CAN COMMUNICATION SYSTEM(for LHD without Central Gateway ECU) Tire Pressure Monitor ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Tire Pressure Monitor ECU Communication Stop Mode

Either Condition is met:


  • "Tire Pressure" is not displayed on the "Bus Check" screen Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Tire Pressure Monitor ECU Communication Stop Mode" in "DTC Combination Table" Click here


  • Tire pressure warning ECU CAN branch wire or connector

  • Power source circuit of tire pressure warning ECU

  • Tire pressure warning ECU ground circuit

  • Tire pressure warning ECU

WIRING DIAGRAM

B001X1GE04
B001ZU1E28
w/ Front Antenna
*a No. 1 CAN Junction Connector
*b ECU-IG NO.2
*c from IG1 NO.1 Relay
*d Tire Pressure Warning ECU

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


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

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (TIRE PRESSURE WARNING ECU CAN BRANCH WIRE)


    1. B001YGPE01
      Text in Illustration
      *A w/o Front Antenna
      *B w/ Front Antenna
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the tire pressure warning ECU connector.

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

      Standard Resistance
      w/o Front Antenna:
      Tester Connection Condition Specified Condition
      L65-9 (CANH) - L65-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      w/ Front Antenna:
      Tester Connection Condition Specified Condition
      L75-9 (CANH) - L75-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO TIRE PRESSURE WARNING ECU (CANH, CANL)

    OK

  2. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND)


    1. B001Y6XE01
      Text in Illustration
      *A w/o Front Antenna
      *B w/ Front Antenna
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU)

      Connect the cable to the negative (-) battery terminal.

      Note

      When connecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      w/o Front Antenna:
      Tester Connection Condition Specified Condition
      L65-7 (+B) - Body ground Always 11 to 14 V
      L65-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      w/ Front Antenna:
      Tester Connection Switch Condition Specified Condition
      L75-1 (IG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      w/o Front Antenna:
      Tester Connection Condition Specified Condition
      L65-12 (GND) - Body ground Always Below 1 Ω
      w/ Front Antenna:
      Tester Connection Condition Specified Condition
      L75-12 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE TIRE PRESSURE WARNING ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR