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AUTO CRUISE CONTROL SYSTEM

K ELECTRICAL

B
SECTION
AUTO CRUISE CONTROL SYSTEM C

E
CONTENTS
ASCD ASCD BRAKE SWITCH AND STOP LAMP F
SWITCH ............................................................. 29
.
PRECAUTIONS ......................................................... 3 . PARK/NEUTRAL POSITION RELAY ................. 29 .
Precautions for Supplemental Restraint System ASCD Wire Adjustment ......................................... 29 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SERVICE DATA AND SPECIFICATIONS (SDS) ..... 30 .
SIONER" ................................................................. 3
. Standard and Limit ................................................. 30
.
Wiring Diagrams and Trouble Diagnosis ................. 3 . Tightening torque ................................................... 30
.
AUTOMATIC SPEED CONTROL DEVICE (ASCD) 4 ..... H
Component Parts and Harness Connector Location 4 .....
System Description ................................................. 4 .
ICC
POWER SUPPLY AND GROUND ....................... 4 . PRECAUTIONS ....................................................... 31 . I
OPERATION ........................................................ 5 . Precautions for Supplemental Restraint System
ASCD PUMP OPERATION .................................. 6 . (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
Schematic ............................................................... 7
. SIONER" ................................................................ 31
. J
Wiring Diagram -- ASCD -- ................................... 8 . Precautions for ICC System Service ..................... 31 .
FIG. 1 .................................................................... 8
. Wiring Diagrams and Trouble Diagnosis ............... 31 .
FIG. 2 .................................................................... 9
. PREPARATION ........................................................ 32 .
FIG. 3 .................................................................. 10
. ACS
Special Service Tools ............................................ 32 .
FIG. 4 ...................................................................11
. DESCRIPTION ......................................................... 33 .
FIG. 5 .................................................................. 12
. Outline ................................................................... 33
.
FIG. 6 .................................................................. 13
. System Diagram .................................................... 33 . L
Fail-Safe System ................................................... 13 . Components Description ....................................... 33 .
DESCRIPTION ................................................... 13 . CAN Communication ............................................. 34 .
MALFUNCTION DETECTION CONDITIONS .... 14 . SYSTEM DIAGRAM ........................................... 34 . M
CONSULT-II Inspection Procedure ....................... 14 . INPUT/OUT SIGNAL CHART ............................. 34 .
CONSULT-II Self-diagnostic Results ..................... 15 . Switch Operation ................................................... 35 .
CONSULT-II Data Monitor ..................................... 16 . ICC System Display ............................................... 35 .
Trouble Diagnoses ................................................ 17 . ACTION TEST .......................................................... 37.
SYMPTOM CHART ............................................ 17 . ICC system running test ........................................ 37 .
FAIL-SAFE SYSTEM CHECK ............................ 18 . ICC SYSTEM SET CHECKING ......................... 37 .
POWER SUPPLY AND GROUND CIRCUIT CHECK FOR INCREASE OF THE CRUISING
CHECK ............................................................... 19
. SPEED ............................................................... 37
.
ASCD BRAKE/STOP LAMP SWITCH CHECK ... 20 CHECK FOR DECREASE OF THE CRUISING
ASCD STEERING SWITCH CHECK ................. 22 . SPEED ............................................................... 37
.
VEHICLE SPEED SENSOR CHECK ................. 23 . CHECK FOR THE CANCELLATION OF ICC
ASCD PUMP CIRCUIT CHECK ......................... 24 . SYSTEM (NORMAL DRIVING CONDITION) IN
ASCD ACTUATOR/PUMP CHECK .................... 26 . THE FOLLOWING CASES: ............................... 37 .
ECM SIGNAL CHECK ....................................... 27 . CHECK FOR RESTORING THE SPEED THAT
TCS MONITOR CHECK .................................... 28 . IS SET BY ICC SYSTEM BEFORE ICC CAN-
Electrical Component Inspection ........................... 29 .

