Diagnosis Procedure

CHECK OVERALL FUNCTION-I

With CONSULT-III

Turn ignition switch ON.
Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
Check "BRAKE SW1" indication under the following conditions.

BRAKE SW1 REFERENCE

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

Without CONSULT-III

Turn ignition switch ON.
Check voltage between ECM terminal 108 and ground under the following conditions.

TERMINALS VOLTAGE REFERENCE

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

Fig 1: Checking Voltage Between ECM Terminal 108 (ASCD Brake Switch Signal) And Ground

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

OK or NG

OK: GO TO 2.

NG: GO TO 3.

CHECK OVERALL FUNCTION-II

With CONSULT-III

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

BRAKE SW2 REFERENCE

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

Without CONSULT-III

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

TERMINALS VOLTAGE REFERENCE

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

Fig 2: Checking Voltage Between ECM Terminal 101 And Ground

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

OK or NG

OK: INSPECTION END

NG: GO TO 7.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
  
  Fig 3: 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-III or tester.
Voltage: Battery voltage

Fig 4: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E30
- 10 A 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.
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 .
  
  Continuity should exist.
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.
CHECK ASCD BRAKE SWITCH
Refer to , "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 11.

NG: Replace ASCD brake switch.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
  
  Fig 5: Identifying ASCD Brake Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -II or tester.
Voltage: Battery voltage

Fig 6: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 9.

NG: GO TO 8.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E30
- 10 A 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.
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 .
  
  Continuity should exist.
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.
CHECK STOP LAMP SWITCH
Refer to , "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 11.

NG: Replace stop lamp switch.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END