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Home >> Toyota >> 2017 >> Camry LE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (Diagnostic Codes (U0104-U1002) & Symptom Tests) (Except Hybrid) >> Can Communication System >> Symptom Tests >> Check CAN Bus Lines for Short Circuit [08/2015 - ] >> Procedure

Check CAN Bus Lines for Short Circuit [08/2015 - ]: Procedure

  1. CHECK FOR SHORT IN CAN BUS LINES (DLC3 BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the I96 DLC3 branch line connector from the CAN No. 1 junction connector.
      GTY315478Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 1 Junction Connector)
      *b to DLC3
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    3. Measure the resistance according to the value(s) in the table below.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 DLC3

    NG → REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3 

    OK: Go to next step 

  2. CHECK FOR SHORT IN CAN BUS LINES (BRANCH LINE) 
    1. Reconnect the I96 DLC3 branch line connector to the CAN No. 1 junction connector.
    2. Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3
    3. While observing the resistance value shown on the tester, disconnect connectors I95, I97, I100, I102, I103, I105, I106, I107, I108 and I111 from the CAN No. 1 junction connector or CAN No. 2 junction connector one by one until the resistance becomes normal (between 54 and 69 Ω).

      HINT: 

      Disconnect the branch line connectors other than those of the DLC3.

      GTY477124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A w/ Intuitive Parking Assist System *B for Tire Pressure Warning System with Tire Inflation Pressure Display Function
      *C w/ Smart Key System *D w/ Network Gateway ECU
      *E for Navigation Receiver Type *F for Radio and Display Type
      *G for 2AR-FE *H for 2GR-FE
      *1 Clearance Warning ECU Assembly *2 Tire Pressure Warning ECU and Receiver
      *3 Air Conditioning Amplifier Assembly *4 ECM
      *5 Brake Actuator Assembly (Skid Control ECU) *6 Smart Key ECU Assembly (Certification ECU)
      *7 Network Gateway ECU *8 Navigation Receiver Assembly
      *9 Radio and Display Receiver Assembly *10 Combination Meter Assembly
      *11 Power Steering ECU with Motor Assembly *12 Power Steering ECU Assembly
      *13 DLC3 *14 Airbag Sensor Assembly
      *15 Steering Sensor *16 Main Body ECU (Multiplex Network Body ECU)
      *17 CAN No. 2 Junction Connector *18 CAN No. 1 Junction Connector
      GTY383195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN No. 1 Junction Connector)      		 - -
      WIRING COLOR

      CAN No. 1 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Main body ECU (Multiplex network body ECU) I95 P W
      Steering sensor I97 V W
      Airbag sensor assembly I103 Y W
      DLC3 I96 L W
      • Power steering ECU with motor assembly*1
      • Power steering ECU assembly*2
      		 I100 G W
      Combination meter assembly I94 R W
      CAN main bus line (bus line connecting CAN No. 1 junction connector and CAN No. 2 junction connector) I93 B W
      • *1: for 2AR-FE
      • *2: for 2GR-FE
      GTY545628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (CAN No. 2 Junction Connector)      		 - -
      WIRING COLOR

      CAN No. 2 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN No. 1 junction connector and CAN No. 2 junction connector) I101 B W
      • Navigation receiver assembly*1
      • Radio and display receiver assembly*2
      		 I107 R W
      Network gateway ECU*3 I108 G W
      Smart key ECU assembly (Certification ECU)*4 I106 L W
      Brake actuator assembly (Skid control ECU) I105 Y W
      Air conditioning amplifier assembly I102 V W
      ECM I104 P W
      • Clearance warning ECU assembly*5
      • Tire pressure warning ECU and receiver*6
      		 I111*5
      I191*6      		 BE W
      • *1: for Navigation Receiver Type
      • *2: for Radio and Display Type
      • *3: w/ Network Gateway ECU
      • *4: w/ Smart Key System
      • *5: w/ Intuitive Parking Assist System
      • *6: for Tire Pressure Warning System with Tire Inflation Pressure Display Function
      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

      Symptom Proceed to
      The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of the 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 J/C, 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 wire harnesses, and to make future maintenance easier.