Revision; 2004 April ACS-1 2003 Q45
CELLATION ........................................................ 37 . DTC 63 RELEASE SW CIRCUIT ...........................77 .
CHECK FOR ON/OFF SWITCH ......................... 37 . DTC 65 PRESSURE CONTROL ...........................78 .
CHECK FOR ACCEL/RES, COAST/SET, CAN- DTC 74 LASER BEAM OFF CNTR .......................79 .
CEL SWITCHES ................................................. 38 . DTC 81 POWER SUPPLY VALVE .........................79 .
CHECK FOR DISTANCE SWITCH .................... 38 . DTC 83 POWER SUPPLY VALVE .........................80 .
LASER BEAM AIMING ADJUSTMENT .................. 39 . DTC 85 AIR VALVE [LOW VOLTAGE] ...................81 .
Outline ................................................................... 39
. DTC 87 RELEASE VALVE [LOW VOLTAGE] ........81 .
Preparation ............................................................ 39
. DTC 90 STOP LAMP RLY FIX ...............................82 .
Outline of Adjustment Procedure ........................... 39 . DTC 92 ECM CIRCUIT ..........................................87 .
Setting the ICC Target Board ................................. 39 . DTC 97 AT CIRCUIT ..............................................87 .
ADJUSTING HEIGHT OF THE TARGET ........... 39 . DTC 98 GEAR POSITION .....................................87 .
ADJUSTING THE RIGHT-LEFT POSITION OF DTC 102 RADAR STAIN ........................................88 .
THE TARGET ..................................................... 40 . DTC 103 LASER SENSOR FAIL ...........................89 .
SETTING THE TARGET .................................... 40 . DTC 104 LASER AIMING INCMP .........................89 .
Aiming Adjustment ................................................. 41 . DTC 107 LASER COMM FAIL ...............................89 .
CHECK AFTER THE ADJUSTMENT ................. 44 . DTC 109 LASER HIGH TEMP ...............................90 .
ELECTRICAL UNITS LOCATION ............................ 45 . TROUBLE DIAGNOSIS FOR SYMPTOMS .............91 .
Component Parts and Harness Connector Location 45 ... Symptom Chart ......................................................91 .
WIRING DIAGRAM .................................................. 46 . Symptom 1: Cruise ON/OFF Does Not Switch ON.
Schematic .............................................................. 46
. (The ICC System Display in the Combination Meter
Wiring Diagram -- ICC -- ..................................... 47 . Does Not Illuminate.) Cruise ON/OFF Does Not
TERMINALS AND REFERENCE VALUE ................ 54 . Switch OFF. (The ICC System Display in the Com-
Terminals and Reference Value for ICC Unit ......... 54 . bination Meter Remains Powered.) ........................92 .
Terminals and Reference Value for ICC Sensor .... 56 . Symptom 2: The ICC System Cannot Be Set (ON/
Terminals and Reference Value for ICC Warning OFF Switch Turns on/Off). .....................................94 .
Chime .................................................................... 56
. Symptom 3: The ICC System Cannot Be Cancelled
TROUBLE DIAGNOSIS -- GENERAL DESCRIP- by the CANCEL Switch, RESUME or Increase the
TION ......................................................................... 57
. Set Vehicle Speed, or Change the Distance Setting. ...95
Work Flow .............................................................. 57
. Symptom 4: The ICC System Is Not Cancelled
CONSULT-II Function ............................................ 58 . When the Gear Is in Other Than `D'. .....................96 .
DESCRIPTION ................................................... 58 . Symptom 5: Chime Does Not Sound. ....................96 .
WORK SUPPORT .............................................. 58 . Symptom 6: Chime Does Not Stop. .......................98 .
SELF-DIAGNOSTIC RESULTS .......................... 59 . Symptom 7: Driving Force Is Hunting. ...................98 .
DATA MONITOR ................................................. 59 . Symptom 8: The ICC System Frequently Cannot
ACTIVE TEST .................................................... 61 . Detect the Vehicle Ahead/The Detection Zone Is
Self-Diagnostic Function ........................................ 62 . Short. .....................................................................98
.
WITH CONSULT-II ............................................. 62 . Symptom 9: The System Does Not Detect the Vehi-
WITHOUT CONSULT-II ...................................... 63 . cle Ahead at All. .....................................................99.
SELF-DIAGNOSIS BY CONSULT-II WILL NOT ELECTRICAL COMPONENT INSPECTION .......... 100 .
RUN .................................................................... 64
. ICC Steering Switch ............................................. 100 .
SELF-DIAGNOSIS BY ICC SYSTEM DISPLAY ICC Brake Switch and Stop Lamp Switch ............ 100 .
WILL NOT RUN. ................................................. 65 . Booster Solenoid .................................................. 100 .
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC Release Switch .................................................... 101 .
ITEMS ....................................................................... 67
. ASCD Actuator ..................................................... 101 .
Diagnostic Trouble Code (DTC) Chart ................... 67 . Vacuum Hose ....................................................... 101 .
DTC 11 CONTROL UNIT ....................................... 69 . ASCD Pump ......................................................... 101 .
DTC 20 CAN COMM CIRCUIT .............................. 69 . REMOVAL AND INSTALLATION ........................... 103 .
DTC 31 POWER SUPPLY CIR 1, DTC 34 POWER ICC Unit ............................................................... 103
.
SUPPLY CIR 2 ....................................................... 69 . ICC Sensor .......................................................... 103.
DTC 41 VHCL SPEED SE CIRC ........................... 70 . ICC Warning Chime ............................................. 104 .
DTC 42 THRTL POS SEN CIRC ........................... 70 . ICC Steering Switch ............................................. 104 .
DTC 43 ABS/TCS/VDC CIRC ............................... 72 . ASCD Wire Adjustment ........................................ 105 .
DTC 45 BRAKE SW/STOP L SW .......................... 72 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 106 .
DTC 46 OPERATION SW CIRC ............................ 74 . Standard and Limit ............................................... 106 .
DTC 61 PRESS SEN CIRCUIT ............................. 76 . Tightening torque ................................................. 106 .
DTC 62 BOOSTER SOL/V CIRCUIT ..................... 76 .

