Nissan Pathfinder (2011 year). Manual — part 357
EC-910
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ELECTRICAL LOAD SIGNAL
>>
INSPECTION END
2011 Pathfinder
FUEL INJECTOR
EC-911
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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FUEL INJECTOR
Component Description
INFOID:0000000006244609
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor 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 dura-
tion. 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:0000000006244610
1.
INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
Yes or No
Yes
>> GO TO 2.
No
>> GO TO 3.
2.
CHECK OVERALL FUNCTION
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.
2. Listen to each fuel injector operating sound.
Clicking noise should be heard.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 3.
3.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
SEF375Z
PBIB1986E
BBIA0374E
2011 Pathfinder
EC-912
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
FUEL INJECTOR
4. Check voltage between fuel injector terminal 1 and ground with
CONSULT-III or tester.
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 connector E119
• 15 A fuse (No. 55)
• Harness for open or short between fuel injector and fuse
>> Repair harness or connectors.
5.
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, 44,
63.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK FUEL INJECTOR
EC-912, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning fuel injector. Refer to
.
7.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000006244611
FUEL INJECTOR
1. Disconnect fuel injector harness connector.
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
2011 Pathfinder
FUEL INJECTOR
EC-913
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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
EC-914
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000006244612
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:0000000006244613
1.
CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
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.
BBIA0529E
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
ALBIA0356ZZ
2011 Pathfinder
FUEL PUMP
EC-915
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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 9.
4.
DETECT MALFUNCTIONING PART
Check harness for open or short between IPDM E/R and ECM.
>> Repair harness or connectors.
5.
CHECK FUSE
1. Turn ignition switch OFF.
2. Disconnect 15 A fuse (No. 48).
3. Check 15 A fuse.
OK or NG
OK
>> GO TO 6.
NG
>> Replace fuse.
6.
CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3. Disconnect IPDM E/R harness connector E119.
4. Check harness continuity between IPDM E/R terminal 13 and
“fuel level sensor unit and fuel pump” terminal 1, “fuel level sen-
sor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E41, C1
• Harness for open or short between fuel pump and IPDM E/R
Voltage: Battery voltage
PBIB1187E
Voltage: Battery voltage
PBIB2656E
Continuity should exist.
BBIA0545E
2011 Pathfinder
EC-916
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
FUEL PUMP
• Harness for open or short between fuel pump and ground
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK FUEL PUMP
EC-916, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace “fuel level sensor unit and fuel pump”. Refer to
.
9.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
OK or NG
OK
>> Replace IPDM E/R. Refer to
NG
>> Repair or replace harness or connectors.
Component Inspection
INFOID:0000000006244614
FUEL PUMP
1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check resistance between fuel level sensor unit and fuel pump
terminals 1 and 3.
Resistance: 0.2 - 5.0
Ω
[at 25
°
C (77
°
F)]
SEC918C
2011 Pathfinder
IGNITION SIGNAL
EC-917
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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IGNITION SIGNAL
Component Description
INFOID:0000000006244615
IGNITION COIL & POWER TRANSISTOR
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.
Diagnosis Procedure
INFOID:0000000006244616
1.
CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No
>> GO TO 4.
2.
CHECK OVERALL FUNCTION
With CONSULT-III
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
2. Check that each circuit produces a momentary engine speed drop.
OK or NG
OK
>>
INSPECTION END
NG
>> GO TO 10.
3.
CHECK OVERALL FUNCTION
Without CONSULT-III
1. Let engine idle.
2. Read the voltage signal between ECM terminals 46, 60, 61, 62,
65, 79, 80, 81 and ground with an oscilloscope.
3. Check that the oscilloscope screen shows the signal wave as
shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.
1.
Ignition coils (with power transistor)
(bank 2)
2.
Ignition coils (with power transistor)
(bank 1)
: Vehicle front
ALBIA0370ZZ
PBIB2094E
PBIB0044E
2011 Pathfinder
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