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Home >> Toyota >> 2016 >> Highlander Limited, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> Can Communication System >> DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [12/2013 - 11/2015] >> Procedure

DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [12/2013 - 11/2015]: Procedure

  1. CHECK SUB BUS 2 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY439628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      F85-13 (CA2H) - F85-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or higher: Open circuit in a main bus line
      F85-13 (CA2H) - F85-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      F85-12 (CA2L) - F85-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      F85-13 (CA2H) - F85-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      F85-12 (CA2L) - F85-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B 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

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  7

    Result: 

    D 

    See step  15

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC OUTPUT 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Clear the DTCs.

      Body Electrical > Gateway > Clear DTCs 

    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON.
    8. Check for DTCs.

      Body Electrical > Gateway > Trouble Codes 

      Result

      Result Proceed to
      DTC U1002 is not output A
      DTC U1002 is output B

    Result: 

    A 

    SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016] 

    Result: 

    B 

    REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [12/2013 - 11/2016] 

  3. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU) 
    1. Disconnect the F85 network gateway ECU connector.
      GTY454640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Network Gateway ECU)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F85-13 (CA2H) - F85-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [12/2013 - 11/2016] 

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN JUNCTION TERMINAL) 
    1. Reconnect the F85 network gateway ECU connector.
    2. Disconnect the M42 CAN junction terminal connector.
      GTY437888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to CAN Junction Terminal)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M42-3 (CANH) - M42-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE CAN JUNCTION TERMINAL 

    Result: 

    NG 

    See step  5

  5. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the M42 CAN junction terminal connector.
    2. Disconnect the F104 and F105 wire harness connectors.
      GTY440072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
      *c to Network Gateway ECU
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      F104-1 (CANH) - F104-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      F105-1 (CANH) - F105-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Network gateway ECU
      WIRING COLOR:

      Code Color (CANH Side) Color (CANL Side) Connected to
      F104 BR W No. 2 CAN junction connector
      F105 L W Network gateway ECU
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      Result

      Result Proceed to
      OK A
      NG (Network gateway ECU main line) B
      NG (No. 2 CAN junction connector main line) C

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    See step  6

  6. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the F104 and F105 wire harness connectors.
    2. Disconnect the M38 and M41 wire harness connectors.
      GTY437219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to No. 1 CAN Junction Connector
      *c to CAN Junction Terminal
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      M38-1 (CANH) - M38-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      M41-1 (CANH) - M41-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN junction terminal
      WIRING COLOR:

      Code Color (CANH Side) Color (CANL Side) Connected to
      M38 BR W No. 1 CAN junction connector
      M41 B W CAN junction terminal
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      Result

      Result Proceed to
      OK A
      NG (No. 1 CAN junction connector main line) B
      NG (CAN junction terminal main line) C

    Result: 

    A 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    B 

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

    Result: 

    C 

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

  7. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR - NETWORK GATEWAY ECU) 
    1. Disconnect the F105 wire harness connector.
      GTY442861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to Network Gateway ECU
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F105-1 (CANH) - F105-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  8

  8. CHECK FOR SHORT IN SUB BUS 2 LINES (BRANCH LINE) 
    1. Reconnect the F105 wire harness connector.
    2. Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the network gateway ECU main line harness connector.
      GTY443972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to Network Gateway ECU
    3. While observing the resistance value shown on the tester, disconnect the F108, F109, F110, M39 and M40 connectors from the No. 1 CAN junction connector or No. 2 CAN junction connector one by one until the resistance becomes normal (between 54 and 69 Ω).
      GTY454101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Pre-collision System *B w/ Lane Departure Alert System
      *C w/ Parking Assist Monitor System *D w/ Blind Spot Monitor System
      *1 Network Gateway ECU *2 Driving Support ECU Assembly
      *3 Option Connector (Bus Buffer ECU) *4 Lane Departure Warning Camera
      *5 Television Camera Assembly *6 Blind Spot Monitor Sensor LH
      *7 CAN Junction Terminal *8 No. 1 CAN Junction Connector
      *9 No. 2 CAN Junction Connector - -
      GTY443198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 1 CAN Junction Connector)      		 - -

      Wiring Color

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      No. 2 CAN junction connector F104 BR W
      Network gateway ECU F105 L W
      Lane departure warning camera*1 F108 R W
      Option connector (bus buffer ECU) F109 P W
      Driving support ECU assembly*2 F110 G W
      *1: w/ Lane Departure Alert System
      *2: w/ Pre-collision System
      GTY442859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 2 CAN Junction Connector)      		 - -

      Wiring Color

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      No. 1 CAN junction connector M38 BR W
      Television camera assembly*1 M39 B W
      Blind spot monitor sensor LH*2 M40 GR W
      CAN junction terminal M41 B W
      *1: w/ Parking Assist Monitor System
      *2: w/ Blind Spot Monitor System
      NOTE:

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.

      Result

    4. When there is a short in one or more of the branch lines:
      1. Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.

        HINT: 

        • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
        • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
    Result Proceed to
    The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of branch lines.) A
    The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short between one or more pairs of branch lines.) B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  9

  9. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR - CAN JUNCTION TERMINAL) 
    1. Disconnect the M41 wire harness connector.
      GTY452410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to CAN Junction Terminal
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M41-1 (CANH) - M41-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  10

  10. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the F104 wire harness connector.
      GTY435102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F104-1 (CANH) - F104-2 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

    Result: 

    OK 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  11

  11. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the M38 wire harness connector.
      GTY424238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to No. 1 CAN Junction Connector
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M38-1 (CANH) - M38-2 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

    Result: 

    OK 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

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

  12. CHECK FOR SHORT IN SUB BUS 2 LINES (CAN JUNCTION TERMINAL) 
    1. Reconnect the M41 wire harness connector.
    2. Disconnect the M42 CAN junction terminal connector.
      GTY445172Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to CAN Junction Terminal)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M42-3 (CANH) - M42-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE CAN JUNCTION TERMINAL 

    Result: 

    NG 

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

  13. CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR) 
    1. Reconnect all wire harness connectors (No. 1 CAN junction connector and No. 2 CAN 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.

