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ACS

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K ELECTRICAL

B
SECTION
AUTO CRUISE CONTROL SYSTEM C

E
CONTENTS
QG18DE CHECK ............................................................... 15
. F
ASCD BRAKE/STOP LAMP SWITCH CHECK ... 16
PRECAUTIONS ......................................................... 2 . ASCD STEERING SWITCH CHECK ................. 18 .
Precautions for Supplemental Restraint System VEHICLE SPEED SENSOR CHECK ................. 19 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- ASCD MOTOR ACTUATOR CIRCUIT CHECK... 19
SIONER" ................................................................. 2
. ASCD MOTOR ACTUATOR CHECK ................. 21 .
Wiring Diagrams and Trouble Diagnosis ................. 2 . Electrical Component Inspection ........................... 22 .
AUTOMATIC SPEED CONTROL DEVICE (ASCD) 3 ..... H
ASCD STEERING SWITCH ............................... 22 .
Component Parts and Harness Connector Location 3 ..... ASCD BRAKE SWITCH AND STOP LAMP
System Description ................................................. 5 . SWITCH ............................................................. 22
.
POWER SUPPLY AND GROUND ....................... 5 . ASCD CLUTCH SWITCH (M/T) ......................... 22 . I
OPERATION ........................................................ 5 . PARK/NEUTRAL POSITION SWITCH (A/T) ...... 22 .
ASCD MOTOR ACTUATOR OPERATION .......... 6 . PARK/NEUTRAL POSITON (PNP) RELAY ........ 23 .
Schematic ............................................................... 7
. ASCD Wire Adjustment ......................................... 23 . J
Wiring Diagram -- ASCD -- ................................... 8 .
FIG. 1 .................................................................... 8
.
FIG. 2 .................................................................... 9
.
QR25DE
FIG. 3 .................................................................. 10
. ACS
PRECAUTIONS ....................................................... 24 .
FIG. 4 ...................................................................11
. Precautions for Supplemental Restraint System
Fail-safe System ................................................... 12 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
DESCRIPTION ................................................... 12 . SIONER" ................................................................ 24
. L
MALFUNCTION DETECTION CONDITIONS .... 12 . Wiring Diagrams and Trouble Diagnosis ............... 24 .
Trouble Diagnoses ................................................ 13 . AUTOMATIC SPEED CONTROL DEVICE (ASCD)... 25
SYMPTOM CHART ............................................ 13 . Description ............................................................. 25
. M
FAIL-SAFE SYSTEM CHECK ............................ 14 .
POWER SUPPLY AND GROUND CIRCUIT

ACS-1
PRECAUTIONS
[QG18DE]
PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS0043V

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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
q 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.
q 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.
q 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 harness connec-
tors.
Wiring Diagrams and Trouble Diagnosis EKS0043R

When you read wiring diagrams, refer to the following:
q GI-13, "How to Read Wiring Diagrams"
q PG-2, "POWER SUPPLY ROUTING"
When you perform trouble diagnosis, refer to the following:
q GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
q GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"
Check for any Service bulletins before servicing the vehicle.

ACS-2
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD) PFP:18930
A
Component Parts and Harness Connector Location EKS002CK

ACS

WKIA0002E

ACS-3
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]

WKIA0003E

ACS-4
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
System Description EKS002CL

