CAN COMMUNICATION SYSTEM(for RHD with Entry and Start System) Check Sub Bus Wire Harness

DESCRIPTION

Symptom Trouble Area
All DTCs related to the sub bus are output from the ECM.

  • Local bus circuit

  • ECM

  • Urea pump control ECU

  • Nitrogen oxides sensor

  • No. 7 junction connector

WIRING DIAGRAM

A01XE8IE05

CAUTION / NOTICE / HINT

Tech Tips

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.

      Note


      • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  2. CHECK CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT)


    1. Measure the resistance according to the value(s) in the table below.

      A01XHC5E01
      *1 CANU
      *2 CAND
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      		 - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      G184-27 (CANU) - G184-35 (CAND) Engine switch off 54 to 69 Ω Below 53 Ω: Short in line
      G184-27 (CANU) - G184-35 (CAND) Engine switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      G184-27 (CANU) - G185-1 (BATT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      G184-35 (CAND) - G185-1 (BATT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      G184-27 (CANU) - C152-1 (E1) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      G184-35 (CAND) - C152-1 (E1) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to

      NG


      • Open in CAN main bus line

      		 A

      NG


      • Short in line

      • +B short

      • Ground short

      		 B
      OK C

    B

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 JUNCTION CONNECTOR - NITROGEN OXIDES SENSOR) Click here

    C

    CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND GROUND) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 7 JUNCTION CONNECTOR - UREA PUMP CONTROL ECU)


    1. A01XFWME01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 7 Junction Connector)

      Disconnect the No. 7 junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q41-4 (CANH) - Q41-15 (CANL) Engine switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 7 JUNCTION CONNECTOR - ECM)


    1. A01XGATE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 7 Junction Connector)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q41-5 (CANH) - Q41-16 (CANL) Engine switch off 108 to 132 Ω

    OK

    REPLACE NO. 7 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  5. CONNECT CONNECTOR


    1. Reconnect the Q41 No. 7 junction connector.


    NEXT

  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (UREA PUMP CONTROL ECU - NO. 7 JUNCTION CONNECTOR)


    1. A01XLPBE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Urea Pump Control ECU)

      Disconnect the urea pump control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      s4-27 (CAN+) - s4-26 (CAN-) Engine switch off 108 to 132 Ω

    OK

    REPLACE UREA PUMP CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO UREA PUMP CONTROL ECU (UREA PUMP CONTROL ECU - NO. 7 JUNCTION CONNECTOR)

  7. CONNECT CONNECTOR


    1. Reconnect the Q41 No. 7 junction connector.


    NEXT

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 7 JUNCTION CONNECTOR)


    1. A01XL6QE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G184-27 (CANU) - G184-35 (CAND) Engine switch off 108 to 132 Ω

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 7 JUNCTION CONNECTOR)

  9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 JUNCTION CONNECTOR - NITROGEN OXIDES SENSOR)


    1. A01XJT1E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 7 Junction Connector)
      *b Front view of DLC3

      Disconnect the No. 7 junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q41-6 (CANH) - Q41-17 (CANL) Engine switch off 200 Ω or higher
      Q41-6 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-17 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-6 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      Q41-17 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 JUNCTION CONNECTOR - UREA PUMP CONTROL ECU)


    1. A01XF4ME01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 7 Junction Connector)
      *b Front view of DLC3

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q41-4 (CANH) - Q41-15 (CANL) Engine switch off 108 to 132 Ω
      Q41-4 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-15 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-4 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      Q41-15 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 JUNCTION CONNECTOR - ECM)


    1. A01XHN2E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 7 Junction Connector)
      *b Front view of DLC3

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q41-5 (CANH) - Q41-16 (CANL) Engine switch off 108 to 132 Ω
      Q41-5 (CANH) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-16 (CANL) - G48-4 (CG) Engine switch off 200 Ω or higher
      Q41-5 (CANH) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      Q41-16 (CANL) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NO. 7 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  12. CONNECT CONNECTOR


    1. Reconnect the Q41 No. 7 junction connector.


    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRES (NITROGEN OXIDES SENSOR)


    1. A01XCEXE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Nitrogen Oxides Sensor)
      *b Front view of DLC3

      Disconnect the nitrogen oxides sensor connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      s6-4 (CAN+) - s6-3 (CAN-) Engine switch off 54 to 69 Ω
      s6-4 (CAN+) - G48-4 (CG) Engine switch off 200 Ω or higher
      s6-3 (CAN-) - G48-4 (CG) Engine switch off 200 Ω or higher
      s6-4 (CAN+) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      s6-3 (CAN-) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NITROGEN OXIDES SENSOR Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NITROGEN OXIDES SENSOR (CAN+, CAN-)

  14. CONNECT CONNECTOR


    1. Reconnect the Q41 No. 7 junction connector.


    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRES (UREA PUMP CONTROL ECU)


    1. A01XDSZE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Urea Pump Control ECU)
      *b Front view of DLC3

      Disconnect the urea pump control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      s4-27 (CAN+) - s4-26 (CAN-) Engine switch off 108 to 132 Ω
      s4-27 (CAN+) - G48-4 (CG) Engine switch off 200 Ω or higher
      s4-26 (CAN-) - G48-4 (CG) Engine switch off 200 Ω or higher
      s4-27 (CAN+) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      s4-26 (CAN-) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE UREA PUMP CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO UREA PUMP CONTROL ECU (CAN+, CAN-)

  16. CONNECT CONNECTOR


    1. Reconnect the Q41 No. 7 junction connector.


    NEXT

  17. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. A01XINIE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)
      *b Front view of DLC3

      Disconnect the ECM connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G184-27 (CANU) - G184-35 (CAND) Engine switch off 108 to 132 Ω
      G184-27 (CANU) - G48-4 (CG) Engine switch off 200 Ω or higher
      G184-35 (CAND) - G48-4 (CG) Engine switch off 200 Ω or higher
      G184-27 (CANU) - G48-16 (BAT) Engine switch off 6 kΩ or higher
      G184-35 (CAND) - G48-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANU, CAND)

  18. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      A01XH2UE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the ECM connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C152-1 (E1) - Body ground Always Below 1 Ω
      C151-3 (E01) - Body ground Always Below 1 Ω
      C152-4 (E02) - Body ground Always Below 1 Ω
      C152-3 (ME01) - Body ground Always Below 1 Ω
      G185-8 (EC) - Body ground Always Below 1 Ω

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G185-1 (BATT) - Body ground Always 11 to 14 V
      G185-2 (+B) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V
      G185-3 (+B2) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V
      G185-4 (+B3) - Body ground Battery positive (+) voltage applied to terminal G184-14 (MREL) 11 to 14 V

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR