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Check Bus 2 Lines for Short Circuit [10/2015 - ]: Procedure

  1. CHECK FOR SHORT IN BUS 2 LINES (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-)auxiliary battery terminal.
    2. Disconnect the D131 wire harness connector.
      GTY538907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to Central Gateway ECU
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D131-1 (CANH) - D131-2 (CANL) Cable disconnected from negative (-)auxiliary battery terminal 200 Ω or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  2

  2. CHECK FOR SHORT IN BUS 2 LINES (BRANCH LINE) 
    1. Reconnect the D131 wire harness connector.
    2. Connect the probes of an electrical tester to terminals 1 (CANH) and 2 (CANL) of the central gateway ECU branch line harness connector.
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    3. While observing the resistance value shown on the tester, disconnect connectors (D79, D83, D112 and D113) from the No. 2 CAN junction connector or (D74, D76, D114, D115 and D130) from the No. 1 CAN junction connector one by one until the resistance becomes normal (between 54 and 69 Ω).
      GTY608787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)      		 - -
      WIRING COLOR:

      No. 2 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D78 B W
      Air conditioning amplifier assembly D79 BR W
      ECM D81 P W
      Certification ECU (smart key ECU assembly) D83 L W
      Airbag ECU assembly D113 LG W
      Central gateway ECU D131 SB W
      Power steering ECU assembly D112 G W
      GTY588915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 1 CAN Junction Connector)      		 - -
      WIRING COLOR:

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Skid control ECU (brake booster with master cylinder assembly) D115 Y W
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D72 B W
      Steering sensor D76 V W
      Tire pressure warning ECU and receiver D130 SB W
      Main body ECU (multiplex network body ECU) D74 P W
      Combination meter assembly D73 R W
      Hybrid vehicle control ECU assembly D114 G W
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      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 wire harnesses, and to make future maintenance easier.

      Result

      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
    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.

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  3

  3. CHECK FOR SHORT IN BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D78 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D131-1 (CANH) - D131-2 (CANL) Cable disconnected from negative (-)auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. CHECK FOR SHORT IN BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D78 wire harness connector.
    2. Disconnect the D72 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D131-1 (CANH) - D131-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      Result

      Result
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  5

  5. CHECK FOR SHORT IN BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D72 wire harness connector.
    2. Disconnect the D73 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D131-1 (CANH) - D131-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK FOR SHORT IN BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 
    1. Reconnect the D73 wire harness connector.
    2. Disconnect the D9 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D131-1 (CANH) - D131-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 

  7. CHECK FOR SHORT IN BUS 2 LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D81 wire harness connector.
      GTY575394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to ECM
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D81-2 (CANL) Cable disconnected from negative (-)auxiliary battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  8

  8. CHECK FOR SHORT IN BUS 2 LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D81 wire harness connector.
    2. Reconnect the D78 wire harness connector.
    3. Disconnect the A18 ECM connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-13 (CANH) - A18-26 (CANL) Cable disconnected from negative (-)auxiliary battery terminal 108 to 132 Ω
      GTY572929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

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

  9. CHECK FOR SHORT IN BUS 2 LINES (ECU, SENSOR) 
    1. Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).
      GTY581998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected.

      Refer to TERMINALS OF ECU [10/2015 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D81-2 (CANL) Cable disconnected from negative (-)auxiliary 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, there may be a short in the ECU.

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

  10. CHECK FOR SHORT IN BUS 2 LINES (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D131 wire harness connector.
    2. Disconnect the D129 central gateway ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D129-18 (CA4H) - D129-17 (CA4L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      GTY546664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU. Refer to  REMOVAL [10/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN BUS BRANCH LINES OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 

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