A
Refer to Owner's Manual for ASCD operating instructions.
POWER SUPPLY AND GROUND
Power is supplied at all times: B
q through 10A fuse [No. 2, located in the fuse block (J/B)]
q to the stop lamp switch terminal +.
When ignition switch is in the ON or START position, power is supplied: C
q through 10A fuse [No. 10, located in the fuse block (J/B)]
q to ASCD control unit terminal 5.
D
q through 10A fuse [No. 20, located in the fuse block (J/B)]
q to park/neutral position relay terminal 1
q through 10A fuse [No. 30, located in the fuse block (J/B)] E
q to combination meter terminals 6 and 21.
When park/neutral position switch (A/T) is in the P or N position, ground is supplied:
q to park/neutral position (PNP) relay terminal 2 F
q through body grounds F33, F35, and F37.
When ASCD CRUISE/ONqOFF switch is depressed (ON), ground is supplied:
q to ASCD control unit terminal 11 G
q from ASCD steering switch terminal 4
q to ASCD steering switch terminal 1
H
q from ASCD control unit terminal 24.
Then ASCD control unit illuminates CRUISE indicator.
Ground is supplied:
I
q to combination meter terminal 22
q from ASCD control unit terminal 15.
Ground is supplied: J
q to ASCD control unit terminal 17
q through body grounds M28 and M54.
ACS
OPERATION
Set Operation
To activate the ASCD, all of following conditions must exist: L
q ASCD control unit receives ASCD CRUISE/ONqOFF switch ON signal
q Power supply to ASCD control unit terminal 8 [Brake and clutch pedal is released (M/T), and brake pedal
is released and A/T selector lever is in other than P and N position. (A/T)] M
q Vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH). (Signal from combination meter)
When the SET/COAST switch is depressed, ground is supplied:
q to ASCD control unit terminal 11
q from ASCD steering switch terminal 4.
Then ASCD motor actuator is activated to control throttle wire and ASCD control unit supplies ground:
q to combination meter terminal 7 to illuminate SET indicator.
A/T Overdrive Control During Cruise Control Driving (A/T)
When the vehicle speed is approximately 5 km/h (3 MPH) below set speed, a signal is sent:
q from ASCD control unit terminal 10
q to TCM terminal 24.
When this occurs, the TCM cancels overdrive.
When vehicle speed returns to approximately 0.6 km/h (0.4 MPH) below set speed, overdrive is reactivated.

ACS-5
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Coast Operation
When the SET/COAST switch is depressed during cruise control driving, ASCD motor actuator returns the
throttle cable to decrease vehicle set speed until the switch is released. Then ASCD will keep the new set
speed.
If SET/COAST switch is pressed and released quickly during cruise control driving, vehicle set speed will be
reduced by 1.6 km/h (1.0 MPH).
Accel Operation
When the ACCEL/RES switch is depressed, ground is supplied:
q from ASCD steering switch terminal 4
q to ASCD control unit terminal 11.
If the ACCEL/RES switch is depressed during cruise control driving, ASCD motor actuator pulls the throttle
cable to increase the vehicle speed until the switch is released or vehicle speed reaches maximum controlled
speed by the system. Then ASCD will keep the new set speed.
If ACCEL/RES switch is pressed and released quickly during cruise control driving, vehicle set speed will be
increased by 1.6 km/h (1.0 MPH).
Cancel Operation
When any of following conditions exist, cruise operation will be canceled:
q CANCEL switch is depressed. (Ground is supplied to ASCD control unit terminal 11)
q Brake pedal is depressed. (Power is supplied to ASCD control unit terminal 23 from stop lamp switch)
q Brake or clutch pedal is depressed (M/T), brake pedal is depressed or A/T selector lever is shifted to P or
N position (A/T). (Power supply to ASCD control unit terminal 8 is interrupted.)
If CRUISE/ONqOFF switch is turned to OFF when ASCD is activated, all of ASCD operation will be canceled
and vehicle speed memory will be erased.
Resume Operation
When the ACCEL/RES switch is depressed, after cancel operation other than depressing CRUISE/ONqOFF
switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition
must meet following conditions:
q Brake pedal is released.
q Clutch pedal is released (M/T).
q A/T selector lever is in other than P and N position (A/T).
q Vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH).
ASCD MOTOR ACTUATOR OPERATION
When the ASCD activates, power is supplied:
q from terminal 7 of ASCD control unit
q to ASCD motor actuator terminal 1, and
q from terminal 12 of ASCD control unit
q to ASCD motor actuator terminal 6.
Ground is supplied:
q from ASCD control unit terminals 1, 13, and 14
q to terminals 3, 5, and 2 of ASCD motor actuator.
Power to the actuator motor is supplied constantly from the ASCD control unit. The ASCD control unit then
switches the actuator motor ground signals ON and OFF to control actuator motor operation and vehicle
speed.

