CAN COMMUNICATION SYSTEM (for RHD), Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
U1002 Network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 19.

  • Open or short in sub bus 19 main line or connector

  • Open or short in sub bus 19 branch line or connector

  • ECM

  • Front steering control ECU

  • Network gateway ECU

  • Absorber control ECU*1

  • Power steering ECU assembly

  • Driving support ECU assembly*2

  • Brake actuator assembly (skid control ECU)

  • Rear steering control ECU

  • Open or short in No. 1 junction connector

  • Open or short in No. 2 junction connector

  • Open or short in No. 4 junction connector

  • Open or short in No. 9 junction connector

WIRING DIAGRAM

A01FEOOE02
A01FFUQE01

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 20 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK SUB BUS 19


    1. A01FHUQE15
      Text in Illustration
      *a

      Component with harness connected

      (No. 9 Junction Connector)
      *b Front view of DLC3

      Disconnect the cable from the negative (-) battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Resistance: Malfunction
      U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      U56-3 (CANH) - U56-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      U56-2 (CANL) - U56-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN CAN BUS LINES (ECM) Click here

    C

    CHECK FOR SHORT IN CAN BUS LINES (ECM) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Clear the DTCs.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG) check for DTCs.

      Result
      Result Proceed to
      U1002 is output from network gateway ECU (GTS display / Multi Bus Monitor 2) A
      Other DTC is output B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

    A

    REPLACE NETWORK GATEWAY ECU Click here

  3. CHECK FOR OPEN IN CAN BUS LINES (ECM)


    1. A01FGQ0E11
      Text in Illustration
      *A except AA81E
      *B for AA81E
      *a

      Rear 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
      except AA81E
      Tester Connection Condition Specified Condition
      A21-10 (CANU) - A21-9 (CAND) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for AA81E
      Tester Connection Condition Specified Condition
      A21-18 (CANU) - A21-17 (CAND) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 2GR-FSE) A
      OK (for 4GR-FSE) B
      NG C

    B

    REPLACE ECM Click here

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here

    A

    REPLACE ECM Click here

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)


    1. A01FIKIE89
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b to ECM
      *c to No. 1 Junction Connector

      Reconnect the ECM connector.

    2. Disconnect the wire harness connector from the No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N134-1 (CANH) - N134-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-5 (CANH) - N134-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to ECM main bus line) B
      NG (to No. 1 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - ECM)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR)


    1. A01FIKIE62
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b to No. 4 Junction Connector
      *c to No. 2 Junction Connector

      Reconnect the wire harness connector from the No. 2 junction connector.

    2. Disconnect the wire harness connector from the No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N132-2 (CANH) - N132-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-5 (CANH) - N132-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR)


    1. A01FIKIE63
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)
      *b to No. 9 Junction Connector
      *c to No. 1 Junction Connector

      Reconnect the wire harness connector from the No. 1 junction connector.

    2. Disconnect the wire harness connector from the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U54-5 (CANH) - U54-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-6 (CANH) - U54-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 9 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  7. CHECK FOR OPEN IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR)


    1. A01FDXIE33
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 9 Junction Connector)

      Reconnect the wire harness connector from the No. 4 junction connector.

    2. Disconnect the wire harness connector from the No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 9 JUNCTION CONNECTOR

  8. CHECK FOR SHORT IN CAN BUS LINES (ECM)


    1. A01FGQ0E11
      Text in Illustration
      *A except AA81E
      *B for AA81E
      *a

      Rear 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
      except AA81E
      Tester Connection Condition Specified Condition
      A21-10 (CANU) - A21-9 (CAND) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for AA81E
      Tester Connection Condition Specified Condition
      A21-18 (CANU) - A21-17 (CAND) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 2GR-FSE) A
      OK (for 4GR-FSE) B
      NG C

    B

    REPLACE ECM Click here

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here

    A

    REPLACE ECM Click here

  9. CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)


    1. A01FIKIE93
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b to ECM
      *c to Brake Actuator Assembly (Skid Control ECU)
      *d to Absorber Control ECU
      *e to No. 1 Junction Connector
      *f to Driving Support ECU Assembly

      Reconnect the ECM connector.

