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Home >> Lexus >> 2006 >> GX 470 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System >> Check Can Bus Line For Short To GND >> Inspection Procedure

Inspection Procedure

  1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE) 
    1. Disconnect the DLC3 sub bus line connector (J40) from the CAN J/C.
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
        Fig 1: Disconnecting DLC3 Sub Bus Line Connector (J40) From CAN J/C
        G02964224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 2.

      Standard: 

      Fig 2: Tester Connection Specified Value Table
      G02964225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
    2. OK: Go to next step. 
      Fig 3: Identifying CG, CANH & CANL Connector Terminals
      G02964226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CONNECT CONNECTOR 
    1. Reconnect the DLC3 sub bus line connector (J40) to the CAN J/C.
    1. NEXT: Go to next step. 
  3. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE) 
    1. Disconnect the skid control ECU sub bus line connector (J41) from the CAN J/C.
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
        Fig 4: Disconnecting Skid Control ECU Sub Bus Line Connector (J41) From CAN J/C
        G02964227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 5.

      Standard: 

      Fig 5: Tester Connection Specified Value Table
      G02964228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: Identifying CG, CANH & CANL Connector Terminals
      G02964229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   10 . 
    2. NG: Go to next step. 
  4. CONNECT CONNECTOR 
    1. Reconnect the skid control ECU sub bus line connector (J41) to the CAN J/C.
    1. NEXT: Go to next step. 
  5. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE) 
    1. Disconnect the yaw rate sensor sub bus line connector (J43) from the CAN J/C.
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
        Fig 7: Disconnecting Yaw Rate Sensor Sub Bus Line Connector (J43) From CAN J/C
        G02964230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 8.

      Standard: 

      Fig 8: Tester Connection Specified Value Table
      G02964231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   12 
    2. NG: Go to next step. 
      Fig 9: Identifying CG, CANH & CANL Connector Terminals
      G02964232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. CONNECT CONNECTOR 
    1. Reconnect the yaw rate sensor sub bus line connector (J43) to the CAN J/C.
    1. NEXT: Go to next step. 
  7. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE) 
    1. Disconnect the steering angle sensor sub bus line connector (J42) from the CAN J/C.
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
        Fig 10: Disconnecting Steering Angle Sensor Sub Bus Line Connector (J42) From CAN J/C
        G02964233Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 12.

      Standard: 

      Fig 11: Tester Connection Specified Value Table
      G02964234Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   14 
    2. NG: Go to next step. 
      Fig 12: Identifying CG, CANH & CANL Connector Terminals
      G02964235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. CONNECT CONNECTOR 
    1. Reconnect the steering angle sensor sub bus line connector (J42) to the CAN J/C.
    1. NEXT: Go to next step. 
  9. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN BUS LINE) 
    1. Disconnect the ECM main bus line connector (J39) from the CAN J/C.
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
        Fig 13: Disconnecting ECM Main Bus Line Connector (J39) From CAN J/C
        G02964236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 14.

      Standard: 

      Fig 14: Tester Connection Specified Value Table
      G02964237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   16 
    2. NG: REPLACE CAN J/C 
      Fig 15: Identifying DLC3 Connector Terminal
      G02964238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. CONNECT CONNECTOR 
    1. Reconnect the skid control ECU sub bus line connector (J41) to the CAN J/C.
    1. NEXT: Go to next step. 
  11. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE) 
    1. Disconnect the skid control ECU connector (S37).
    2. Measure the resistance according to the value(s) in Fig 16.

      Standard: 

      Fig 16: Tester Connection Specified Value Table
      G02964239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 
    2. NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
      Fig 17: Identifying DLC3 Connector Terminal
      G02964240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. CONNECT CONNECTOR 
    1. Reconnect the yaw rate sensor sub bus line connector (J43) to the CAN J/C.
    1. NEXT: Go to next step. 
  13. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE) 
    1. Disconnect the yaw rate sensor connector (Y1).
    2. Measure the resistance according to the value(s) in Fig 18.

      Standard: 

      Fig 18: Tester Connection Specified Value Table
      G02964241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE YAW RATE SENSOR (SEE  YAWRATE SENSOR  ) 
    2. NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
      Fig 19: Identifying DLC3 Connector Terminal
      G02964242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. CONNECT CONNECTOR 
    1. Reconnect the steering angle sub bus line connector (J42) to the CAN J/C.
    1. NEXT: Go to next step. 
  15. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE) 
    1. Disconnect the steering angle sensor connector (S12).
    2. Measure the resistance according to the value(s) in Fig 20.

      Standard: 

      Fig 20: Tester Connection Specified Value Table
      G02964243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE STEERING ANGLE SENSOR (SEE  STEERING SENSOR  ) 
    2. NG: REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
      Fig 21: Identifying DLC3 Connector Terminal
      G02964244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. CONNECT CONNECTOR 
    1. Reconnect the ECM main bus line connector (J39) to the CAN J/C.
    1. NEXT: Go to next step. 
  17. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN BUS LINE) 
    1. Disconnect the ECM connector (E8).
    2. Measure the resistance according to the value(s) in Fig 22.

      Standard: 

      Fig 22: Tester Connection Specified Value Table
      G02964245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE ECM (SEE  ECM (2UZ-FE)  ) 
    2. NG: REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
      Fig 23: Identifying DLC3 Connector Terminal
      G02964246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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