Nissan Pathfinder (2006 year). Instruction — part 372

STARTING SYSTEM

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2006 Pathfinder

Trouble Diagnoses with Battery/Starting/Charging System Tester

EKS00FTM

NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.

1.

Turn off all loads on the vehicle electrical system.

2.

Perform battery test with Battery/Starting/Charging system
tester. Refer to

SC-13, "Trouble Diagnoses with Battery/Starting/

Charging System Tester"

.

3.

Press “ENTER” to begin the starting system test.

4.

Start the engine.

5.

Diagnosis result is displayed on the tester. Refer to

SC-13,

"DIAGNOSTIC RESULT ITEM CHART"

.

NOTE:

●

If the starter performs normally but the engine does not start,
perform engine diagnosis.

●

For intermittent “NO CRANK” or “NO STARTER OPERA-
TION” incidents, refer to

SC-16, "DIAGNOSTIC PROCE-

DURE 2"

.

DIAGNOSTIC RESULT ITEM CHART

SEL408X

SEL409X

SEL410X

Diagnostic item

Service procedure

CRANKING VOLTAGE NORMAL

Go to

SC-14, "WORK FLOW"

.

CRANKING VOLTAGE LOW

CHARGE BATTERY

Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.) Per-
form battery test again with Battery/Starting/Charging system tester. Refer to

SC-13, "Trouble

Diagnoses with Battery/Starting/Charging System Tester"

.

REPLACE BATTERY

Before replacing battery, clean the battery cable clamps and battery posts. Perform battery
test again with Battery/Starting/Charging system tester. Refer to

SC-13, "Trouble Diagnoses

with Battery/Starting/Charging System Tester"

. If second test result is “REPLACE BAT-

TERY”, then do so. Perform battery test again to confirm repair.

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STARTING SYSTEM

2006 Pathfinder

WORK FLOW

*1

SC-13

*2

SC-15

*3

SC-16

*4

SC-16

WKIA4532E

STARTING SYSTEM

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2006 Pathfinder

DIAGNOSTIC PROCEDURE 1
Check Starter Motor Circuit

1.

CHECK POWER SUPPLY TO STARTER MOTOR

1.

Remove the fuel pump fuse.

2.

Crank or start the engine (where possible) until the fuel pressure is released.

3.

Turn the ignition switch OFF.

4.

Check that the starter motor connector F27 connection is clean and tight.

5.

Check voltage between starter motor connector F27 terminal 2
and ground using a digital circuit tester.

OK or NG

OK

>> GO TO 2.

NG

>> Check harness between the battery and the starter

motor for open circuit.

2.

CHECK VOLTAGE DROP ON STARTER MOTOR CIRCUIT

Check voltage between starter motor connector F27 terminal 2 and
battery positive terminal using a digital circuit tester.

OK or NG

OK

>> GO TO 3.

NG

>> Check harness between the battery and the starter

motor for poor continuity.

3.

CHECK VOLTAGE DROP ON STARTER MOTOR GROUND CIRCUIT

Check voltage between starter motor case and battery negative ter-
minal using a digital circuit tester.

OK or NG

OK

>> Starter motor ground circuit is OK. Further inspection is

necessary. Refer to

SC-14, "WORK FLOW"

.

NG

>> Check harness between the starter motor case and

ground for poor continuity.

Battery voltage should
exist.

WKIA2105E

Ignition switch in
START.

: Less than 0.5V

WKIA2106E

Ignition switch in
START.

: Less than 0.2V

WKIA2107E

SC-16

STARTING SYSTEM

2006 Pathfinder

DIAGNOSTIC PROCEDURE 2
Check Magnetic Switch Circuit

1.

CHECK POWER SUPPLY TO MAGNETIC SWITCH

1.

Remove the fuel pump fuse.

2.

Crank or start the engine (where possible) until the fuel pressure is released.

3.

Turn the ignition switch OFF.

4.

Disconnect starter motor connector E207.

5.

Check voltage between starter motor connector E207 terminal 1
and ground using a digital circuit tester.

OK or NG

OK

>> GO TO 2.

NG

>> Check the following.

●

40A fusible link (letter j , located in fuse and fusible
link box)

●

Ignition switch

●

Starter relay [within the intelligent power distribution module engine room (IPDM E/R)]

●

Starter relay request ON signal

●

Harness for open or short

2.

