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Home >> Lexus >> 2003 >> LS 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 923 (Can Communication System - Diagnostics) >> Check Can Bus Lines For Short Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN BUS LINES FOR SHORT (DLC3 SUB BUS LINE) 
    1. Disconnect the DLC3 sub bus line connector (J50) 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.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 1: Disconnecting DLC3 Sub Bus Line Connector (J50) From CAN J/C
      G02579853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: DLC3 Terminals Resistance Specification
      G02579854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Identifying DLC3 Connector Terminals
      G02579855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

    OK: Go to next step. 

  2. CONNECT CONNECTOR 
    1. Reconnect the DLC3 sub bus line connector (J50) to the CAN J/C.

    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 (J47) from the CAN J/C.
      Fig 4: Disconnecting Skid Control ECU Sub Bus Line Connector (J47) From CAN J/C
      G02579856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 5: DLC3 Connector Terminals Resistance Specification
      G02579857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: Identifying DLC3 Connector Terminals
      G02579858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   10 

    NG: Go to next step. 

  4. CONNECT CONNECTOR 
    1. Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.

    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 (J48) 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.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 7: Disconnecting Yaw Rate Sensor Sub Bus Line Connector (J48) From CAN J/C
      G02579859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 8: DLC3 Terminals Resistance Specifications
      G02579860Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Identifying DLC3 Connector Terminals
      G02579861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   12 

    NG: Go to next step. 

  6. CONNECT CONNECTOR 
    1. Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.

    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 (J49) 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.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 10: Disconnecting Steering Angle Sensor Sub Bus Line Connector (J49) From CAN J/C
      G02579862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 11: DLC3 Terminals Resistance Specifications
      G02579863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 12: Identifying DLC3 Terminals
      G02579864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   14 

    NG: Go to next step. 

  8. CONNECT CONNECTOR 
    1. Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.

    NEXT: Go to next step. 

  9. CHECK CAN BUS LINES FOR SHORT (ECM MAIN BUS LINE) 
    1. Disconnect the ECM main bus line connector (J51) 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.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 13: Disconnecting ECM Main Bus Line Connector (J51) From CAN J/C
      G02579865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 14: CAN Bus Line Terminals Resistance Specifications
      G02579866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 15: Identifying DLC3 Connector Terminals
      G02579867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   16 

    NG: Go to next step. 

    REPLACE CAN J/C 

  10. CONNECT CONNECTOR 
    1. Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.

    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 (S28).
    2. Measure the resistance according to the value (s) in the table below.
      Fig 16: CANH - CANL Resistance Specifications
      G02579868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 17: Identifying DLC3 Connector Terminals
      G02579869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 

    NG: Go to next step. 

    REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

  12. CONNECT CONNECTOR 
    1. Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.

    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 the table below.
      Fig 18: CANH - CANL Resistance Specifications
      G02579870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 19: Identifying DLC3 Connector Terminals
      G02579871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE  YAWRATE SENSOR 

    NG: Go to next step. 

    REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

  14. CONNECT CONNECTOR 
    1. Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.

    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 (S11).
    2. Measure the resistance according to the value (s) in the table below.
      Fig 20: CANH - CANL Resistance Specifications
      G02579872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 21: CANH - CANL Resistance Specifications
      G02579873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE STEERING ANGLE SENSOR (  STEERING SENSOR  ) 

    NG: Go to next step. 

    REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

  16. CONNECT CONNECTOR 
    1. Reconnect the ECM main bus line connector (J51) to the CAN J/C.

    NEXT: Go to next step. 

  17. CHECK CAN BUS LINES FOR SHORT (ECM MAIN BUS LINE) 
    1. Disconnect the ECM connector (E7).
    2. Measure the resistance according to the value (s) in the table below.
      Fig 22: Identifying DLC3 Connector Terminals
      G02579874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 23: CANH - CANL Resistance Specifications
      G02579875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE ECM (  ECM (1GR-FE)  (1GR-FE) OR  ECM (2UZ-FE)  (2UZ-FE)) 

    NG: Go to next step. 

    REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

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