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Home >> Suzuki >> 2009 >> Equator Base, 4D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ40DE) - (5 Of 5) >> ASCD Brake Switch Circuit Check >> Diagnosis Procedure >> M/T Models
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M/T Models

DIAGNOSIS PROCEDURE

Step Action YES NO
1  CHECK OVERALL FUNCTION-I 
  1. With SDT 
    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "Data list" mode with SDT.
    3. Check "BRAKE SW1" indication under the following conditions.
G06441654G06441655G06441656Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 2) Without SDT 
    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
G06441654G06441655G06441656Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
G06441654G06441655G06441656Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

OK or NG 		 GO TO 2. GO TO 3.
2  CHECK OVERALL FUNCTION-II 
  1. With SDT 

    Check "BRAKE SW2" indication in "Data list" mode.

  2. Without SDT 

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


OK or NG 		 INSPECTION END  GO TO 10.
3  CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT 
  1. Turn ignition switch OFF.
  2. Disconnect ASCD clutch switch harness connector.
G06441657G06441658G06441659Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 3. Turn ignition switch ON.
  2. 4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with SDT or tester.
G06441657G06441658G06441659Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
G06441657G06441658G06441659Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

OK or NG 		 GO TO 8. GO TO 4.
4  CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT 
  1. Turn ignition switch OFF.
  2. Disconnect ASCD brake switch harness connector.
G06441660G06441661Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 3. Turn ignition switch ON.
  2. 4. Check voltage between ASCD brake switch terminal 1 and ground with SDT or tester.
G06441660G06441661Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Voltage: Battery voltage 


OK or NG 		 GO TO 6. GO TO 5.
5  DETECT MALFUNCTIONING PART 
Check the following.
  • Fuse block (J/B) connector E160
  • 10 A fuse (No. 12)
  • Harness for open or short between ASCD brake switch and fuse
 Repair open circuit or short to ground 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 .

    Continuity should exist. 

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

OK or NG 		 GO TO 7. Repair open circuit or short to ground or short to power in harness or connectors.
7  CHECK ASCD BRAKE SWITCH 
Refer to [ASCD BRAKE SWITCH CIRCUIT CHECK ].
OK or NG 		 GO TO 14. Replace ASCD brake switch.
8  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 clutch 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 		 GO TO 9. Repair open circuit or short to ground or short to power in harness or connectors.
9  CHECK ASCD CLUTCH SWITCH 
Refer to [ASCD BRAKE SWITCH CIRCUIT CHECK ].
OK or NG 		 GO TO 14. Replace ASCD clutch switch.
10  CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
  1. Turn ignition switch OFF.
  2. Disconnect stop lamp switch harness connector.
G06441662G06441663Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 3. Check voltage between stop lamp switch terminal 2 and ground with SDT or tester.
G06441662G06441663Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Voltage: Battery voltage 


OK or NG 		 GO TO 12. GO TO 11.
11  DETECT MALFUNCTIONING PART 
Check the following.
  • Fuse block (J/B) connector E160
  • 10 A fuse (No. 20)
  • 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.  
12  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 		 GO TO 13. Repair open circuit or short to ground or short to power in harness or connectors.
13  CHECK STOP LAMP SWITCH 
Refer to [ASCD BRAKE SWITCH CIRCUIT CHECK ].
OK or NG 		 GO TO 14. Replace stop lamp switch.
14  CHECK INTERMITTENT INCIDENT 
Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ]		 INSPECTION END   
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