ACS-6
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Schematic EKS002CM

ACS

WKWA0008E

ACS-7
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Wiring Diagram -- ASCD -- EKS002CN

FIG. 1

WKWA0009E

LEL601

ACS-8
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
FIG. 2
A

ACS

L
WKWA0010E

WEL431A

ACS-9
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
FIG. 3

WKWA0011E

LEL602

ACS-10
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
FIG. 4
A

ACS

WKWA0012E

WEL098A

ACS-11
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Fail-safe System EKS002CO

DESCRIPTION
When the fail-safe system senses a malfunction, it deactivates
ASCD operation. The SET indicator in the combination meter will
then flash.

SEL255W

MALFUNCTION DETECTION CONDITIONS
ASCD operation during malfunc-
Detection conditions
tion detection
q ASCD steering (ACCEL/RES, CANCEL, SET/COAST) switch is stuck. q ASCD is deactivated.
q ASCD motor actuator ground circuit or power circuit is open or shorted. q Vehicle speed memory is can-
q ASCD motor actuator has internal malfunction. celed.
q Vehicle speed sensor is faulty.
q ASCD control unit internal circuit is malfunctioning.
q ASCD brake switch or stop lamp switch is faulty. q ASCD is deactivated.
q Vehicle speed memory is not
canceled.

ACS-12
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Trouble Diagnoses EKS002CP

SYMPTOM CHART A
PROCEDURE Diagnostic procedure
REFERENCE PAGE (ACS- ) ACS-14 ACS-15 ACS-16 ACS-18 ACS-19 ACS-19 ACS-21
B

POWER SUPPLY AND GROUND CIRCUIT CHECK

ASCD MOTOR ACTUATOR CIRCUIT CHECK
ASCD BRAKE/STOP LAMP SWITCH CHECK
C

VEHICLE SPEED SENSOR CHECK

ASCD MOTOR ACTUATOR CHECK
ASCD STEERING SWITCH CHECK
D

FAIL-SAFE SYSTEM CHECK
SYMPTOM
E

G
ASCD cannot be set. ("CRUISE" indicator
X X*3
lamp does not turn ON.)
ASCD cannot be set. ("SET" indicator lamp H
X X X
does not turn ON.)
ASCD cannot be set. ("SET" indicator lamp
X X X X X
blinks.*1) I
Vehicle speed does not decrease after SET/
X X
COAST switch has been pressed.
Vehicle speed does not return to the set J
speed after ACCEL/RES switch has been X X
pressed.*2
Vehicle speed does not increase after ACS
X X
ACCEL/RES switch has been pressed.
System is not released after CANCEL switch
X X
(steering) has been pressed.
L
Large difference between set speed and
X X X
actual vehicle speed.
Deceleration is greatest immediately after
X X X M
ASCD has been set.
X: Applicable
*1: It indicates that system is in fail-safe. After completing diagnostic procedures, perform ACS-14, "FAIL-SAFE SYSTEM CHECK" to
verify repairs.
*2: If vehicle speed is greater than 40 km/h (25 MPH) after system has been released, pressing ACCEL/RES switch returns vehicle
speed to the set speed previously achieved. However, doing so when the CRUISE ONqOFF main switch is turned to "OFF", vehicle
speed will not return to the set speed since the memory is canceled.
*3: Check only CRUISE ONqOFF switch built-in steering switch.

ACS-13
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
FAIL-SAFE SYSTEM CHECK
1. Turn ignition switch to ON position.
2. Turn CRUISE ONqOFF switch to ON and check if the "SET"
indicator blinks.
If the indicator lamp blinks, check the following.
q ASCD steering switch. Refer to ACS-22, "ASCD STEERING
SWITCH" .

SEL417V

3. Drive the vehicle at more than 40 km/h (25 MPH) and push SET/
COAST switch.
If the indicator lamp blinks, check the following.
q Vehicle speed sensor. Refer to ACS-19, "VEHICLE SPEED
SENSOR CHECK" .
q ASCD motor actuator circuit. Refer to ACS-19, "ASCD
MOTOR ACTUATOR CIRCUIT CHECK" .
q Replace control unit.

