ASCD BRAKE SWITCH

With CONSULT-III

1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
   

   Monitor item	Condition		Indication
   BRAKE SW1	Brake pedal	Slightly depressed	OFF
   		Fully released	ON

   
   

Without CONSULT-III

1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals as follows.
   

   ECM			Condition		Voltage (V)
   Connector	+	–
   	Terminal	Terminal
   M107	117 (ASCD brake switch signal)	128	Brake pedal	Slightly depressed	Approx. 0
   				Fully released	Battery voltage

   
   

YES>>INSPECTION END

NO>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD brake switch harness connector and ground.
   

   ASCD brake switch		Ground	Voltage
   Connector	Terminal
   E109	1	Ground	Battery voltage

   
   

YES>>GO TO 3.

NO>>GO TO 2.

Check the following.

• Fuse block (J/B) connector E103
• 10A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse

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

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

   ASCD brake switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E109	2	M107	117	Existed

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

YES>>GO TO 5.

NO>>GO TO 4.

Check the following.

• Harness connectors E106, M6
• Harness for open or short between ECM and ASCD brake switch

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

Refer to Component Inspection (ASCD Brake Switch) (GT-R certified NISSAN dealer)

YES>>GO TO 6.

NO>>Replace ASCD brake switch.

Refer to Intermittent Incident.

>>INSPECTION END

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

   Terminals	Condition		Continuity
   1 and 2	Brake pedal	Fully released	Existed
   		Slightly depressed	Not existed

   
   

YES>>INSPECTION END

NO>>GO TO 2.

1. Adjust ASCD brake switch installation. Refer to Inspection and Adjustment (GT-R certified NISSAN dealer).
2. Check the continuity between ASCD brake switch terminals under the following conditions.
   

   Terminals	Condition		Continuity
   1 and 2	Brake pedal	Fully released	Existed
   		Slightly depressed	Not existed

   
   

YES>>INSPECTION END

NO>>Replace ASCD brake switch.