Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

1. CHECK OVERALL FUNCTION-I

   With CONSULT 

   1. Turn ignition switch ON.
   2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
   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 

   1. Turn ignition switch ON.
   2. Check the voltage between ECM harness connectors.

      ECM			Condition		Voltage
      Connector	+	-
      	Terminal	Terminal
      E10	110 (ASCD brake switch signal)	112	Brake pedal	Slightly depressed	Approx. 0 V
      				Fully released	Battery voltage

      Fig 1: Checking Voltage Between ECM Harness Connector E10 Terminals

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: GO TO  3.

2. CHECK OVERALL FUNCTION-II

   With CONSULT 

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

   Monitor item	Condition		Indication
   BRAKE SW2	Brake pedal	Slightly depressed	ON
   		Fully released	OFF

   Without CONSULT 

   Check the voltage between ECM harness connectors.

   ECM			Condition		Voltage
   Connector	+	-
   	Terminal	Terminal
   E10	106 (Stop lamp switch signal)	112	Brake pedal	Slightly depressed	Battery voltage
   				Fully released	Approx. 0 V

   Fig 2: Checking Voltage Between ECM Harness Connector E10 Terminals

   Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal? 

   YES: GO TO  13.

   NO: GO TO  8.

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 the voltage between ASCD brake switch harness connector and ground.

      ASCD brake switch		Ground	Voltage
      Connector	Terminal
      E37	1	Ground	Battery voltage

      Fig 3: Checking Voltage Between ASCD Brake Switch Harness Connector Terminal 1 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

4. DETECT MALFUNCTIONING PART

   Check the following.

   • Fuse block (J/B) connector E6
   • Junction block harness connectors E44, E46
   • 10 A fuse (No. 3)
   • Harness for open or short between ASCD brake switch and fuse

     : Repair open circuit, 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 the continuity between ASCD brake switch harness connector and ECM harness connector.

      ASCD brake switch		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E37	2	E10	110	Existed

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

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

6. DETECT MALFUNCTIONING PART

   Check the following.

   • Junction block connectors E45, E46
   • Harness for open or short between ASCD brake switch and ECM

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

7. CHECK ASCD BRAKE SWITCH

   Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) "

   Is the inspection result normal? 

   YES: GO TO  13.

   NO: Replace ASCD brake switch. Refer to REMOVAL AND INSTALLATION .

8. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect stop lamp switch harness connector.
   3. Check the voltage between stop lamp switch harness connector and ground.

      Stop lamp switch		Ground	Voltage
      Connector	Terminal
      E38	3	Ground	Battery voltage

      Fig 4: Checking Voltage Between Stop Lamp Switch Terminal 3 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 9.

9. DETECT MALFUNCTIONING PART

   Check the following.

   • Fuse block (J/B) connector E6
   • 10 A fuse (No. 7)
   • Harness for open or short between stop lamp switch and battery

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

10. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between stop lamp switch harness connector and ECM harness connector.

       Stop lamp switch		ECM		Continuity
       Connector	Terminal	Connector	Terminal
       E38	4	E10	106	Existed

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

       Is the inspection result normal? 

       YES: GO TO  12.

       NO: GO TO 11.

11. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • Junction block connectors E44, E45
    • Harness for open or short between stop lamp switch and ECM

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

12. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) "

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace stop lamp switch. Refer to "EXPLODED VIEW ".

13. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END