Nissan Pathfinder (2008 year). Manual — part 284
COOLING FAN
EC-389
< COMPONENT DIAGNOSIS >
[VQ40DE]
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1.
Disconnect cooling fan motor harness connector.
2.
Check harness continuity between the following;
cooling fan motor terminal 1 and IPDM E/R terminal 20,
cooling fan motor terminal 2 and IPDM E/R terminal 24.
Refer to Wiring Diagram.
3.
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 COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT
1.
Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to Wiring Diagram.
2.
Also check harness for short to power.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to power in harness or connectors.
6.
CHECK COOLING FAN MOTOR
EC-389, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace cooling fan motor.
7.
CHECK INTERMITTENT INCIDENT
Perform
.
OK or NG
OK
>> INSPETION END
NG
>> Repair or replace harness or connector.
Component Inspection
INFOID:0000000001376345
COOLING FAN MOTOR
1.
Disconnect cooling fan motor harness connectors.
2.
Supply cooling fan motor terminals with battery voltage and
check operation.
Cooling fan motor should operate.
If NG, replace cooling fan motor.
Continuity should exist.
BBIA0555E
Continuity should exist.
Cooling fan speed
Cooling fan motor terminals
(+)
(
−
)
Low
1
3 and 4
2
3 and 4
High
1 and 2
3 and 4
SEF734W
EC-390
< COMPONENT DIAGNOSIS >
[VQ40DE]
ELECTRICAL LOAD SIGNAL
ELECTRICAL LOAD SIGNAL
Description
INFOID:0000000001376499
The electrical load signal (Headlamp switch signal, etc.) is transferred through the CAN communication line
from BCM to ECM via IPDM E/R.
Diagnosis Procedure
INFOID:0000000001376501
1.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1.
Turn ignition switch ON.
2.
Connect CONSULT-III and select “DATA MONITOR” mode.
3.
Select “LOAD SIGNAL” and check indication under the following conditions.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check “LOAD SIGNAL” indication under the following conditions.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 5.
3.
CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION
Select “HEATER FAN SW” and check indication under the following conditions.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
4.
CHECK REAR WINDOW DEFOGGER SYSTEM
>> INSPECTION END
5.
CHECK HEADLAMP SYSTEM
>> INSPECTION END
6.
CHECK HEATER FAN CONTROL SYSTEM
HAC-106, "Symptom Matrix Chart"
or
HAC-171, "Symptom Matrix Chart"
.
Condition
Indication
Rear window defogger switch: ON
ON
Rear window defogger switch: OFF
OFF
Condition
Indication
Lighting switch: ON at 2nd position
ON
Lighting switch: OFF
OFF
Condition
Indication
Heater fan control switch: ON
ON
Heater fan control switch: OFF
OFF
ELECTRICAL LOAD SIGNAL
EC-391
< COMPONENT DIAGNOSIS >
[VQ40DE]
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>> INSPECTION END
EC-392
< COMPONENT DIAGNOSIS >
[VQ40DE]
FUEL INJECTOR
FUEL INJECTOR
Component Description
INFOID:0000000001376502
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:0000000001376505
1.
INSPECTION START
Turn ignition switch to START.
Is any cylinder 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, F101.
3.
Turn ignition switch ON.
SEF375Z
BBIA0587E
FUEL INJECTOR
EC-393
< COMPONENT DIAGNOSIS >
[VQ40DE]
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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
• 15A fuse
• Harness for open or short between harness connector F44 and fuse
• Harness for open or short between harness connector F101 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 F101 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 F101 terminal
(+)
(–)
1
3
2
3
3
1
5
3
4
Operating sound should exist.
PBIB2634E
EC-394
< COMPONENT DIAGNOSIS >
[VQ40DE]
FUEL INJECTOR
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, F101
• IPDM E/R harness connector E119
• 15A fuse
• 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.
FUEL INJECTOR
EC-395
< COMPONENT DIAGNOSIS >
[VQ40DE]
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OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F101, 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-395, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace fuel injector.
12.
CHECK INTERMITTENT INCIDENT
.
>> INSPECTION END
Component Inspection
INFOID:0000000001376506
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
EC-396
< COMPONENT DIAGNOSIS >
[VQ40DE]
FUEL PUMP
FUEL PUMP
Description
INFOID:0000000001376507
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:0000000001376510
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
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