Infiniti QX56 (Z62). Manual - part 1271

 

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Infiniti QX56 (Z62). Manual - part 1271

 

 

DIAGNOSIS AND REPAIR WORKFLOW

STR-13

< BASIC INSPECTION >

C

D

E

F

G

H

I

J

K

L

M

A

STR

N

P

O

YES

>> GO TO 8.

NO

>> Repair as needed.

8.

“S” CONNECTOR CIRCUIT INSPECTION

Check “S” connector circuit. Refer to 

STR-15, "Diagnosis Procedure"

.

Is “S” connector circuit normal?

YES

>> GO TO 9.

NO

>> Repair as needed.

9.

ENGINE ROTATION STATUS

Check that the engine can be rotated by hand.

Does the engine turn freely by hand?

YES

>> Replace starter motor.

NO

>> Perform further diagnosis of engine mechanical or powertrain mechanism. Once resolved, per-

form battery test again. Refer to Technical Service Bulletin. 

STR-14

< DTC/CIRCUIT DIAGNOSIS >

B TERMINAL CIRCUIT

DTC/CIRCUIT DIAGNOSIS

B TERMINAL CIRCUIT

Diagnosis Procedure

INFOID:0000000006275524

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 “B” TERMINAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Check that starter motor “B” terminal connection is clean and tight.

3.

Check voltage between starter motor “B” terminal and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check harness between battery and starter motor for open circuit.

2.

CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

1.

Shift A/T selector lever to “P” or “N” position.

2.

Check voltage between battery positive terminal and starter motor “B” terminal.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness between the battery and the starter motor for poor continuity.

3.

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

1.

Shift A/T selector lever to “P” or “N” position.

2.

Check voltage between starter motor case and battery negative terminal.

Is the inspection result normal?

YES

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

STR-11, "Work Flow"

.

NO

>> Check the starter motor case and ground for poor continuity.

(+)

(–)

Voltage

Starter motor “B” terminal

F57

2 Ground

Battery 

voltage

(+)

(–)

Condition

Voltage (V)

(Approx.)

Starter motor “B” terminal

Battery positive terminal

F57

When the ignition switch 

is in START position

Less than 0.5

(+)

(–)

Condition

Voltage (V)

(Approx.)

Starter motor case

Battery negative terminal

When the ignition switch is in START position

Less than 0.2

S CONNECTOR CIRCUIT

STR-15

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

A

STR

N

P

O

S CONNECTOR CIRCUIT

Diagnosis Procedure

INFOID:0000000006275525

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 “S” CONNECTOR CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect starter motor connector.

3.

Shift A/T selector lever to “P” or “N” position.

4.

Check voltage between starter motor harness connector and ground.

Is the inspection result normal?

YES

>> “S” connector circuit is OK. Further inspection is necessary. Refer to 

STR-11, "Work Flow"

.

NO

>> GO TO 2.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check continuity between starter motor harness connector and IPDM E/R harness connector.

Is the inspection result normal?

YES

>> Further inspection is necessary. Refer to 

SEC-48, "Work Flow"

NO

>> Repair the harness or connector.

(+)

(–)

Condition

Voltage

Starter motor

Connector

Terminal

F55

1 Ground

When the ignition switch 

is in START position

Battery voltage

Starter motor harness

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F55

1

E10

3

Existed

STR-16

< SYMPTOM DIAGNOSIS >

STARTING SYSTEM

SYMPTOM DIAGNOSIS

STARTING SYSTEM

Symptom Table

INFOID:0000000006275526

Symptom

Reference

No normal cranking

Refer to 

STR-11, "Work Flow"

.

Starter motor does not rotate

 

 

 

 

 

 

 

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