Diagnostic Procedure

With CONSULT-II 

1. Turn ignition switch ON.
2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
3. Check "BRAKE SW1" indication under the following conditions.
   BRAKE PEDAL CONDITION - INDICATION
   
   

   CONDITION	INDICATION
   Brake pedal: Slightly depressed	OFF
   Brake pedal: Fully released	ON

   Fig 1: CONSULT-II Display - BRAKE SW1

   Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the following conditions.
   BRAKE PEDAL CONDITION - VOLTAGE
   
   

   CONDITION	VOLTAGE
   Brake pedal: Slightly depressed	Approximately 0V
   Brake pedal: Fully released	Battery voltage

   Fig 2: Checking Voltage Between ECM Terminal 108 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 2.
2. NG: GO TO  3.

With CONSULT-II 

Check "BRAKE SW2" indication in "DATA MONITOR" mode.

Fig 3: CONSULT-II Display - "BRAKE SW2" In "DATA MONITOR" Modes

Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

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

Fig 4: Checking Voltage Between ECM Terminal 101 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: INSPECTION END 
2. NG: GO TO  7.

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
   Fig 5: Identifying ASCD Brake Switch

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
   1. Voltage: Battery voltage 
   Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 4.

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

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 .
   1. Continuity should exist. 
4. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO 6.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to "COMPONENT INSPECTION ".

1. OK: GO TO  7.
2. NG: Replace ASCD brake switch.

1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
   Fig 7: Identifying Stop Lamp Switch

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between stop lamp switch terminal 3 and ground with CONSULT-II or tester.
   1. Voltage: Battery voltage 

OK or NG 

1. OK: GO TO  5.
2. NG: GO TO 8.

Fig 8: Check Voltage Between Stop Lamp Switch Terminal 3 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

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
  1. Repair open circuit or short to ground or short to power in harness or connectors.
• 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 .
     1. Continuity should exist. 
  3. Also check harness for short to ground and short to power.

  OK or NG 

  1. OK: GO TO 10.
  2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
• CHECK STOP LAMP SWITCH 

  Refer to "COMPONENT INSPECTION ".

  OK or NG 

  1. OK: GO TO 11.
  2. NG: Replace stop lamp switch.
• CHECK INTERMITTENT INCIDENT 

  Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

  1. : INSPECTION END