    2. Disconnect the wire harness connector from the No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N134-1 (CANH) - N134-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-2 (CANH) - N134-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N134-3 (CANH) - N134-14 (CANL)*1 Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N134-5 (CANH) - N134-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-6 (CANH) - N134-17 (CANL)*2 Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *1: w/ Adaptive Variable Suspension System

      • *2: w/ Dynamic Radar Cruise Control System

      Result
      Result Proceed to
      OK A
      NG (to ECM main bus line) B
      NG (to No. 1 junction connector main bus line) C
      NG (to Brake actuator assembly [skid control ECU] branch bus line) D
      NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System])
      NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control System])

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - ECM)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  10. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR)


    1. A01FIKIE91
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b to No. 4 Junction Connector
      *c to Front Steering Control ECU
      *d to Network Gateway ECU
      *e to No. 2 Junction Connector
      *f to Power Steering ECU Assembly

      Reconnect the wire harness connector from the No. 2 junction connector.

    2. Disconnect the wire harness connector from the No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N132-2 (CANH) - N132-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-3 (CANH) - N132-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N132-4 (CANH) - N132-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N132-5 (CANH) - N132-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-6 (CANH) - N132-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C
      NG (to Front steering control ECU branch bus line) D
      NG (to Network gateway ECU branch bus line)
      NG (to Power steering ECU assembly branch bus line)

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  11. CHECK FOR SHORT IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR)


    1. A01FIKIE77
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)
      *b to No. 9 Junction Connector
      *c to No. 1 Junction Connector
      *d to Rear Steering Control ECU

      Reconnect the wire harness connector from the No. 1 junction connector.

    2. Disconnect the wire harness connector from the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U54-5 (CANH) - U54-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-6 (CANH) - U54-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-7 (CANH) - U54-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 9 junction connector main bus line) C
      NG (to Rear steering control ECU branch bus line) D

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  12. CHECK FOR SHORT IN CAN BUS LINES (NO. 9 JUNCTION CONNECTOR)


    1. A01FDXIE33
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 9 Junction Connector)

      Reconnect the wire harness connector from the No. 4 junction connector.

    2. Disconnect the wire harness connector from the No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 9 JUNCTION CONNECTOR

  13. CHECK FOR SHORT IN CAN BUS LINES (ECUS)


    1. A01FDOPE05
      Text in Illustration
      *a

      Component with harness connected

      (No. 9 Junction Connector)

      Reconnect all wire harness connectors (No. 1 junction connector, No. 2 junction connector and No. 4 junction connector).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU (or sensor) to which the short-circuited branch line is connected Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U56-3 (CANH) - U56-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips


      • If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU (or sensor), there may be a short in the ECU (or sensor).

      • If the resistance does not become normal (between 54 and 69 Ω) when the connector is disconnected from the ECU (or sensor), repair or replace the short-circuited branch line or connector.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU

  14. CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR)


    1. Disconnect the wire harness connector from the No. 2 junction connector.

      A01FE57E23
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      		 *b Front view of DLC3
      *c to ECM *d to Brake Actuator Assembly (Skid Control ECU)
      *e to Absorber Control ECU *f to No. 1 Junction Connector
      *g to Driving Support ECU Assembly - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      N134-1 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short ECM
      N134-12 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-2 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Brake actuator assembly (skid control ECU)
      N134-13 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Absorber control ECU*1
      N134-14 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-5 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 1 junction connector
      N134-16 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-6 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Driving support ECU assembly*2
      N134-17 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-1 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      N134-12 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-2 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Brake actuator assembly (skid control ECU)
      N134-13 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Absorber control ECU*1
      N134-14 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-5 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 1 junction connector
      N134-16 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-6 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Driving support ECU assembly*2
      N134-17 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *1: w/ Adaptive Variable Suspension System

      • *2: w/ Dynamic Radar Cruise Control System

      Result
      Result Proceed to
      OK A
      NG (to ECM main bus line) B
      NG (to No. 1 junction connector main bus line) C
      NG (to Brake actuator assembly [skid control ECU] branch bus line) D
      NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System])
      NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control System])

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 19 inspection.


