Infiniti M45 (Y34). Manual - part 9

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-29

[ASCD]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

2. 

CHECK ECM COMMUNICATION CIRCUIT

1.

Disconnect ASCD control unit connector and ECM connector.

2.

Check continuity between ASCD control unit harness connector
M35 terminal 7 (OR/B) and ECM harness connector F101 termi-
nal 39 (OR/B).

3.

Check continuity between ASCD control unit harness connector
M35 terminal 7 (OR/B) and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

3. 

CHECK ECM

1.

Check ECM.
Refer to 

EC-410, "DTC P0605 ECM"

 .

OK or NG

OK

>> Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

NG

>> Replace ECM.

TCS MONITOR CHECK

1. 

CHECK TCS MONITOR CIRCUIT

1.

Disconnect ASCD control unit connector and VDC/TCS/ABS
control unit connector.

2.

Check continuity between ASCD control unit harness connector
M35 terminal 2 (OR/L) and VDC/TCS/ABS control unit harness
connector E218 terminal 84 (OR/L).

3.

Check continuity between ASCD control unit harness connector
M35 terminal 2 (OR/L) and ground.

Refer to wiring diagram in 

ACS-10, "FIG. 3"

OK or NG

OK

>> GO TO 2.

NG

>> Repair harness or connector.

2. 

CHECK VDC/TCS/ABS CONTROL UNIT

●

Check VDC/TCS/ABS control unit. Refer to 

BRC-11, "TROUBLE DIAGNOSIS"

 .

OK or NG

OK

>> VDC/TCS/ABS control unit is OK.

NG

>> Replace VDC/TCS/ABS control unit.

7 - 39

: Continuity should exists

7 - ground

: Continuity should not 
exist

SKIA3062E

2 - 84

: Continuity should exists

2 - ground

: Continuity should not 
exist

SKIA3063E

ACS-30

[ASCD]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Electrical Component Inspection

AKS002PK

ASCD BRAKE SWITCH AND STOP LAMP SWITCH

Check each switch after adjusting brake pedal — refer to 

BR-6,

"BRAKE PEDAL"

 .

PARK/NEUTRAL POSITION RELAY

ASCD Wire Adjustment

AKS002PL

CAUTION:

●

Be careful not to twist ASCD wire when removing it.

●

Do not tense ASCD wire excessively during adjustment.

Adjust the tension of ASCD wire in the following manner.
1.

Loosen lock nut and adjusting nut.

2.

Make sure that accelerator wire is properly adjusted. Refer to 

ACC-2, "ACCELERATOR CONTROL SYS-

TEM"

 .

3.

Tighten adjusting nut just until throttle drum starts to move.

4.

Loosen adjusting nut again 1/2 to 1 turn.

5.

Tighten lock nut to specified torque holding the adjusting nut.

Continuity

ASCD brake switch

Stop lamp switch

When brake pedal is depressed

No

Yes

When brake pedal is released

Yes

No

PBIC0224E

Continuity

Between terminals 3 and 4

Battery voltage supply

No

Battery voltage not supply

Yes

PKIA2378E

SKIA3064E

SERVICE DATA AND SPECIFICATIONS (SDS)

ACS-31

[ASCD]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

SERVICE DATA AND SPECIFICATIONS (SDS)

PFP:00030

Standard and Limit

AKS002PM

Tightening Torque

AKS002PN

                                                                                                                                                                                  Unit: N·m (kg-m, ft-lb)
                                                                                                                                                                                  Unit: N·m (kg-m, in-lb)*

Turning back of ASCD cable adjusting nut 

1/2 - 1.0 turns (From position throttle drum just starts to move)

ASCD cable lock nut

                                7.9 - 9.8 (0.8 - 1.0, 70 - 87)*

ASCD actuator

Bolt

                             4.4 - 5.8 (0.45 - 0.59, 39 - 51)*

Nut

                              10.8 - 13.7 (1.1 - 1.3, 8 - 10)

ASCD control unit

                             2.9 - 3.9 (0.30 - 0.39, 26 - 34)*

ACS-32

[ICC]

PRECAUTIONS

[ICC]

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT 
BELT PRE-TENSIONER”

AKS004EP

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

●

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

●

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

●

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for ICC System Service

AKS002PP

●

Do not look straight into the laser beam discharger when adjusting laser beam aiming.

●

Turn the ON/OFF switch OFF in conditions similar to driving, suchlike Free rollers or a chassis dynamom-
eter.

●

Do not use the ICC sensor removing from vehicle, disassemble, or remodel the sensor.

●

Erase DTCs when replacing parts of ICC system, then check the operation of ICC system after adjusting
laser beam aiming if necessary.

Wiring Diagrams and Trouble Diagnosis 

AKS002PQ

When you read wiring diagrams, refer to the followings:

●

Refer to 

GI-14, "How to Read Wiring Diagrams"

  in GI section

●

Refer to 

PG-2, "POWER SUPPLY ROUTING"

  for power distribution circuit in PG section

When you perform trouble diagnosis, refer to the followings:

●

Refer to 

GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"

  in GI section

●

Refer to 

GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

  in GI section