Nissan Titan A60. Manual - part 442

EC-434

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ASCD BRAKE SWITCH

ASCD BRAKE SWITCH

Component Description

INFOID:0000000006158917

When the brake pedal is depressed, ASCD brake switch is turned

OFF and stop lamp switch is turned ON. ECM detects the state of

the brake pedal by this input of two kinds (ON/OFF signal).

Refer to 

EC-28

 for the ASCD function.

Diagnosis Procedure

INFOID:0000000006158918

1.

CHECK OVERALL FUNCTION-I

 With CONSULT-III

1. Turn ignition switch ON.

2. Select “BRAKE SW 1” in “DATA MONITOR” mode with CONSULT-III.

3. Check “BRAKE SW 1” indication under the following conditions.

 Without CONSULT-III

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 108 and ground under the

following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT-III

Check “BRAKE SW 2” indication in “DATA MONITOR” mode. 

 Without CONSULT-III

Check voltage between ECM terminal 101 and ground under the following conditions.

BBIA0087E

CONDITION

INDICATION

Brake pedal: Slightly depressed

OFF

Brake pedal: Fully released

ON

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

MBIB0061E

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

ASCD BRAKE SWITCH

EC-435

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

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M

A

EC

N

P

O

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

3.

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 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors M31, E152

• Fuse block (J/B) connector M4

• 10A fuse

• Harness for open or short between ASCD brake switch and fuse

>> Repair open circuit or 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. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 108 and ASCD brake 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 6.

NG

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

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

PBIB1537E

BBIA0373E

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

EC-436

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ASCD BRAKE SWITCH

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-437, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace ASCD brake switch.

7.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check voltage between stop lamp switch terminal 1 and ground

with CONSULT -III or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors M31, E152

• Fuse block (J/B) connector M60

• 10A fuse

• Harness for open or short between stop lamp switch and battery

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

9.

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 10.

NG

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

10.

CHECK STOP LAMP SWITCH

Refer to 

EC-437, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

BBIA0373E

Voltage: Battery voltage

WBIA0545E

Continuity should exist.

ASCD BRAKE SWITCH

EC-437

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NG

>> Replace stop lamp switch.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

 and 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006158919

ASCD BRAKE SWITCH

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check harness continuity between ASCD brake switch terminals

1 and 2 under the following conditions.

If NG, adjust ASCD brake switch installation, refer to 

BR-13,

"Inspection and Adjustment - Standard Pedal"

, and perform step

3 again.

STOP LAMP SWITCH

1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1

and 2 under the following conditions.

If NG, adjust stop lamp switch installation, refer to 

BR-13,

"Inspection and Adjustment - Standard Pedal"

, and perform step

3 again.

Condition

Continuity

Brake pedal: Fully released.

Should exist.

Brake pedal: Slightly depressed.

Should not exist.

SEC023D

Condition

Continuity

Brake pedal: Fully released.

Should not exist.

Brake pedal: Slightly depressed.

Should exist.

WBIA0546E