Nissan Titan. Manual — part 576

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< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow (Without GR8-1200 NI)

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OVERALL SEQUENCE

DETAILED FLOW

NOTE:

If any malfunction is found, immediately disconnect the battery cable from the negative terminal.

1.

CHECK ENGINE START

Crank the engine and check that the engine starts.
Does the engine start?

YES

>> GO TO 2.

NO

>> GO TO 3.

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DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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2.

CHECK THAT THE STARTER MOTOR STOPS

Check that the starter motor stops after starting the engine.
Does the starter motor stop?

YES

>> Inspection End.

NO

>> Replace starter motor. Refer to

STR-19, "Removal and Installation"

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3.

CHECK THAT THE ENGINE TURNS WHEN CRANKING

Check that the engine turns when cranking.
Does engine turn when cranking?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

CHECK THE ENGINE SPEED WHEN CRANKING

Check that the engine speed is not low when cranking.
Does engine turn normally?

YES

>> Check ignition/fuel system.

NO

>> Check charge condition, corrosion and connection condition of the battery. Refer to

PG-4, "How to

Handle Battery"

.

5.

CHECK STARTER MOTOR ACTIVATION

Check that the starter motor runs at cranking.
Does starter motor turn?

YES

>> Replace starter motor. Refer to

STR-19, "Removal and Installation"

.

NO

>> GO TO 6.

6.

CHECK POWER SUPPLY CIRCUIT

Check the following conditions:

• Fuse and fusible link

• Charge condition, corrosion and connection of the battery.
Are these inspection results normal?

YES

>> GO TO 7.

NO

>> Repair as needed.

7.

CHECK STARTING SYSTEM WIRING

Check the following:

• “B” terminal circuit. Refer to

STR-12, "Diagnosis Procedure"

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• “S” terminal circuit. Refer to

STR-13, "Diagnosis Procedure"

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Are the inspection results normal?

YES

>> Replace starter motor. Refer to

STR-19, "Removal and Installation"

.

NO

>> Repair as needed.

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< SYSTEM DESCRIPTION >

STARTING SYSTEM

SYSTEM DESCRIPTION

STARTING SYSTEM

System Diagram

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System Description

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The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The

starter motor is grounded to the cylinder block. With power and ground supplied, the starter motor operates.

Component Parts Location

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1.

A/T assembly
F9 (floor shift)
F17 (column shift)

2.

IPDM E/R E119, E120, E122, E124

3.

BCM M18 (view with instrument panel
lower LH panel removed)

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STARTING SYSTEM

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< SYSTEM DESCRIPTION >

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Component Description

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Component part

Description

TCM

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

BCM

BCM sends a starter request signal to the CPU of the IPDM E/R
over the CAN communication lines.

IPDM E/R

CPU inside IPDM E/R operates the starter relay at the request of
the BCM over the CAN communication lines.

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.