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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

    HINT:

    Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  1. CHECK DLC3 
    1. Turn the ignition switch OFF.
    2. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition Proceed to
      D15-6 (CANH)-D15-14 (CANL) Ignition switch OFF 108 to 132 Ω A
      D15-6(CANH)-D15-14 (CANL) Ignition switch OFF 132 Ω or higher B
      NOTE: When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING " after repairing the trouble area.
      Fig 1: Checking CAN Bus Wire (Main Wire For Disconnection, Bus Lines For Short Circuit)
      G04835710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L) 

    A: GO TO NEXT STEP 

  2. CHECK CAN MAIN WIRE FOR DISCONNECTION (D-CAN SIDE) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D42 P-CAN J/C connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      D42-11(TOLH)-D42-22 (TOLH) Ignition switch OFF 108 to 132 Ω
      4. Fig 2: Checking CAN Main Wire For Disconnection (D-CAN Side)
      G04835715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to step  8

    NG: GO TO NEXT STEP 

  3. CONNECT CONNECTOR 
    1. Reconnect the P-CAN J/C connector.

    NEXT: GO TO NEXT STEP 

  4. CHECK CAN MAIN WIRE FOR DISCONNECTION (ECM) 
    1. Turn the ignition switch OFF.
    2. Disconnect the A21 ECM connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      A21-41(CANH)-A21-49 (CANL) Ignition switch OFF 108 to 132 Ω
      4. Fig 3: Checking CAN Main Wire For Disconnection (ECM)
      G04835716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

    NG: GO TO NEXT STEP 

  5. CONNECT CONNECTOR 
    1. Reconnect the ECM connector.

    NEXT: GO TO NEXT STEP 

  6. CHECK CAN MAIN WIRE FOR DISCONNECTION (D-CAN J/C - ECM) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D41 D-CAN J/C connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      D41-4(EFI)-D41-15 (EFI) Ignition switch OFF 108 to 132 Ω
      4. Fig 4: Checking CAN Main Wire For Disconnection (D-CAN J/C - ECM)
      G04835717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - ECM (CAN-H, CAN-L)) 

    OK: GO TO NEXT STEP 

  7. CHECK CAN MAIN WIRE FOR DISCONNECTION (D-CAN J/C - P-CAN J/C) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D41 D-CAN J/C connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      D42-11 (TORH) - D42-22 (TORH) Ignition switch OFF 108 to 132 Ω
      4. Fig 5: Checking CAN Main Wire For Disconnection (D-CAN J/C - P-CAN J/C)
      G04835718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - P-CAN J/C (CAN-H, CAN-L)) 

    OK: REPLACE D-CAN J/C (JUNCTION CONNECTOR) 

  8. CONNECT CONNECTOR 
    1. Reconnect the P-CAN J/C connector.

    NEXT: GO TO NEXT STEP 

  9. CHECK CAN MAIN WIRE FOR DISCONNECTION (POWER STEERING ECU) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D31 power steering ECU connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      D31-1 (CANH)-D31-7 (CANL) Ignition switch OFF 108 to 132 Ω
      4. Fig 6: Checking CAN Main Wire For Disconnection (Power Steering ECU)
      G04835719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE POWER STEERING ECU 

    NG: GO TO NEXT STEP 

  10. CONNECT CONNECTOR 
    1. Reconnect the power steering ECU connector.

    NEXT: GO TO NEXT STEP 

  11. CHECK CAN MAIN WIRE FOR DISCONNECTION (P-CAN J/C - POWER STEERING ECU) 
    1. Turn the ignition switch OFF.
    2. Disconnect the D42 P-CAN J/C connector.
    3. Measure the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION CONDITION CHART

      Tester Connection Condition Specified Condition
      D42-4(EPS)-D42-15 (EPS) Ignition switch OFF 108 to 132 Ω
      4. Fig 7: Checking Can Main Wire For Disconnection (P-Can J/C - Power Steering ECU)
      G04835720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (P-CAN J/C - POWER STEERING ECU (CAN-H, CAN-L)) 

    OK: REPLACE P-CAN J/C (JUNCTION CONNECTOR) 

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