Infiniti QX56 (JA60). Manual - part 922

 

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Infiniti QX56 (JA60). Manual - part 922

 

 

STR-10

< COMPONENT DIAGNOSIS >

B TERMINAL CIRCUIT

COMPONENT DIAGNOSIS

B TERMINAL CIRCUIT

Description

INFOID:0000000005149554

Terminal "2" (B) is constantly supplied with battery power.

Diagnosis Procedure

INFOID:0000000005149555

Regarding Wiring Diagram information, refer to 

STR-14, "Wiring Diagram"

.

CAUTION:

Perform diagnosis under the condition that the engine cannot start by the following procedure.

1. Remove fuel pump fuse.

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

1.

CHECK TERMINAL 2 POWER SUPPLY VOLTAGE

1. Turn ignition switch OFF.

2. Make sure that starter motor connector F27 terminal 2 connection is clean and tight.

3. Check voltage between starter motor connector F27 terminal 2

and ground.

Is there battery voltage present?

YES

>> GO TO 2

NO

>> Check harness between battery and starter motor for

open circuit.

2.

CHECK BATTERY CABLE (VOLTAGE DROP TEST)

1. Shift the transmission into park or neutral.

2. Check voltage between battery positive terminal and starter

motor connector F27 terminal 2 while cranking the engine.

Is the voltage drop less than 0.2V?

YES

>> GO TO 3

NO

>> Check harness between the battery and the starter

motor for high resistance.

3.

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

(+)

(-)

Condition

Voltage

Connector

Terminal

F27

2

Ground

While cranking the 

engine

Battery voltage

AWBIA0122GB

(+)

(-)

Condition

Voltage

Connector

Terminal

F27

2

Battery (+) 

terminal

While cranking the 

engine

Less than 0.2V

AWBIA0123GB

B TERMINAL CIRCUIT

STR-11

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

A

STR

N

P

O

Check voltage between starter motor case and battery negative ter-

minal while cranking the engine.

Is the voltage drop less than 0.2V?

YES

>> Terminal 2 circuit is OK. Further inspection necessary.

Refer to 

STR-5, "Work Flow"

.

NO

>> Check the starter motor case to engine mounting for

high resistance.

(+)

(-)

Condition

Voltage

Starter motor 

case

Battery (-) terminal

While cranking the 

engine

Less than 0.2V

AWBIA0124GB

STR-12

< COMPONENT DIAGNOSIS >

S CONNECTOR CIRCUIT

S CONNECTOR CIRCUIT

Description

INFOID:0000000005149556

Terminal "1" (S) is the power supply for the starter motor magnetic switch. Terminal 1 is supplied with power

when the ignition switch is turned to the START position while the selector lever is in the P or N position.

Diagnosis Procedure

INFOID:0000000005149557

Regarding Wiring Diagram information, refer to 

STR-14, "Wiring Diagram"

.

CAUTION:

Perform diagnosis under the condition that engine cannot start by the following procedure.

1. Remove fuel pump fuse.

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

1.

CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect starter motor connector F28.

3. Shift transmission into park or neutral.

4. Check voltage between starter motor harness connector F28

terminal 1 and ground with the ignition in START.

Is battery voltage present?

YES

>> Magnetic switch circuit is OK. Further inspection necessary. Refer to 

STR-5, "Work Flow"

.

NO

>> GO TO 2

2.

CHECK CONNECTOR

1. Turn ignition switch OFF.

2. Check the IPDM E/R harness connector E120 and starter motor harness connector F28 for damage, bent

pins and loose connections.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair the terminal and connector.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1. Disconnect IPDM E/R connector E120 and starter motor con-

nector F28.

2. Check continuity between starter motor harness connector F28

(A) terminal 1 and IPDM E/R harness connector E120 (B) termi-

nal 19.

3. Check continuity between starter motor harness connector F28

(A) terminal 1 and ground.

(+)

(-)

Condition

Voltage

Connector

Terminal

F28

1

Ground

Ignition in START

Battery voltage

AWBIA0125GB

A

B

Continuity

Connector

Terminal

Connector

Terminal

F28

1

E120

19

Yes

A

Continuity

Connector

Terminal

F28

1

Ground

No

AWBIA0126GB

S CONNECTOR CIRCUIT

STR-13

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

A

STR

N

P

O

Are the continuity test results as specified?

YES

>> Further inspection necessary. Refer to 

STR-5, "Work Flow"

.

NO

>> Repair the harness.

 

 

 

 

 

 

 

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