CHECK VOLTAGE DROP ON MAGNETIC SWITCH CIRCUIT

1.

Turn the ignition switch OFF.

2.

Connect starter motor connector E207.

3.

Check voltage between starter motor connector E207 terminal 1
and battery positive terminal using a digital circuit tester.

OK or NG

OK

>> Magnetic switch circuit is OK. Further inspection is nec-

essary. Refer to

SC-14, "WORK FLOW"

.

NG

>> Check harness between the battery and the magnetic

switch for poor continuity.

Ignition switch in
START.

: Battery voltage

WKIA3181E

Ignition switch in
START.

: Less than 1V

WKIA3182E

STARTING SYSTEM

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2006 Pathfinder

MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE

Removal and Installation

EKS00FTN

REMOVAL

1.

Disconnect the negative battery terminal.

2.

Remove engine undercover, using power tools.

3.

Remove exhaust manifold cover from exhaust manifold (right bank) to gain access to starter cover bolts.
Refer to

EX-4, "REMOVAL"

.

4.

Remove starter cover bolts and starter cover.

Engine coolant temperature

Voltage V

−

30

°

C to

−

20

°

C (

−

22

°

F to

−

4

°

F)

8.4

−

19

°

C to

−

10

°

C (

−

2

°

F to 14

°

F)

8.9

−

9

°

C to 0

°

C (16

°

F to 32

°

F)

9.3

More than 1

°

C (More than 34

°

F)

9.7

WKIA3190E

1.

Starter cover

2.

Starter motor assembly

3.

Starter cover plate (rear)

4.

Transmission housing

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STARTING SYSTEM

2006 Pathfinder

5.

Disconnect terminal "1" connector and terminal "2" nut.

6.

Remove the two starter bolts, using power tools.

7.

Remove the starter.

INSTALLATION

To installation is in the reverse order of removal.

CAUTION:

Be sure to tighten terminal "2" nut carefully.

WKIA3189E

Terminal "2" nut

: 10.8 N·m (1.1 kg-m, 8 ft-lb)

CHARGING SYSTEM

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2006 Pathfinder

CHARGING SYSTEM

PFP:23100

System Description

EKS00FTO

The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 3 through:

●

15A fuse (No. 30, located in the fuse and fusible link box).

Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 3 detecting the input voltage. A pulse width modulated (PWM) signal
is sent from terminal 37 of the IPDM E/R to terminal 4 of the generator. The ECM determines the duty cycle of
the power generation variable voltage control system. The charging circuit is protected by the 140A fusible link
[letter a , located in the fusible link box (battery)].
The generator is grounded through the engine.
With the ignition switch in the ON or START position, power is supplied:

●

through 10A fuse [No. 14, located in the fuse block (J/B)]

●

to combination meter terminal 16 for the charge warning lamp.

Ground is supplied to terminal 2 of the combination meter through terminal 2 of the generator. With power and
ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient voltage
with the engine running, the ground is opened and the charge warning lamp will go off. If the charge warning
lamp illuminates with the engine running, a fault is indicated. The IC regulator warning function activates to
illuminate “CHARGE” warning lamp, if any of the following symptoms occur while generator is operating:

●

Excessive voltage is produced.

●

No voltage is produced.

POWER GENERATION VARIABLE VOLTAGE CONTROL SYSTEM

Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.

Operation

●

The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.

●

ECM judges whether to control voltage according to the battery condition.

●

ECM calculates the target power generation voltage according to the battery condition and sends the cal-
culated value, through CAN lines, as the power generation command value to IPDM E/R.

●

IPDM E/R converts the received power generation command value into the power generation command
signal (PWM signal) and sends it to the IC regulator.

●

The IC regulator performs final control over the power generation voltage.

PKIB4908E

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CHARGING SYSTEM

2006 Pathfinder

●

When there is no power generation command signal, the generator performs the normal power generation
according to the characteristic of the IC regulator.

NOTE:
When any malfunction is detected in the power generation variable voltage control system, power generation
is performed according to the characteristic of the IC regulator in the generator.

Component

BATTERY CURRENT SENSOR

●

Battery current sensor is installed to the negative battery cable
and it detects the charging/discharging current of the battery and
sends the voltage signal to ECM according to the current value.

PKIB4502E