Infiniti QX4 (R50). Manual - part 545

DIAGNOSTIC PROCEDURE 2

=NBSC0020S04

Check “B” Terminal Circuit

NBSC0020S0401

1

CHECK “B” TERMINAL CONNECTION

Check to see if “B” terminal is clean and tight.

OK or NG

OK

©

GO TO 2. Confirm repair by performing complete Battery/Starting/Charging system test.

NG

©

Repair “B” terminal connection.

2

CHECK ALTERNATOR “B” TERMINAL CIRCUIT

Check voltage between alternator terminal B and ground using a digital circuit tester.

SEL425X

OK or NG

OK

©

GO TO 3.

NG

©

Check the following.

I

120A fusible link (letter a, located in fuse and fusible link box)

I

Harness for open or short between alternator and fusible link

3

CHECK “B” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)

Check voltage between alternator terminal B and battery positive terminal using a digital tester.

SEL426X

OK or NG

OK

©

Replace the alternator. Confirm repair by performing complete Battery/Starting/Charging
system test.

NG

©

Check harness between the battery and the alternator for poor continuity.

CHARGING SYSTEM

Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)

SC-26

DIAGNOSTIC PROCEDURE 3

=NBSC0020S05

Check “S” Terminal Circuit

NBSC0020S0501

1

CHECK “S” TERMINAL CONNECTION

Check to see if “S” terminal is clean and tight.

OK or NG

OK

©

GO TO 2.

NG

©

Repair “S” terminal connection. Confirm repair by performing complete Battery/Starting/
Charging system test.

2

CHECK ALTERNATOR “S” TERMINAL CIRCUIT

Check voltage between alternator terminal 2 and ground using a digital circuit tester.

SEL427X

OK or NG

OK

©

GO TO 3.

NG

©

Check the following.

I

7.5A fuse (No. 65, located in fuse and fusible link box)

I

Harness for open or short between alternator and fuse

3

CHECK “S” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)

Check voltage between alternator terminal 2 and battery positive terminal using a digital tester.

SEL428X

OK or NG

OK

©

Replace the alternator. Confirm repair by performing complete Battery/Starting/Charging
system test.

NG

©

Check harness between the battery and the alternator for poor continuity.

MALFUNCTION INDICATOR

NBSC0020S06

The

IC

regulator

warning

function

activates

to

illuminate

“CHARGE” warning lamp, if any of the following symptoms occur
while alternator is operating:

I

Excessive voltage is produced.

I

No voltage is produced.

GI

MA

EM

LC

EC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

EL

IDX

CHARGING SYSTEM

Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont’d)

SC-27

Construction

NBSC0012

MEL951LA

MEL952LA

Removal and Installation

NBSC0013

CHARGING SYSTEM

Construction

SC-28

Battery

NBSC0014

Applied area

USA

Canada

Type

80D26R

Capacity

V-AH

12-65

Cold cranking current

A

(For reference value)

582

Starter

NBSC0015

Type

M0T50371

MITSUBISHI make

Reduction gear type

System voltage

12V

No-load

Terminal voltage

11.0V

Current

Less than 90A

Revolution

More than 2,700 rpm

Minimum diameter of commutator

28.8 mm (1.134 in)

Minimum length of brush

7.0 mm (0.276 in)

Brush spring tension

18.3 - 24.8 N (1.87 - 2.53 kg, 4.11 - 5.58 lb)

Movement “



” in height of pinion assembly

0.5 - 2.0 mm (0.020 - 0.079 in)

Alternator

NBSC0016

Type

LR1110-712

HITACHI make

Nominal rating

12V-110A

Ground polarity

Negative

Minimum revolution under no-load (When 13.5 volts is applied)

Less than 1,000 rpm

Hot output current (When 13.5 volts is applied)

More than 35A/1,300 rpm
More than 85A/2,500 rpm

More than 110A/5,000 rpm

Regulated output voltage

14.1 - 14.7V

Minimum length of brush

More than 6.0 mm (0.236 in)

Brush spring pressure

1.0 - 3.43 N (102 - 350 g, 3.60 - 12.34 oz)

Slip ring minimum outer diameter

More than 26.0 mm (1.024 in)

Rotor (Field coil) resistance

2.31

Ω

GI

MA

EM

LC

EC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

EL

IDX

SERVICE DATA AND SPECIFICATIONS (SDS)

Battery

SC-29