosis Procedure
INFOID:0000000006244158
1.
CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 1 second after ignition switch is turned ON.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 2.
2.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
Sensor
Input Signal to ECM
ECM Function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
Fuel pump control
Fuel pump relay
Battery
Battery voltage*
Condition
Fuel pump operation
Ignition switch is turned to ON.
Operates for 1 second.
Engine running and cranking
Operates.
When engine is stopped
Stops in 1.5 seconds.
Except as shown above
Stops.
PBIB1569E
BBIA0563E
2011 Pathfinder
EC-404
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
FUEL PUMP
4. Check voltage between ECM terminal 113 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
Check voltage between IPDM E/R terminal 46 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 12.
4.
DETECT MALFUNCTIONING PART
Check harness for open or short between IPDM E/R and ECM
>> Repair harness or connectors.
5.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
4. Turn ignition switch ON.
5. Check voltage between “fuel level sensor unit and fuel pump”
terminal 1 and ground with CONSULT-III or tester.
6. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 6.
6.
CHECK 15A FUSE
1. Turn ignition switch OFF.
Voltage: Battery voltage
PBIB1187E
Voltage: Battery voltage
PBIB2656E
BBIA0545E
Voltage:
Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.
PBIB0795E
2011 Pathfinder
FUEL PUMP
EC-405
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2. Disconnect 15A fuse. For the fuse arrangement, refer to
PG-75, "IPDM E/R Terminal Arrangement"
3. Check 15 A fuse (No.48).
OK or NG
OK
>> GO TO 7.
NG
>> Replace fuse.
7.
CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV
1. Disconnect IPDM E/R harness connector E119.
2. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 1 and IPDM E/R termi-
nal 13.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to ground.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors C1, E41
• Harness for open or short between “fuel level sensor unit and fuel pump” and ground
>> Repair open circuit or short to power in harness or connectors.
11.
CHECK FUEL PUMP
EC-406, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel pump. Refer to
FL-11, "Removal and Installation"
.
12.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
.
OK or NG
OK
>> Replace IPDM E/R. Refer to
PCS-29, "Removal and Installation of IPDM E/R"
.
NG
>> Repair or replace harness or connectors.
Continuity should exist.
Continuity should exist.
2011 Pathfinder
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