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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 >> DTC U1002: Lost Communication with Gateway Module (Sensor Bus); DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [08/2015 - ] >> Procedure

DTC U1002: Lost Communication with Gateway Module (Sensor Bus); DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor [08/2015 - ]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      Result

      Result Proceed to
      DTC U0104 is not output from the network gateway ECU
      (Techstream display: Gateway)      		 A
      DTC U0104 is output from the network gateway ECU
      (Techstream display: Gateway)      		 B

    B → See step   13 

    A: Go to next step 

  2. CHECK SUB BUS 13 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Measure the resistance according to the value(s) in the table below.
      GTY472595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      I187-40 (CA1P) - I187-18 (CA1N) 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 main bus lines
      I187-40 (CA1P) - I187-25 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      I187-18 (CA1N) - I187-25 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      I187-40 (CA1P) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      I187-18 (CA1N) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Component with harness connected
      (Driving Support ECU Assembly)

      Result

      Result Proceed to
      OK A
      Open circuit in CAN main bus lines B
      Short circuit between bus lines C
      • Ground short
      • +B short
      		 D

    B → See step   5 

    C → See step   8 

    D → See step   9 

    A: Go to next step 

  3. CHECK FOR POWER SOURCE CIRCUIT (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Check the millimeter wave radar sensor assembly power source circuit. Refer to Millimeter Wave Radar Sensor Power Source Circuit [08/2015 - ] .

      OK

      The millimeter wave radar sensor assembly power source circuit is normal.

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 

    OK: Go to next step 

  4. CHECK FOR DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs.
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON.
    7. Check for DTCs.

      Result

      Result Proceed to
      DTC U1002 is not output from the driving support ECU assembly (Techstream display: Pre-collision2) A
      DTC U1002 is output from the driving support ECU assembly (Techstream display: Pre-collision2) B

    B → See step   6 

    A → See step   14 

  5. CHECK FOR OPEN IN SUB BUS 13 MAIN LINES (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the I187 driving support ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY478286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I187-40 (CA1P) - I187-18 (CA1N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

    NG → See step   10 

    OK → See step   15 

  6. REPLACE DRIVING SUPPORT ECU ASSEMBLY 
    1. Replace the driving support ECU assembly. Refer to REMOVAL [08/2015 - ] .

    NEXT: Go to next step 

  7. 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. Check for DTCs.
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON.
    8. Turn the Techstream on.
    9. Enter the following menus: Body Electrical / Gateway / Trouble Codes.

      Result

      Result Proceed to
      DTC U1002 is not output from the driving support ECU assembly
      (Techstream display: Pre-collision2)      		 A
      DTC U1002 is output from the driving support ECU assembly
      (Techstream display: Pre-collision2)      		 B

    B → See step   16 

    A → END 

  8. CHECK FOR SHORT IN SUB BUS 13 LINES (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the I187 driving support ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY478286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      I187-40 (CA1P) - I187-18 (CA1N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

    NG → See step   11 

    OK → See step   15 

  9. CHECK FOR SHORT IN SUB BUS 13 LINE (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the I187 driving support ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY479219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      I187-40 (CA1P) - I187-25 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      I187-18 (CA1N) - I187-25 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      I187-40 (CA1P) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      I187-18 (CA1N) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      TEXT IN ILLUSTRATION

      *1 DLC3
      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      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 13 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 13 inspection.

    NG → See step   12 

    OK → See step   15 

  10. CHECK FOR OPEN IN SUB BUS 13 MAIN LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Reconnect the I187 driving support ECU assembly connector.
    2. Disconnect the A85 millimeter wave radar sensor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY479452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A85-3 (CA1P) - A85-2 (CA1N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Millimeter Wave Radar Sensor Assembly)

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR 

    OK → See step   16 

  11. CHECK FOR SHORT IN SUB BUS 13 LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Reconnect the I187 driving support ECU assembly connector.
    2. Disconnect the A85 millimeter wave radar sensor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY479452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A85-3 (CA1P) - A85-2 (CA1N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Millimeter Wave Radar Sensor Assembly)

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR 

    OK → See step   16 

  12. CHECK FOR SHORT IN SUB BUS 13 LINE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Reconnect the I187 driving support ECU assembly connector.
    2. Disconnect the A85 millimeter wave radar sensor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY481304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3 - -
      *a Front view of wire harness connector
      (to Millimeter Wave Radar Sensor Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A85-3 (CA1P) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      A85-2 (CA1N) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      A85-3 (CA1P) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      A85-2 (CA1N) - I39-16 (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 13 inspection.
      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 13 inspection.

    NG → REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR 

    OK → See step   16 

  13. GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U0104: Lost Communication with Driving Support ECU [08/2015 - ]  
  14. SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] 
  15. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  16. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
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