Infiniti M45 (Y34). Manual - part 7

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-21

[ASCD]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

2. 

CHECK STOP LAMP SWITCH CIRCUIT

With CONSULT-II

See “STOP LAMP” in “DATA MONITOR” mode.

Without CONSULT-II

1.

Disconnect ASCD control unit connector.

2.

Check voltage between ASCD control unit harness connector
M35 terminal 23 (R/W) and ground.

Refer to wiring diagram in 

ACS-10, "FIG. 3"

 .

OK or NG

OK

>> ASCD brake/stop lamp switch is OK.

NG

>> Check the following.

●

15A fuse [No. 17, located in the fuse block (J/B) NO.1]

●

Harness for open or short between ASCD control unit and stop lamp switch

●

Harness for open or short between fuse and stop lamp switch

●

Stop lamp switch
Refer to 

ACS-30, "Electrical Component Inspection"

 .

When brake pedal is released

: STOP LAMP SW   OFF

When brake pedal is depressed

: STOP LAMP SW   ON

PBIC0207E

When brake pedal is released

: 0V

When brake pedal is depressed

: Approx. 12 V

PBIC0208E

ACS-22

[ASCD]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ASCD STEERING SWITCH CHECK

1. 

CHECK ASCD STEERING SWITCH CIRCUIT FOR ASCD CONTROL UNIT

With CONSULT-II

See “MAIN SW”, “RESUME/ACC SW”, “SET SW” and “CANCEL
SW” in “DATA MONITOR” mode.

Without CONSULT-II

1.

Turn ignition switch ON.

2.

Check voltage between ASCD control unit harness connector
M35 terminal 11 (G/OR) and 24 (G).

Refer to wiring diagram in 

ACS-11, "FIG. 4"

 .

OK or NG

OK

>> ASCD steering switch is OK.

NG

>> GO TO 2.

MAIN SW, RESUME/ACC SW, 
SET SW and CANCEL SW

When switch is depressed:

ON

When switch is released:

OFF

PBIC0209E

Switch

Condition

Voltage [V]

MAIN (CRUISE) SW

 Depressed

                       0

Released

                Approx. 4.0

SET/COAST SW

 Depressed 

                Approx. 2.0

Released

                Approx. 4.0

RESUME/ACCEL SW

 Depressed

                Approx. 3.0

Released

                Approx. 4.0

CANCEL SW

 Depressed

                Approx. 1.0

Released

                Approx. 4.0

PKIA2588E

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-23

[ASCD]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

2. 

CHECK ASCD STEERING SWITCH

1.

Disconnect ASCD steering switch.

2.

Check resistance between ASCD steering switch terminals 1
and 2 by depressing each switch.

OK or NG

OK

>> Check harness for open or short between ASCD steering switch and ASCD control unit.

NG

>> Replace ASCD steering switch.

Switch

Condition

Resistance [

Ω

]

MAIN (CRUISE) SW

           Depressed

             Approx. 0.3

           Released

             Approx. 4,000

SET/COAST SW

           Depressed

             Approx. 661

           Released

             Approx. 4,000

RESUME/ACCEL SW

           Depressed

             Approx. 1,486

           Released

             Approx. 4,000

CANCEL SW

           Depressed

             Approx. 249

           Released

             Approx. 4,000

SKIA3061E

ACS-24

[ASCD]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

VEHICLE SPEED SENSOR CHECK

1. 

CHECK SPEEDOMETER OPERATION

Does speedometer operate normally?

Yes

>> GO TO 2.

No

>> Check speedometer and vehicle speed sensor circuit. Refer to 

DI-16, "Vehicle Speed Signal

Inspection"

  and 

AT-43, "TROUBLE DIAGNOSIS"

 .

2. 

CHECK VEHICLE SPEED INPUT

With CONSULT-II

See “VHCL SPEED SE” in “DATA MONITOR” mode while driving.

NOTE:

●

This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.

●

Always drive vehicle in safe speed and manner according to traffic conditions and obey all traffic laws.

Without CONSULT-II

1.

Apply wheel chocks and jack up drive wheels.

2.

Disconnect ASCD control unit connector.

3.

Turn ignition switch ON.

4.

Check voltage between ASCD control unit harness connector
M35 terminal 22 (PU/W) and ground with turning drive wheels
slowly by hand.

Refer to wiring diagram in 

ACS-12, "FIG. 5"

 .

Yes or No

Yes

>> Vehicle speed sensor is OK.

No

>> Check harness for open or short between ASCD control unit and combination meter.

Is actual vehicle speed indicated?

PBIC0212E

Dose voltage pointer deflect?

PBIC0213E