Nissan Frontier D22. Manual - part 5

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ACS-13

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ACS

FAIL-SAFE SYSTEM CHECK

1.

Turn ignition switch to ON position.

2.

Turn CRUISE ON·OFF switch to ON and check if the “SET” indi-
cator blinks.
If the indicator lamp blinks, check the following.

●

ASCD steering switch. Refer to 

ACS-17, "ASCD STEERING

SWITCH CHECK"

 .

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.

●

Vehicle speed sensor. Refer to 

ACS-18, "VEHICLE SPEED

SENSOR CHECK"

 .

●

ASCD motor actuator circuit. Refer to 

ACS-18, "ASCD

MOTOR ACTUATOR CIRCUIT CHECK"

 .

●

Replace control unit.

4.

Drive the vehicle at more than 20 km/h (12 MPH).
If the indicator lamp blinks, check the following.

●

Replace 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.

●

ASCD brake/stop lamp switch. Refer to 

ACS-15, "ASCD

BRAKE/STOP LAMP SWITCH CHECK"

 .

6.

END. (System is OK.)

SEL417V

SEL767P

SAT797A

ACS-14

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

POWER SUPPLY AND GROUND CIRCUIT CHECK

1. 

CHECK POWER SUPPLY CIRCUIT FOR ASCD CONTROL UNIT

1.

Disconnect ASCD control unit harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between ASCD control unit harness connector M119 terminal 5 (G/W) and ground.

Refer to 

ACS-8, "Wiring Diagram — ASCD —"

 .

Yes

>> GO TO 2.

No

>> Check the following.

●

10A fuse (No. 5 located in the fuse block)

●

Harness for open or short

2. 

CHECK GROUND CIRCUIT FOR ASCD CONTROL UNIT

Check continuity between ASCD control unit harness connector M119 terminal 17 (B) and ground.

Refer to 

ACS-8, "Wiring Diagram — ASCD —"

 .

Yes

>> Power supply and ground circuit are OK.

No

>> Repair harness.

WEL018A

WEL019A

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

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ACS

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 M119 terminal 8 (L/Y) and terminal 5 (G/
W).

OK or NG

OK

>> GO TO 2.

NG

>> Check the following.

●

ASCD brake switch
Refer to 

ACS-15, "ASCD BRAKE/STOP LAMP SWITCH CHECK"

 .

●

Park/neutral position switch (A/T)
Refer to 

ACS-21, "PARK/NEUTRAL POSITION SWITCH (A/T)"

 .

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Park/neutral position relay (A/T)
Refer to 

ACS-22, "ASCD RELAY (A/T)"

 .

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ASCD clutch switch (M/T)
Refer to 

ACS-21, "ASCD CLUTCH SWITCH (M/T)"

 .

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Harness for open or short

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ASCD control unit

WEL020A

ACS-16

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

2. 

CHECK STOP LAMP SWITCH CIRCUIT

1.

Disconnect ASCD control unit harness connector.

2.

Check voltage between ASCD control unit harness connector M119 terminal 23 (BR/R) and ground.

Refer to 

ACS-8, "Wiring Diagram — ASCD —"

 .

OK or NG

OK

>> ASCD brake/stop lamp switch is OK.

NG

>> Check the following.

●

15A fuse (2-door models) or 20A fuse (4-door models) [No. 22, located in the fuse block (J/B)]

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

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Harness for open or short between fuse and stop lamp switch

●

Stop lamp switch
Refer to 

ACS-15, "ASCD BRAKE/STOP LAMP SWITCH CHECK"

 .

WEL035A