Nissan Altima L32. Manual - part 179

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< FUNCTION DIAGNOSIS >

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

FUNCTION DIAGNOSIS

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Description

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For information regarding the ASCD system, refer to 

EC-1090, "System Description"

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CHG-1

ELECTRICAL & POWER CONTROL

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SECTION 

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CONTENTS

CHARGING SYSTEM

BASIC INSPECTION  ....................................

2

DIAGNOSIS AND REPAIR WORKFLOW  ..........

2

Work Flow  .................................................................

2

FUNCTION DIAGNOSIS ...............................

5

CHARGING SYSTEM ..........................................

5

System Diagram ........................................................

5

System Description  ...................................................

5

Component Description ............................................

5

POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM .................................

6

System Diagram ........................................................

6

System Description  ...................................................

6

Component Description .............................................

6

COMPONENT DIAGNOSIS ..........................

7

CHARGING SYSTEM PRELIMINARY IN-
SPECTION ...........................................................

7

Inspection Procedure  ................................................

7

POWER GENERATION VOLTAGE VARI-
ABLE CONTROL SYSTEM OPERATION IN-
SPECTION ...........................................................

8

Inspection Procedure  ................................................

8

B TERMINAL CIRCUIT  ......................................

10

Description ..............................................................

10

Diagnosis Procedure ...............................................

10

L TERMINAL CIRCUIT .......................................

11

Description ..............................................................

11

Diagnosis Procedure ...............................................

11

S TERMINAL CIRCUIT  ......................................

12

Description ..............................................................

12

Diagnosis Procedure  ...............................................

12

CHARGING SYSTEM  .......................................

13

Wiring Diagram - Coupe  ..........................................

13

Wiring Diagram - Sedan  ..........................................

18

SYMPTOM DIAGNOSIS  ..............................

23

CHARGING SYSTEM  .......................................

23

Symptom Table  .......................................................

23

PRECAUTION ..............................................

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PRECAUTIONS .................................................

24

Supplemental Restraint System (SRS) "AIR BAG" 
and "SEAT BELT PRE-TENSIONER" .....................

24

Necessary for Steering Wheel Rotation After Bat-
tery Disconnect ........................................................

24

Precaution for Power Generation Voltage Variable 
Control System  ........................................................

24

PREPARATION ...........................................

26

PREPARATION .................................................

26

Special Service Tool ................................................

26

Commercial Service Tool  ........................................

26

ON-VEHICLE REPAIR .................................

27

GENERATOR ....................................................

27

Removal and Installation  .........................................

27

Inspection ................................................................

29

SERVICE DATA AND SPECIFICATIONS 
(SDS) ............................................................

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SERVICE DATA AND SPECIFICATIONS 
(SDS) .................................................................

30

Generator ................................................................

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< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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OVERALL SEQUENCE

DETAILED FLOW

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DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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NOTE:

To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done

as a set from start to finish.

1.

PRELIMINARY INSPECTION

Perform the preliminary inspection. Refer to 

CHG-7, "Inspection Procedure"

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>> GO TO 2

2.

DISABLE THE POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

Disable the power generation voltage variable control with either of the following procedures.

• After selecting “ENGINE” on the “SELECT SYSTEM” screen of CONSULT-III, set the “ALTERNATOR DUTY”

value to 0 % by selecting “ALTERNATOR DUTY” with “Active Test”. Continue “Active Test” until the end of

inspection. (When the DUTY value is 0 or 100 %, the normal power generation is performed according to the

characteristic of the IC regulator of the generator.)

• Turn the ignition switch OFF, disconnect the battery current sensor connector and leave it disconnected dur-

ing the course of the test.

NOTE:

Running the engine with the battery current sensor disconnected will cause DTC's (P1550-P1554) to set.

After finishing the inspection, connect the battery current sensor connector and erase the self-diagnostic

results history of the engine using CONSULT-III.

>> GO TO 3

3.

DIAGNOSIS WITH STARTING/CHARGING SYSTEM TESTER

Perform the charging system test using Starting/Charging System Tester (J-44373). For details and operating

instructions, refer to Technical Service Bulletin.
Test result

CHARGING SYSTEM NOMAL>>Charging system is normal and will also show “DIODE RIPPLE” test result.

NO CHARGING VOLTAGE>>GO TO 4

LOW CHARGING VOLTAGE>>GO TO 12

HIGH CHARGING VOLTAGE>>GO TO 14

DIODE RIPPLE NORMAL>>Diode ripple is OK and will also show “CHARGING VOLTAGE” test result.

EXCESS RIPPLE DETECTED>>Replace the generator. Perform “DIODE RIPPLE” test again using Starting/

Charging System Tester (J-44373) to confirm repair.

DIODE RIPPLE NOT DETECTED>>GO TO 4

4.

INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS ON)

Turn the ignition switch ON.
Does the charge warning lamp illuminate?

YES

>> GO TO 6

NO

>> GO TO 5

5.

TERMINAL“2” (OPEN) CIRCUIT INSPECTION

Check terminal “2” circuit for open circuits. Refer to 

CHG-11, "Diagnosis Procedure"

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Is the terminal “2” circuit normal?

YES

>> Replace generator. Refer to 

CHG-27, "Removal and Installation"

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NO

>> Repair as needed.

6.

INSPECTION WITH CHARGE WARNING LAMP (IDLING)

Start the engine and run it at idle.
Does the charge warning lamp turn OFF?

YES

>> GO TO 9

NO

>> GO TO 7

7.

TERMINAL “2”(SHORT) CIRCUIT INSPECTION

Check terminal “2” circuit for short to ground. Refer to 

CHG-11, "Diagnosis Procedure"

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Is the terminal “2” circuit normal?