Infiniti Q45. Manual - part 792

STARTING SYSTEM

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DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit

1. 

CHECK “B” TERMINAL CIRCUIT

1.

Remove fuel pump fuse.

2.

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

3.

Turn ignition switch OFF.

4.

Make sure that starter motor “B” terminal E313 terminal 2 (B/R) connection is clean and tight.

5.

Check voltage between starter motor “B” terminal E313 terminal
2 (B/R) and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check harness between battery and starter motor for

open circuit.

2. 

CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

Check voltage between starter motor B terminal E313 terminal 2 (B/
R) and battery positive terminal.

OK or NG

OK

>> GO TO 3.

NG

>> Check harness between the battery and the starter

motor for poor continuity.

3. 

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

1.

Turn ignition switch OFF.

2.

Check voltage between starter motor case and battery negative
terminal.

OK or NG

OK

>> “B” terminal circuit is OK. Further inspection necessary.

Refer to 

SC-12, "WORK FLOW"

 .

NG

>> Check the starter motor case and ground for poor conti-

nuity.

2 (B/R) – Ground

: Battery voltage

PKIA2842E

2 (B/R) – Battery positive terminal

When the ignition switch is 
in START position

: Less than 0.5 V

PKIA2370E

Starter motor case – Battery negative terminal

When the ignition switch is 
in START position

: Less than 0.2 V

PKIA2943E

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STARTING SYSTEM

DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit

1. 

CHECK “S” CONNECTOR CIRCUIT

1.

Remove fuel pump fuse.

2.

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

3.

Turn ignition switch OFF.

4.

Disconnect starter motor connector.

5.

Check voltage between starter motor harness connector E312
terminal 1 (R) and ground.

OK or NG

OK

>> “S” connector circuit is OK. Further inspection neces-

sary. Refer to 

SC-12, "WORK FLOW"

 .

NG

>> Check the following.

●

50 A fusible link (letter G , located in fuse, fusible link
and relay block)

●

Ignition switch

●

Park/neutral position relay

●

Harness for open or short

MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE

Removal and Installation 

NKS0016Q

REMOVAL 

1.

Disconnect the battery cable from the negative terminal.

2.

Remove engine undercover.

3.

Disconnect starter motor connector.

4.

Remove “B” terminal nut.

5.

Remove engine mounting insulator (right side). Refer to 

EM-79,

"ENGINE ASSEMBLY"

 .

6.

Remove starter motor mounting bolt and nut.

7.

Remove starter motor to the direction of under side the vehicle.

INSTALLATION

Installation is the reverse order of removal.

CAUTION:

Be sure to tighten B terminal nut carefully.

1 (R) – Ground

When the ignition switch is in 
START position

: Battery voltage

PKIA2807E

Engine coolant temperature

Voltage [V]

−

30 

°

C to 

−

20 

°

C (

−

22 

°

F to 

−

4 

°

F)

8.6

−

19 

°

C to 

−

10 

°

C (

−

2 

°

F to 14 

°

F)

9.1

−

9 

°

C to 0 

°

C (16 

°

F to 32 

°

F)

9.5

More than 1 

°

C (More than 34 

°

F)

9.9

PKIB0636E

STARTING SYSTEM

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Disassembly and Assembly 

NKS0016R

Inspection After Disassembly 

NKS0016S

PINION/CLUTCH CHECK 

1.

Inspect pinion teeth.

●

Replace pinion if teeth are worn or damaged. (Also check condition of ring gear teeth.)

2.

Inspect reduction gear teeth.

●

Replace reduction gear if teeth are worn or damaged. (Also check condition of armature shaft gear
teeth.)

3.

Check if pinion locks in one direction and rotates smoothly in the opposite direction.

●

If it locks or rotates in both directions, or unusual resistance is evident, replace.

1.

Magnetic switch assembly

2.

Adjusting plate

3.

Packing

4.

Plate

5.

Shift lever

6.

Sleeve bearing

7.

Gear case

8.

Yoke

9.

Armature

10. Washer

11.

Rear bearing

12. Brush holder assembly

13. Rear cover

14. Cover

15. Packing

16. Ball

17. Planetary gear

18. Pinion shaft

19. Thrust washer

20. Internal gear

21. Pinion assembly

22. Pinion stopper

23. Stopper clip

PKIB0269E

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CHARGING SYSTEM

CHARGING SYSTEM 

PFP:00011

System Description 

NKS0016T

DESCRIPTION

The alternator 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

●

through 15A fuse [No. 56, located in the fuse, fusible link and relay block (J/B)]

●

to alternator terminal 4 (“S” terminal).

“B” terminal supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 4 (“S” terminal) detecting the input voltage.
The alternator is grounded to the engine block.
With the ignition switch in the ON or START position, power is supplied

●

through 10A fuse [No. 9, located in the fuse block (J/B) No.1]

●

to combination meter terminal 59 for the charge warning lamp.

Ground is supplied

●

to combination meter terminal 13

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through alternator terminal 3 (“L” terminal)

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to alternator terminal 2 (“E” terminal)

●

through ground E307.

The charge warning lamp will illuminate. When the alternator 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 malfunction is indicated.

MALFUNCTION INDICATOR

The IC regulator warning function activates to illuminate the charge warning lamp, if any of the following symp-
toms occur while alternator is operating:

●

Excessive voltage is produced.

●

No voltage is produced.