4. Drive the vehicle at more than 20 km/h (12 MPH).
If the indicator lamp blinks, replace the following. SEL767P
q ASCD motor actuator.

5. Depress brake pedal slowly (brake pedal should be depressed
more than 5 seconds).
If the indicator lamp blinks, check the following.
q ASCD brake/stop lamp switch. Refer to ACS-16, "ASCD
BRAKE/STOP LAMP SWITCH CHECK" .
6. END. (System is OK.)

SAT797A

ACS-14
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
POWER SUPPLY AND GROUND CIRCUIT CHECK
A
1. CHECK POWER SUPPLY CIRCUIT FOR ASCD CONTROL UNIT
1. Disconnect ASCD control unit harness connector. B
2. Turn ignition switch ON.
3. Check voltage between ASCD control unit harness connector terminal 5 and ground.
C

LEL516
F
Refer to ACS-8, "FIG. 1" .

G
Yes >> GO TO 2.
No >> Check the following.
q 10A fuse (No. 10 located in the fuse block)
H
q Harness for open or short

2. CHECK GROUND CIRCUIT FOR ASCD CONTROL UNIT I
Check continuity between ASCD control unit harness connector terminal 17 and body ground.

ACS

LEL517

Refer to ACS-8, "FIG. 1" . M

Yes >> Power supply and ground circuit is OK.
No >> Repair harness.

ACS-15
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
ASCD BRAKE/STOP LAMP SWITCH CHECK

1. CHECK ASCD BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD control unit harness connector.
3. Check continuity between ASCD control unit harness connector terminal 8 and terminal 12.

LEL518

OK or NG
OK >> GO TO 2.
NG >> Check the following.
q ASCD brake switch
Refer to ACS-22, "ASCD BRAKE SWITCH AND STOP LAMP SWITCH" .
q Park/neutral position switch (A/T)
Refer to ACS-22, "PARK/NEUTRAL POSITION SWITCH (A/T)" .
q Park/neutral position relay (A/T)
Refer to ACS-23, "PARK/NEUTRAL POSITON (PNP) RELAY" .
q ASCD clutch switch (M/T)
Refer to ACS-22, "ASCD CLUTCH SWITCH (M/T)" .
q Harness for open or short

q ASCD control unit

ACS-16
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
2. CHECK STOP LAMP SWITCH CIRCUIT A
1. Disconnect ASCD control unit harness connector.
2. Check voltage between ASCD control unit harness connector terminal 23 and ground.
B

LEL519
E
Refer to ACS-8, "FIG. 1" .
OK or NG
F
OK >> ASCD brake/stop lamp switch is OK.
NG >> Check the following.
q 10A fuse [No. 2, located in the fuse block (J/B)]
G
q Harness for open or short between ASCD control unit and stop lamp switch

q Harness for open or short between fuse and stop lamp switch

q Stop lamp switch H
Refer to ACS-22, "ASCD BRAKE SWITCH AND STOP LAMP SWITCH" .

ACS

ACS-17
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
ASCD STEERING SWITCH CHECK

1. CHECK ASCD STEERING SWITCH CIRCUIT FOR ASCD CONTROL UNIT
Check resistance between ASCD control unit harness connector terminals.

LEL520

Refer to ACS-9, "FIG. 2" .
OK or NG
OK >> ASCD steering switch is OK.
NG >> GO TO 2.

2. CHECK CIRCUIT CONTINUITY
1. Disconnect ASCD steering switch and ASCD control unit connector.
2. Check continuity between ASCD steering switch connector terminals 1 (4) and ASCD control unit connec-
tor terminal 24 (11).

LEL521

Refer to ACS-9, "FIG. 2" .
OK or NG
OK >> Replace ASCD steering switch.
NG >> Repair or replace harness or connectors.

