CAN COMMUNICATION SYSTEM Steering Angle Sensor Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Steering Angle Sensor Communication Stop Mode

Either condition is met:


  • "Spiral cable (Steering Angle Sensor)" is not displayed on the "Communication Bus Check" screen of the intelligent tester Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Steering Angle Sensor Communication Stop Mode" in "DTC Combination Table" Click here


  • Steering sensor branch line or connector

  • Power source circuit of steering sensor

  • Steering sensor ground circuit

  • Steering sensor

WIRING DIAGRAM

A01ESR9E24
A01ESR9E12

INSPECTION PROCEDURE

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 negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery 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 ignition switch to ON, wait at least 12 seconds, and then drive the vehicle at a speed of 6 km/h (4 mph) or more for at least 6 seconds. Check that the warning light remains off after turning off following the initial light check.

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

Tech Tips


  • Operating the ignition 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 (STEERING SENSOR BRANCH LINE)


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

    2. A01EX21E54
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

      Disconnect the steering sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I29-3 (CANH) - I29-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (STEERING SENSOR)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01EX21E56
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I29-1 (ESS) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

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

    3. A01EX21E55
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Sensor)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I29-4 (IG) - Body ground Ignition switch ON 11 to 14 V
      I29-5 (BAT) - Body ground Ignition switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE STEERING SENSOR Click here