Revision; 2004 April ACS-2 2003 Q45
PRECAUTIONS
[ASCD]
PRECAUTIONS
[ASCD] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS006S7

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 C
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: D
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. E
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. F
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 harnesses or
harness connectors.
G
Wiring Diagrams and Trouble Diagnosis EKS005Q9

When you read wiring diagrams, refer to the followings:
H
q Refer to GI-14, "How to Read Wiring Diagrams" in GI section
q Refer to PG-2, "POWER SUPPLY ROUTING" for power distribution circuit in PG section
When you perform trouble diagnosis, refer to the followings: I
q Refer to GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES" in GI section
q Refer to GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident" in GI section
J

ACS

Revision; 2004 April ACS-3 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
AUTOMATIC SPEED CONTROL DEVICE (ASCD) PFP:18930

Component Parts and Harness Connector Location EKS003O7

PKIA2625E

System Description EKS003O8

Refer to Owner's Manual for ASCD operating instructions.
POWER SUPPLY AND GROUND
When ignition switch is in the ON or START position power is supplied:
q through 10A fuse [No. 12, located in the fuse block (J/B) NO.1]
q to ASCD control unit terminal 5 and
q through ASCD brake switch terminal 1and 2
q to park/neutral position relay terminal 3.
q through 10A fuse [No. 9, located in the fuse block (J/B) NO.1]

Revision; 2004 April ACS-4 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
q to combination meter terminal 59
Power is supplied at all times: A
q through 15A fuse [No. 17, located in the fuse block (J/B) NO.1]
q to the stop lamp switch terminal 1.
B
When park/neutral position is in the P or N position, ground is supplied:
q to park/neutral position relay terminal 2
q through body grounds E24 and E44. C
When MAIN (CRUISE) switch is depressed (ON), ground is supplied:
q to ASCD steering switch terminal 1
q from ASCD control unit terminal 11. D
q to ASCD control unit terminal 24
q from ASCD steering switch terminal 2.
then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator. E
Ground is supplied:
q to combination meter terminal 63
q from ASCD control unit terminal 15. F

OPERATION
Set Operation G
To activate the ASCD, all of following conditions must exist.
q Power supply to ASCD control unit terminal 8. [Brake pedal is released and A/T selector lever is in a posi-
tion other than P or N.] H
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, power is supplied:
q from ASCD control unit terminal 11. I
q to ASCD steering switch terminal 1.
And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground
J
q to combination meter terminals 64 to illuminate SET indicator.
A/T Overdrive Control during Cruise Control Driving
When the vehicle speed is approximately 3 km/h (2 MPH) below set speed, a signal is sent ACS
q from ASCD control unit terminal 10
q to TCM (transmission control module) through combination meter.
When this occurs, the TCM (transmission control module) cancels overdrive. L
After vehicle speed is approximately 1 km/h (0.6 MPH) above set speed, overdrive is reactivated.
ASCD Shifting Control
M
During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting.
This is used to control the signals below.
q Throttle position sensor from ECM
q A/T shift solenoid valve A
Coast Operation
When the SET/COAST switch is depressed during cruise control driving, ASCD actuator returns the throttle
cable to decrease vehicle set speed until the switch is released. And then ASCD will keep the new set speed.
Accel Operation
When the RESUME/ACCEL switch is depressed, power is supplied
q from ASCD control unit terminal 11
q to ASCD steering switch terminal 1.
If the RESUME/ACCEL switch is depressed during cruise control driving, ASCD actuator pulls the throttle
cable to increase the vehicle speed until the switch is released or vehicle speed reaches the maximum speed
controlled by the system. ASCD will then keep the new set speed.

