Infiniti G35 (V35). Manual - part 420

DTC P1572 ASCD BRAKE SWITCH

EC-561

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EC

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-II or tester.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E101

●

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.

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 or short to ground or short to power in harness or connectors.

7. 

CHECK ASCD BRAKE SWITCH

Refer to 

EC-564, "Component Inspection"

  

OK or NG

OK

>> GO TO 16.

NG

>> Replace ASCD brake switch.

PBIB1282E

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

EC-562

DTC P1572 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 ASCD clutch switch terminal 2 and ECM terminal 108.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 9.

9. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E10, F1

●

Harness for open or short between ECM and ASCD clutch switch

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

10. 

CHECK ASCD CLUTCH SWITCH

Refer to 

EC-564, "Component Inspection"

 .

OK or NG

OK

>> GO TO 16.

NG

>> Replace ASCD clutch switch.

11. 

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 3 and ground
with CONSULT -II or tester.

OK or NG

OK

>> GO TO 13.

NG

>> GO TO 12.

Continuity should exist.

PBIB1282E

Voltage: Battery voltage

PBIB2102E

DTC P1572 ASCD BRAKE SWITCH

EC-563

C

D

E

F

G

H

I

J

K

L

M

A

EC

12. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector E101

●

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.

13. 

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 4.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 14.

14. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness connectors M72, F102

●

Harness for open or short between ECM and stop lamp switch

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

15. 

CHECK STOP LAMP SWITCH

Refer to 

EC-564, "Component Inspection"

  

OK or NG

OK

>> GO TO 16.

NG

>> Replace stop lamp switch.

16. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

EC-564

DTC P1572 ASCD BRAKE SWITCH

Component Inspection

NBS00103

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-6,

"BRAKE PEDAL"

 , 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-5,

"CLUTCH PEDAL"

  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 3 and 4
under the following conditions.

If NG, adjust stop lamp switch installation, refer to 

BR-6,

"BRAKE PEDAL"

 , 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

PBIB2103E