ACS-18
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
VEHICLE SPEED SENSOR CHECK
A
1. CHECK SPEEDOMETER OPERATION
Refer to ACS-8, "FIG. 1" . B
Does speedometer operate normally?
Yes >> GO TO 2.
No >> Check speedometer and vehicle speed sensor circuit. Refer to DI-15, "Trouble Diagnoses" . C

2. CHECK VEHICLE SPEED INPUT
D
1. Apply wheel chocks and jack up drive wheel.
2. Disconnect ASCD control unit harness connector.
3. Check voltage between control unit terminal 22 and ground while turning drive wheel slowly by hand. E

H
LEL522

Yes or No?
Yes >> Vehicle speed sensor is OK. I
No >> Check harness for open or short between ASCD control unit terminal 22 and combination meter
terminal 13.
ASCD MOTOR ACTUATOR CIRCUIT CHECK J

1. CHECK ASCD MOTOR ACTUATOR (CLUTCH) ACS
1. Disconnect ASCD motor actuator connector.
2. Measure resistance between ASCD motor actuator terminals 1 and 4.
L

LEL618

Refer to ACS-9, "FIG. 2" .
OK or NG
OK >> GO TO 2.
NG >> Replace ASCD motor actuator.

ACS-19
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
2. CHECK ASCD MOTOR ACTUATOR (MOTOR)
1. Disconnect ASCD motor actuator connector.
2. Measure resistance between ASCD motor actuator terminal 6 and terminals 2, 3, and 5.
Terminals Resistance () Approx.
2
6 3 5.2
5

OK or NG
OK >> Check the following.
q Harness for open or short between ASCD motor actu-
ator and ASCD control unit
WKIA0358E
q ASCD motor actuator (clutch) ground circuit

NG >> Replace ASCD motor actuator.

ACS-20
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
ASCD MOTOR ACTUATOR CHECK
A
1. CHECK ASCD WIRE
Check wire for improper installation, rust formation or breaks. B

E
LEL620

OK or NG
OK >> Replace ASCD motor actuator. F
NG >> Repair or replace wire. Refer to ACS-23, "ASCD Wire Adjustment" .

ACS

ACS-21
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
Electrical Component Inspection EKS002CQ

ASCD STEERING SWITCH
Check continuity between terminals by pushing each button.
Button Terminals Resistance (Approx.)
CRUISE/ONqOFF 0 k
SET/COAST 1.47 - 1.53 k
1-4
ACCEL/RES 3.24 - 3.36 k
CANCEL 5.00 - 5.20 k

LEL523

ASCD BRAKE SWITCH AND STOP LAMP SWITCH
Continuity
Condition ASCD brake
Stop lamp switch
switch
When brake pedal is depressed No Yes
When brake pedal is released Yes No

Check brake pedal adjustment after checking each switch.
Refer to BR-12, "Adjustment" .

LEL524

ASCD CLUTCH SWITCH (M/T)
Condition Continuity
When clutch pedal is depressed No
When clutch pedal is released Yes

LEL525

PARK/NEUTRAL POSITION SWITCH (A/T)
Continuity
A/T selector lever position
Between terminals 1 and 2
"P" Yes
"N" Yes
Except "P" and "N" No

LEL526

ACS-22
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QG18DE]
PARK/NEUTRAL POSITON (PNP) RELAY
Check continuity between terminals 3 and 4, 6 and 7. A

Condition Continuity
Between terminals 6 and B
12V direct current supply between terminals 1 and 2
7
Between terminals 3 and
No current supply
4
C

LEL644
D

ASCD Wire Adjustment EKS002CR

J
LEL569

CAUTION:
q Be careful not to twist ASCD wire when removing it. ACS
q Do not tense ASCD wire excessively during adjustment.
Adjust the tension of ASCD wire in the following manner.
L
1. Loosen lock nut and adjusting nut.
2. Make sure that accelerator wire is properly adjusted. Refer to ACC-2, "Adjusting Accelerator Wire" .
3. Tighten adjusting nut just until throttle drum starts to move. M
4. Loosen adjusting nut again 1/2 to 1 turn.
5. Tighten lock nut.

ACS-23
PRECAUTIONS
[QR25DE]
PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS0043U

ACS-24
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QR25DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD) PFP:18930
A
Description EKS002CS

Regarding the information for ASCD system, refer to EC-1850, "AUTOMATIC SPEED CONTROL DEVICE
(ASCD)" (QR25DE engine models). B

ACS

ACS-25
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[QR25DE]

ACS-26

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