CAN COMMUNICATION SYSTEM 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 CAN Bus Check screen of the Techstream Click here

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


  • Tire pressure warning ECU and receiver branch line or connector

  • Power source circuit of tire pressure warning ECU and receiver

  • Tire pressure warning ECU and receiver ground circuit

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

A01I365E07

INSPECTION PROCEDURE

Note


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

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary terminal notices before proceeding with work Click here.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG), wait at least 60 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

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

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 LINES (TIRE PRESSURE WARNING ECU AND RECEIVER BRANCH LINE)


    1. Disconnect the cable from the negative (-) auxiliary terminal.

    2. A01I4AME34
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the O33 tire pressure warning ECU and receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O33-9 (CANH) - O33-10 (CANL) Cable disconnected from negative (-) auxiliary terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01I4AME35
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O33-12 (GND) - Body ground Cable disconnected from negative (-) auxiliary terminal Below 1 Ω

    2. Reconnect the cable to the negative (-) auxiliary terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O33-1 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here