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

Inspection Procedure

  1. CHECK CAN BUS LINES FOR SHORT (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
        G02964177Courtesy 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
      G02964178Courtesy 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 CANH & CANL Connector Terminals
      G02964179Courtesy 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 LINES FOR SHORT (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
        G02964180Courtesy 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
      G02964181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   10 
    2. NG: Go to next step. 
      Fig 6: Identifying CANH & CANL Connector Terminals
      G02964182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 LINES FOR SHORT (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
        G02964183Courtesy 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
      G02964184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   12 . 
    2. NG: Go to next step. 
      Fig 9: Identifying CANH & CANL Connector Terminals
      G02964185Courtesy 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 LINES FOR SHORT (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
        G02964186Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 11.

      Standard: 

      Fig 11: Tester Connection Specified Value Table
      G02964187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   14 
    2. NG: Go to next step. 
      Fig 12: Identifying CANH & CANL Connector Terminals
      G02964188Courtesy 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 LINES FOR SHORT (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
        G02964189Courtesy 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
      G02964190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   16 
    2. NG: REPLACE CAN J/C 
      Fig 15: Identifying CANH & CANL Connector Terminals
      G02964191Courtesy 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 LINES FOR SHORT (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
      G02964192Courtesy 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 CANH & CANL Connector Terminals
      G02964193Courtesy 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 LINES FOR SHORT (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
      G02964194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE YAW RATE SENSOR (SEE  YAW RATE SENSOR  ) 
    2. NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 
      Fig 19: Identifying CANH & CANL Connector Terminals
      G02964195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. CONNECT CONNECTOR 
    1. Reconnect the steering angle sensor sub bus line connector (J42) to the CAN J/C.
    1. NEXT: Go to next step. 
  15. CHECK CAN BUS LINES FOR SHORT (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
      G02964196Courtesy 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
      G02964197Courtesy 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 LINES FOR SHORT (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
      G02964198Courtesy 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 CANH & CANL Connector Terminal
      G02964199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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