Nissan Frontier D22. Manual - part 4

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-9

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ACS

FIG. 2

WKWA0291E

ACS-10

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

FIG. 3

WKWA0629E

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-11

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ACS

Fail-safe System

EKS006XJ

DESCRIPTION

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

MALFUNCTION DETECTION CONDITIONS

SEL255W

Detection conditions

ASCD operation during malfunc-

tion detection

●

ASCD steering (RES/ACCEL, CANCEL, COAST/SET) switch is stuck.

●

ASCD motor actuator ground circuit or power circuit is open or shorted.

●

ASCD motor actuator has internal malfunction.

●

Vehicle speed sensor is faulty.

●

ASCD control unit internal circuit is malfunctioning.

●

ASCD is deactivated.

●

Vehicle speed memory is can-
celed.

●

ASCD brake switch or stop lamp switch is faulty.

●

ASCD is deactivated.

●

Vehicle speed memory is not 
canceled.

ACS-12

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Trouble Diagnoses

EKS006XK

SYMPTOM CHART

X: Applicable
*1: It indicates that system is in fail-safe. After completing diagnostic procedures, perform “FAIL-SAFE SYSTEM CHECK”, (

ACS-13

 ) to

verify repairs.
*2: If vehicle speed is greater than 40 km/h (25 MPH) after system has been released, pressing RES/ACCEL switch returns vehicle
speed to the set speed previously achieved. However, doing so when the ON·OFF main switch is turned to “OFF”, vehicle speed will not
return to the set speed since the memory is canceled.
*3: Check only ON·OFF switch built-in steering switch.

PROCEDURE

Diagnostic procedure

REFERENCE PAGE

ACS-11

ACS-14

ACS-15

ACS-17

ACS-18

ACS-18

ACS-20

SYMPTOM

F

A

IL-

SAFE SYSTEM

 CHECK

POW

E

R 

SUPPL

Y AND GRO

UND CIR

CUIT CHECK

ASCD BRAKE/

S

T

OP LAM

P

 SW

IT

CH CHECK

ASCD STEERIN

G SW

IT

CH CHECK

VEHICLE SPEED 

SE

NSOR

 CHECK

ASCD M

O

T

O

R ACTUA

T

OR CIR

CUIT CHECK

ASCD M

O

T

O

R ACTUA

T

OR CHECK

ASCD cannot be set. (“CRUISE” indicator 
lamp does not turn ON.)

X

X*3

ASCD cannot be set. (“SET” indicator lamp 
does not turn ON.)

X

X

X

ASCD cannot be set. (“SET” indicator lamp 
blinks. *1)

X

X

X

X

X

Vehicle speed does not decrease after 
COAST/SET switch has been pressed.

X

X

Vehicle speed does not return to the set 
speed after RES/ACCEL switch has been 
pressed. *2

X

X

Vehicle speed does not increase after RES/
ACCEL switch has been pressed.

X

X

System is not released after CANCEL switch 
(steering) has been pressed.

X

X

Large difference between set speed and 
actual vehicle speed.

X

X

X

Deceleration is greatest immediately after 
ASCD has been set.

X

X

X