Nissan Pathfinder (2006 year). Manual - part 222

FUEL INJECTOR

EC-635

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EC

2006 Pathfinder

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

UBS00KI9

1. 

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?
Yes or No

Yes (With CONSULT-II)>>GO TO 2.
Yes (Without CONSULT-II)>>GO TO 3.
No

>> GO TO 7.

2. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.

3.

Make sure that each circuit produces a momentary engine
speed drop.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

21
22
23
40
41
42

W
LG
SB
V
R
O

Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

SEC984C

SEC985C

PBIB0133E

EC-636

FUEL INJECTOR

2006 Pathfinder

3. 

CHECK FUNCTION OF FUEL INJECTOR-I

 Without CONSULT-II

1.

Stop engine.

2.

Disconnect harness connector F44, F101.

3.

Turn ignition switch ON.

4.

Check voltage between harness connector F44 terminal 3 and
ground with CONSULT-II 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.

BBIA0587E

Voltage: Battery voltage

Cylinder

Harness connector F44 

terminal

ECM terminal

1

2

23

3

1

22

5

4

21

Continuity should exist.

PBIB2633E

FUEL INJECTOR

EC-637

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EC

2006 Pathfinder

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.

3.

Listen to fuel injectors No. 2, No. 4, No.6 operating sound.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

Cylinder

Harness connector F101 terminal

(+)

(–)

1

3

2

3

3

1

5

3

4

Operating sound should exist.

PBIB2634E

Clicking noise should exist.

PBIB1986E

EC-638

FUEL INJECTOR

2006 Pathfinder

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-II 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

OK

>> GO TO 11.

NG

>> GO TO 10.

BBIA0546E

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

FUEL INJECTOR

EC-639

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EC

2006 Pathfinder

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

Refer to 

EC-639, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel injector.

12. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

UBS00KIA

FUEL INJECTOR

1.

Disconnect injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Removal and Installation

UBS00KIB

FUEL INJECTOR

Refer to 

EM-35, "FUEL INJECTOR AND FUEL TUBE"

 .

Resistance: 11.1 - 14.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

EC-640

FUEL PUMP

2006 Pathfinder

FUEL PUMP

PFP:17042

Description

UBS00KIC

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.

CONSULT-II Reference Value in Data Monitor Mode

UBS00KID

Specification data are reference values.

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

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

●

For 1 second after turning ignition switch ON

●

Engine running or cranking

ON

●

Except above conditions

OFF

FUEL PUMP

EC-641

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2006 Pathfinder

Wiring Diagram

UBS00KIE

BBWA1775E

EC-642

FUEL PUMP

2006 Pathfinder

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

UBS00KIF

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.

4.

Check voltage between ECM terminal 113 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

113

V

Fuel pump relay

[Ignition switch: ON]

●

For 1 second after turning ignition switch ON

[Engine is running]

0 - 1.5V

[Ignition switch: ON]

●

More than 1 second after turning ignition 
switch ON

BATTERY VOLTAGE
(11 - 14V)

BBIA0563E

Voltage: Battery voltage 

PBIB1187E