Infiniti EX35. Manual - part 1400

STR-6

< FUNCTION DIAGNOSIS >

STARTING SYSTEM

Component Parts Location

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Component Description

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1.

Starter motor

2.

BCM

3.

IPDM E/R

4.

Battery

5.

TCM

A.

Engine

B.

Dash side lower (Passenger side)

C.

Engine room dash panel (RH)

D.

Inside of A/T (built into A/T)

JPBIA0402GB

Component part

Description

TCM

TCM supplies power to the starter relay and starter control relay 
inside IPDM E/R when the selector lever is shifted to the P or N 
position.

BCM

BCM controls the starter relay inside IPDM E/R.

IPDM E/R

CPU inside IPDM E/R controls the starter control relay.

Starter motor

The starter motor plunger closes and the motor is supplied with 
battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.

B TERMINAL CIRCUIT

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COMPONENT DIAGNOSIS

B TERMINAL CIRCUIT

Description

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The “B” terminal is constantly supplied with battery power.

Diagnosis Procedure

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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-2, "Work Flow"

.

NO

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

Terminals

Voltage (Approx.)

(+)

(–)

Starter motor “B” terminal

Terminal

E204

2 Ground

Battery 

voltage

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor

“B” terminal

Terminal

Battery positive terminal

E204

2 

When the ignition switch is 

in START position

Less than

 0.5 V

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor case

Battery negative terminal

When the ignition switch is in 

START position

Less than 0.2 V

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< COMPONENT DIAGNOSIS >

S CONNECTOR CIRCUIT

S CONNECTOR CIRCUIT

Description

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The starter motor magnetic switch is supplied with power when the ignition switch is turned to the START posi-
tion while the selector lever is in the P or N position.

Diagnosis Procedure

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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-2, "Work Flow"

.

NO

>> GO TO 2.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect IPDM E/R connector.

2.

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 

STR-2, "Work Flow"

. 

NO

>> Repair the harness.

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor har-

ness connector

Terminal

F52

1 Ground

When the ignition switch is in 

START position

Battery voltage

Starter motor harness connector

IPDM E/R harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

F52

1

E7

80

Existed

STARTING SYSTEM

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STARTING SYSTEM

Wiring Diagram - STARTING SYSTEM -

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JCBWM0488GB