Nissan Frontier D40. Manual - part 420

ASCD BRAKE SWITCH

EC-371

< COMPONENT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

Disconnect ASCD brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E160
• 10A fuse (No.12)
• Harness for open or short between ASCD brake switch and fuse

>> Repair open circuit, short to ground or short to power in harness or connectors.

5.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1. 
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit, short to ground or short to power in harness or connectors.

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-329, "Component Inspection"

.

OK or NG

OK 

>> GO TO 9.

NG

>> Replace ASCD brake switch.

7.

CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 108 and ASCD clutch switch terminal 2.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

BBIA0560E

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

Continuity should exist.

EC-372

< COMPONENT DIAGNOSIS >

[QR25DE]

ASCD BRAKE SWITCH

OK or NG

OK

>> GO TO 8.

NG

>> Repair open circuit, short to ground or short to power in harness or connectors.

8.

CHECK ASCD CLUTCH SWITCH

Refer to 

EC-329, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace ASCD clutch switch

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273410

ASCD BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

3.

Check continuity between ASCD brake switch terminals 1 and 2
under the following conditions.

If NG, adjust ASCD brake switch installation, refer to 

BR-19

, and

perform step 3 again.

ASCD CLUTCH SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD clutch switch harness connector.

3.

Check continuity between ASCD clutch switch terminals 1 and 2
under the following conditions.

If NG, adjust ASCD clutch switch installation, refer to 

CL-8, "On-

Vehicle Inspection and Adjustment"

, and perform step 3 again.

Condition

Continuity

Brake pedal: Fully released

Should exist

Brake pedal: Slightly depressed

Should not exist

SEC023D

Condition

Continuity

Clutch pedal: Fully released

Should exist

Clutch pedal: Slightly depressed

Should not exist

SEC024D

ASCD INDICATOR

EC-373

< COMPONENT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

ASCD INDICATOR

Component Description

INFOID:0000000005273411

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD
system is ready for operation.
SET indicator illuminates when the following conditions are met. 
• CRUISE indicator is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD

setting.

SET indicator remains lit during ASCD control.
Refer to

CCS-2

  for the ASCD function.

Diagnosis Procedure

INFOID:0000000005273412

1.

CHECK OVERALL FUNCTION

Check ASCD indicator under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK DTC

Check that DTC UXXXX is not displayed.

Yes or No

Yes

>> Perform trouble diagnoses for DTC UXXXX, refer to 

EC-93

.

No

>> GO TO 3.

3.

CHECK COMBINATION METER OPERATION

Refer to 

MWI-3

.

OK or NG

OK

>> GO TO 4.

NG

>> Go to 

MWI-5, "METER SYSTEM : Arrangement of Combination Meter"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46

.

>> INSPECTION END

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE LAMP

• Ignition switch: ON

MAIN switch: Pressed at the 1st 
time 

→

 at the 2nd time

ON 

→

 OFF

SET LAMP

• MAIN switch: ON 
• When vehicle speed is between 

40 km/h (25 MPH) and 144 km/h (89 MPH)

ASCD: Operating

ON

ASCD: Not operating

OFF

EC-374

< COMPONENT DIAGNOSIS >

[QR25DE]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000005273413

The electrical load signal (Headlamp switch signal, etc.) is transferred through the CAN communication line
from BCM to ECM via IPDM E/R.

Diagnosis Procedure

INFOID:0000000005273414

1.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

1.

Turn ignition switch ON.

2.

Connect CONSULT-III and select “DATA MONITOR” mode.

3.

Select “LOAD SIGNAL” and check indication under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK HEADLAMP SYSTEM

Refer to

EXL-138

  or 

EXL-142

.

>> INSPECTION END

Condition

Indication

Lighting switch: ON at 2nd position

ON

Lighting switch: OFF

OFF