    B → See step   7 

    A: Go to next step 

  3. CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY MAIN BUS LINE) 
    1. Disconnect the I94 combination meter assembly main bus line connector from the CAN No. 1 junction connector.
      GTY318399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 1 Junction Connector)
      *b to Combination Meter Assembly
      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.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *1 DLC3

      Result

      Symptom Proceed to
      The resistance is still below 54 Ω when the combination meter assembly connector is disconnected. (There are no shorts in the combination meter assembly or between its main bus lines.) A
      The resistance falls within the specified range (between 108 and 132 Ω) (the other terminating resistor is normal) when the combination meter assembly connector is disconnected. (There is a short in the combination meter assembly or between its main bus lines.) B

    B → See step   8 

    A: Go to next step 

  4. CHECK FOR SHORT IN CAN BUS LINES (ECM MAIN BUS LINE) 
    1. Disconnect the I104 ECM main bus line connector from the CAN No. 2 junction connector.
      GTY317070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 2 Junction Connector)
      *b to ECM
      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.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 DLC3

      HINT: 

      Measure the resistance with the I94 combination meter assembly main bus line connector disconnected.

      Result

      Symptom Proceed to
      The resistance is still below 1 MΩ when the ECM connector is disconnected. (There are no shorts in the ECM or between its main bus lines.) A
      The resistance becomes 1 MΩ or more when the ECM connector is disconnected. (There is a short in the ECM or between its main bus lines.) B

    B → See step   9 

    A: Go to next step 

  5. CHECK CAN NO. 1 JUNCTION CONNECTOR 
    1. Disconnect the I93 CAN main bus line connector from the CAN No. 1 junction connector.
      GTY321052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 1 Junction Connector)
      *b to CAN No. 2 Junction Connector
      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.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 DLC3

    NG → REPLACE CAN NO. 1 JUNCTION CONNECTOR 

    OK: Go to next step 

  6. CHECK CAN NO. 2 JUNCTION CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C) 
    1. Reconnect the I93 CAN main bus line connector to the CAN No. 1 junction connector.
    2. Disconnect the I101 CAN main bus line connector from the CAN No. 2 junction connector.
      GTY316421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN No. 2 Junction Connector)
      *b to CAN No. 1 Junction Connector
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    3. Measure the resistance according to the value(s) in the table below.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 DLC3

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

    OK → REPLACE CAN NO. 2 JUNCTION CONNECTOR 

  7. CHECK FOR SHORT IN CAN BUS LINES (ECU, SENSOR) 
    1. Reconnect the connector for the short-circuited branch line to the CAN J/C (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).
    2. Disconnect the connector that includes the DLC3 connected CAN lines (such as CANH and CANL) from the ECU or sensor to which the short-circuited branch line is connected. Refer to TERMINALS OF ECU [08/2015 - ] .
    3. Measure the resistance according to the value(s) in the table below.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *1 DLC3

      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.

    NG → REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

    OK → REPLACE CORRESPONDING ECU OR SENSOR 

  8. CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY) 
    1. Reconnect the I94 combination meter assembly main bus line connector to the CAN No. 1 junction connector.
    2. Disconnect the I18 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *1 DLC3

      HINT: 

      If the resistance becomes normal (between 108 to 132 Ω) when the connector is disconnected, there may be a short in the combination meter assembly.

    NG → REPAIR OR REPLACE CAN BUS MAIN LINES (COMBINATION METER ASSEMBLY MAIN BUS LINES) 

    OK → See step   10 

  9. CHECK FOR SHORT IN CAN BUS LINES (ECM) 
    1. Reconnect the I104 ECM main bus line connector to the CAN No. 2 junction connector.
    2. Disconnect the A25 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY318384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I39-6 (CANH) - I39-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 DLC3

      Result

      Result Proceed to
      OK (for 2GR-FE) A
      OK (for 2AR-FE) B
      NG C

      HINT: 

      • Measure the resistance with the I94 combination meter assembly main bus line connector disconnected.
      • If the resistance changes to 1 MΩ or more when the connector is disconnected, there may be a short in the ECM.

    B → See step   12 

    C → REPAIR OR REPLACE CAN BUS MAIN LINES (ECM MAIN BUS LINES) 

    A → See step   11 

  10. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  11. REPLACE ECM. Refer to  REMOVAL [08/2015 - ] 
  12. REPLACE ECM. Refer to  REMOVAL [08/2015 - ] 
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