      Refer to TERMINALS OF ECU [12/2013 - 11/2015]

      GTY439626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Network Gateway ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F85-13 (CA2H) - F85-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      HINT: 

      • 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.

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINES OR CONNECTOR 

  14. CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU) 
    1. Reconnect the F105 wire harness connector.
    2. Disconnect the F85 network gateway ECU connector.
      GTY439174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Network Gateway ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F85-13 (CA2H) - F85-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [12/2013 - 11/2016] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR) 

  15. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION CONNECTOR - CAN JUNCTION TERMINAL) 
    1. Disconnect the M41 wire harness connector.
      GTY427641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to CAN Junction Terminal
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      M41-1 (CANH) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      M41-2 (CANL) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      M41-1 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      M41-2 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      HINT: 

      • 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 2 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 2 inspection.

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  16

  16. CHECK FOR SHORT IN SUB BUS 2 LINE 
    1. Reconnect the M41 wire harness connector.
    2. Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the M41 wire harness connector and CG or BAT of the DLC3.
      GTY454360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)

      HINT: 

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

    3. While observing the resistance value shown on the ohmmeter, disconnect the F105, F108, F109, F110, M39 and M40 connectors from the No. 1 CAN junction connector and No. 2 CAN junction connector until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).
      GTY454101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Pre-collision System *B w/ Lane Departure Alert System
      *C w/ Parking Assist Monitor System *D w/ Blind Spot Monitor System
      *1 Network Gateway ECU *2 Driving Support ECU Assembly
      *3 Option Connector (Bus Buffer ECU) *4 Lane Departure Warning Camera
      *5 Television Camera Assembly *6 Blind Spot Monitor Sensor LH
      *7 CAN Junction Terminal *8 No. 1 CAN Junction Connector
      *9 No. 2 CAN Junction Connector - -
      GTY443198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 1 CAN Junction Connector)      		 - -

      Wiring Color

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      No. 2 CAN junction connector F104 BR W
      Network gateway ECU F105 L W
      Lane departure warning camera*1 F108 R W
      Option connector (bus buffer ECU) F109 P W
      Driving support ECU assembly*2 F110 G W
      *1: w/ Lane Departure Alert System
      *2: w/ Pre-collision System
      GTY442859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 2 CAN Junction Connector)      		 - -

      Wiring Color

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      No. 1 CAN junction connector M38 BR W
      Television camera assembly*1 M39 B W
      Blind spot monitor sensor LH*2 M40 GR W
      CAN junction terminal M41 B W
      *1: w/ Parking Assist Monitor System
      *2: w/ Blind Spot Monitor System

      Result

      Result Proceed to
      The resistance between terminals CANH and BAT, or the resistance between terminals CANL and BAT is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.
      (There is a short to +B in the CAN main bus lines between the No. 1 CAN junction connector and No. 2 CAN junction connector.)      		 A
      The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.
      (There is a short to GND in the CAN main bus lines between the No. 1 CAN junction connector and No. 2 CAN junction connector.)
      The resistance between terminals CANH and BAT, or the resistance between terminals CANL and BAT becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.
      (There is a short to +B in one of the areas that relate to one or more of the disconnected bus lines.)      		 B
      The resistance between terminals CANH and GND, or the resistance between terminals CANL and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.
      (There is a short to GND in one of the areas that relate to the disconnected bus lines.)

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  17

  17. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect all wire harness connectors (No. 1 CAN junction connector and No. 2 CAN junction connector).
    2. Disconnect the M38 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY445433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to CAN Junction Terminal

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      M41-1 (CANH) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      M41-2 (CANL) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      M41-1 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      M41-2 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      HINT: 

      • 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 2 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 2 inspection.

    Result: 

    NG 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    OK 

    See step  18

  18. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the M38 wire harness connector.
    2. Disconnect the F104 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY442064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to CAN Junction Terminal

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      M41-1 (CANH) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      M41-2 (CANL) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      M41-1 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      M41-2 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      HINT: 

      • 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 2 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 2 inspection.

    Result: 

    OK 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

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

  19. CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR) 
    1. Reconnect all wire harness connectors (No. 1 CAN junction connector and No. 2 CAN junction connector).
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B or shorted to GND is connected.

      Refer to TERMINALS OF ECU [12/2013 - 11/2015]

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      M41-1 (CANH) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      M41-2 (CANL) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      M41-1 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      M41-2 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      GTY454360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)

      HINT: 

      • 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 2 inspection.
      • If the resistance becomes normal when the connector is disconnected from the ECU, there may be a short in the ECU.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 2 inspection.

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINES OR CONNECTOR 

  20. CHECK FOR SHORT IN SUB BUS 2 LINE (CAN JUNCTION TERMINAL) 
    1. Reconnect the M41 wire harness connector.
    2. Disconnect the M42 CAN junction terminal connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY455060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Front view of wire harness connector
      (to CAN Junction Terminal)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      M42-3 (CANH) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      M42-2 (CANL) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      M42-3 (CANH) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      M42-2 (CANL) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      HINT: 

      • 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 2 inspection.
      • Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 2 inspection.

    Result: 

    OK 

    REPLACE CAN JUNCTION TERMINAL 

    Result: 

    NG 

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

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