Revision; 2004 April ACS-5 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
Cancel Operation
When any of following conditions exist, cruise operation will be canceled.
q CANCEL switch is depressed. (Power supply to ASCD control unit terminal 11)
q Brake pedal is depressed. (Power supply to ASCD control unit terminal 23 from stop lamp switch)
q Brake pedal is depressed or A/T selector lever is shifted to P or N position. (Power supply to ASCD con-
trol unit terminal 8 is interrupted.)
If MAIN (CRUISE) switch is turned to OFF during ASCD activation, all ASCD operations will be canceled and
vehicle speed memory will be erased.
Resume Operation
When the RESUME/ACCEL switch is depressed after cancel operation other than when depressing MAIN
(CRUISE) switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehi-
cle condition must meet following conditions.
q Brake pedal is released.
q A/T selector lever is in other than P and N position.
q Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH).
ASCD PUMP OPERATION
The ASCD pump consists of a vacuum motor, an air valve and a release valve. When the ASCD activates,
power is supplied
q from ASCD control unit terminal 12
q to ASCD pump terminal 1.
Ground is supplied to vacuum motor, air valve and release valve from ASCD control unit depending on the
operated condition as shown in the below table.
The pump is connected to ASCD actuator by vacuum hose. When the ASCD pump is activated, the ASCD
pump vacuum affects the diaphragm of ASCD actuator to control throttle cable.
Actuator inner pres-
Air valve (*1) Release valve (*1) Vacuum motor
sure
ASCD not operating Open Open Stopped Atmosphere
Releasing throttle
Open Closed Stopped Vacuum
cable
ASCD operating Holding throttle
Closed Closed Stopped Vacuum (*2)
position
Pulling throttle cable Closed Closed Operated Vacuum
*1: When power and ground is supplied, valve is closed.
*2: Set position held.

Revision; 2004 April ACS-6 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
Schematic EKS003O9

ACS

TBWM0059E

Revision; 2004 April ACS-7 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
Wiring Diagram -- ASCD -- EKS003OA

FIG. 1

TKWM0441E

Revision; 2004 April ACS-8 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
FIG. 2
A

ACS

TKWM0442E

Revision; 2004 April ACS-9 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
FIG. 3

TBWM0062E

Revision; 2004 April ACS-10 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
FIG. 4
A

ACS

TBWM0063E

Revision; 2004 April ACS-11 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
FIG. 5

TKWM0443E

Revision; 2004 April ACS-12 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
FIG. 6
A

ACS

TKWM0444E

Fail-Safe System EKS003OB

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

PBIC0201E

Revision; 2004 April ACS-13 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
MALFUNCTION DETECTION CONDITIONS
ASCD operation during malfunc-
Detection conditions
tion detection
q ASCD steering (RESUME/ACCEL, CANCEL, SET/COAST) switch is stuck. q ASCD is deactivated.
q Vacuum motor ground circuit or power circuit is open or shorted. q Vehicle speed memory is can-
q Air valve ground circuit or power circuit is open or shorted. celed.

q Release valve ground circuit or power circuit is open or shorted.
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.

CONSULT-II Inspection Procedure EKS003OC

1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-ll CONVERTER to data
link connector.

PBIC0202E

3. Turn ignition switch ON.
4. Turn MAIN (CRUISE) switch ON.
5. Touch START(NISSAN BASED VHCL) (on CONSULT-II dis-
play).
6. Touch ASCD.
If "ASCD" is not indicated, go to GI-38, "CONSULT-II Data Link
Connector (DLC) Circuit" .

SKIA3098E

7. Touch SELF-DIAG RESULTS.

PEL041P

Revision; 2004 April ACS-14 2003 Q45
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
q Self-diagnostic results are shown on display.
Refer to ACS-15, "CONSULT-II Self-diagnostic Results" table. A

PFA021B

D
8. Touch DATA MONITOR.

G
PEL043P

q Touch START. H
q Data monitor results are shown on display.
Refer to ACS-16, "CONSULT-II Data Monitor" table.
I
For further information, read the CONSULT-II Operation Manual.

ACS
PEL811S

CONSULT-II Self-diagnostic Results EKS003OD

Diagnostic item Description Repair/Check order
L

NO DTC IS DETECTED.
q Even if no malfunction is indicated, further testing may be
FURTHER TESTING --
required as far as the customer complains. M
MAY BE REQUIRED.
q The power supply circuit for the ASCD pump is open. (An ASCD PUMP CIRCUIT CHECK
POWER SUPPLY-VALVE
abnormally high voltage is entered.) ACS-24
q The vacuum motor circuit is open or shorted. (An abnor- ASCD PUMP CIRCUIT CHECK
VACUUM PUMP
mally high or low voltage is entered.) ACS-24
q The air valve circuit is open or shorted. (An abnormally ASCD PUMP CIRCUIT CHECK
AIR VALVE
high or low voltage is entered.) ACS-24
q The release valve circuit is open or shorted. (An abnor- ASCD PUMP CIRCUIT CHECK
RELEASE VALVE
mally high or low voltage is entered.) ACS-24
VEHICLE SPEED SENSOR
VHCL SP

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