    B

    CHECK FOR SHORT IN CAN BUS LINE (ECM) Click here

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 1 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  15. CHECK FOR SHORT IN CAN BUS LINE (ECM)


    1. A01FGWNE08
      Text in Illustration
      *A except AA81E
      *B for AA81E
      *a

      Rear view of wire harness connector

      (to ECM)
      *b Front view of DLC3

      Reconnect the wire harness connector from the No. 2 junction connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      except AA81E
      Tester Connection Condition Specified Condition
      A21-10 (CANU) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A21-9 (CAND) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A21-10 (CANU) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A21-9 (CAND) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      for AA81E
      Tester Connection Condition Specified Condition
      A21-18 (CANU) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A21-17 (CAND) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A21-18 (CANU) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A21-17 (CAND) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Result
      Result Proceed to
      OK (for 2GR-FSE) A
      OK (for 4GR-FSE) B
      NG C

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 19 inspection.


    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (ECM - NO. 2 JUNCTION CONNECTOR)

    A

    REPLACE ECM Click here

  16. CHECK FOR SHORT IN CAN BUS LINE (NO. 1 JUNCTION CONNECTOR)


    1. Reconnect the wire harness connector from the No. 2 junction connector.

      A01FE57E24
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 4 Junction Connector *d to Front Steering Control ECU
      *e to Network Gateway ECU *f to No. 2 Junction Connector
      *g to Power Steering ECU Assembly - -

    2. Disconnect the wire harness connector from the No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      N132-2 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 4 junction connector
      N132-13 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Front steering control ECU
      N132-14 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-4 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Network gateway ECU
      N132-15 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-5 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 2 junction connector
      N132-16 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-6 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Power steering ECU assembly
      N132-17 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-2 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 4 junction connector
      N132-13 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Front steering control ECU
      N132-14 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-4 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Network gateway ECU
      N132-15 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-5 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 2 junction connector
      N132-16 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-6 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Power steering ECU assembly
      N132-17 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C
      NG (to Front steering control ECU branch bus line) D
      NG (to Network gateway ECU branch bus line)
      NG (to Power steering ECU assembly branch bus line)

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 19 inspection.


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 4 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  17. CHECK FOR SHORT IN CAN BUS LINE (NO. 4 JUNCTION CONNECTOR)


    1. Reconnect the wire harness connector from the No. 1 junction connector.

      A01FE57E07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 9 Junction Connector *d to No. 1 Junction Connector
      *e to Rear Steering Control ECU - -

    2. Disconnect the wire harness connector from the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      U54-5 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 9 junction connector
      U54-16 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-6 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 1 junction connector
      U54-17 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Rear steering control ECU
      U54-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-5 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 9 junction connector
      U54-16 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-6 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 1 junction connector
      U54-17 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Rear steering control ECU
      U54-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 9 junction connector main bus line) C
      NG (to Rear steering control ECU branch bus line) D

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 19 inspection.


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 9 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  18. CHECK FOR SHORT IN CAN BUS LINE (NO. 9 JUNCTION CONNECTOR)


    1. A01FENVE08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 9 Junction Connector)
      *b Front view of DLC3

      Reconnect the wire harness connector from the No. 4 junction connector.

    2. Disconnect the wire harness connector from the No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U56-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U56-2 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Tech Tips

      It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 19 inspection.


    NG

    REPAIR CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 9 JUNCTION CONNECTOR

  19. CHECK FOR SHORT IN CAN BUS LINE (ECUS)


    1. A01FHUQE15
      Text in Illustration
      *a

      Component with harness connected

      (No. 9 Junction Connector)
      *b Front view of DLC3

      Reconnect all wire harness connectors (No. 1 junction connector, No. 2 junction connector and No. 4 junction connector).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to B+ or shorted to GND is connected.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U56-3 (CANH) - U56-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U56-2 (CANL) - U56-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U56-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      U56-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check sub bus 19 inspection.

      • If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU