Nissan Altima L32. Manual - part 1409

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STARTING SYSTEM

FUNCTION DIAGNOSIS

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.  

AWBIA0742GB

STARTING SYSTEM

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Component Description

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Component part

Description

TCM (CVT models)

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.

Clutch interlock switch (M/T models)

The switch turns ON and electric power is supplied to the starter 
relay and starter control relay inside IPDM E/R when the clutch 
pedal is depressed.

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.

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B TERMINAL CIRCUIT

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 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 B POWER SUPPLY VOLTAGE

1. Turn ignition switch OFF.

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

3. Check voltage between starter motor connector F27 terminal B

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 CVT selector lever to “P” or “N” position. (CVT models)

Press and hold the clutch pedal fully with the control lever in neutral. (M/T models)

2. Check voltage between battery positive terminal and starter

motor connector F27 terminal B while cranking the engine.

Is the voltage drop less than 0.5V?

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)

1. Shift CVT selector lever to “P” or “N” position. (CVT models)

Press and hold the clutch pedal fully with the control lever in neutral. (M/T models)

2. Check voltage between starter motor case and battery negative

terminal while cranking the engine.

Is the voltage drop less than 0.2V?

YES

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

Refer to 

STR-29, "Work Flow"

.

NO

>> Check the starter motor case to engine mounting for

high resistance.

B - ground

Battery voltage

WKIA0137E

While cranking the engine

Terminal B - B+ terminal

Less than 0.5V

WKIA0138E

While cranking the engine

Starter case - B- terminal

Less than 0.2V

WKIA0139E

S CONNECTOR CIRCUIT

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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 (CVT models) or the clutch pedal is fully depressed (M/T

models).

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 F28.

3. Shift CVT selector lever to “P” or “N” position. (CVT models)

Press and hold the clutch pedal fully with the control lever in

neutral. (M/T models)

4. Check voltage between starter motor harness connector F28

terminal S and ground with the ignition in START.

Is battery voltage present?

YES

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

STR-29, "Work Flow"

.

NO

>> GO TO 2

2.

CHECK CONNECTOR

1. Turn ignition switch OFF.

2. Check the following terminals and connectors for damage, bent pins and loose connections.

-

IPDM E/R harness connector F10

-

Starter motor harness connector F28

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair the terminal and connector.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1. Disconnect the following harness connectors.

-

IPDM E/R connector F10

-

Starter motor connector F28

2. Check continuity between starter motor harness connector F28

terminal S and IPDM E/R harness connector F10 terminal 80.

Is there proper continuity between the two pins?

YES

>> Further inspection necessary. Refer to 

STR-29, "Work

Flow"

.

NO

>> Repair the harness.

With ignition switch in START

S - ground

Battery voltage

ALBIA0503GB

S - 80

Continuity exists

ALBIA0504GB