Nissan Frontier D40. Manual - part 409

P1572 ASCD BRAKE SWITCH

EC-327

< COMPONENT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 10.

3.

CHECK ASCD BRAKE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD clutch switch harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between ASCD clutch switch terminal 1 and
ground under the following conditions with CONSULT-III or
tester.

OK or NG

OK 

>> GO TO 8.

NG

>> GO TO 4.

4.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

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 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

BBIA0624E

CONDITION

VOLTAGE

Brake pedal: Fully released

Battery voltage

Brake pedal: Slightly depressed

Approx. 0V

PBIB0799E

BBIA0560E

Voltage: Battery voltage

PBIB0857E

EC-328

< COMPONENT DIAGNOSIS >

[QR25DE]

P1572 ASCD BRAKE SWITCH

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.

6.

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 7.

NG

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

7.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-329, "Component Inspection"

.

OK or NG

OK

>> GO TO 14.

NG

>> Replace ASCD brake switch.

8.

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.

OK or NG

OK

>> GO TO 9.

NG

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

9.

CHECK ASCD CLUTCH SWITCH

Refer to 

EC-329, "Component Inspection"

.

OK or NG

OK

>> GO TO 14.

NG

>> Replace ASCD clutch switch.

10.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

Continuity should exist.

Continuity should exist.

BBIA0560E

P1572 ASCD BRAKE SWITCH

EC-329

< COMPONENT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3.

Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E160
• 10A fuse(No.20)
• Harness for open or short between stop lamp switch and fuse

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

12.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 13.

NG

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

13.

CHECK STOP LAMP SWITCH

Refer to 

EC-329, "Component Inspection"

.

OK or NG

OK

>> GO TO 14.

NG

>> Replace stop lamp switch.

14.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273353

ASCD BRAKE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

Voltage: Battery voltage

PBIB0117E

Continuity should exist.

EC-330

< COMPONENT DIAGNOSIS >

[QR25DE]

P1572 ASCD BRAKE SWITCH

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.

STOP LAMP SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect stop lamp switch harness connector.

3.

Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.

If NG, adjust stop lamp switch installation, refer to 

BR-19

, 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

Condition

Continuity

Brake pedal: Fully released

Should not exist

Brake pedal: Slightly depressed

Should exist

PBIB2285E