CAN COMMUNICATION SYSTEM Power Steering ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Power Steering ECU Communication Stop Mode

  • "EPS" is not displayed on the "Communication Bus Check" screen of the intelligent tester

  • Applies to "Power Steering ECU Communication Stop Mode" in the "DTC COMBINATION TABLE"

  • Power source circuit of the power steering ECU

  • Power steering ECU branch line or connector

  • Power steering ECU

Tech Tips

"EPS" refers to the circuit that includes the power steering ECU.

WIRING DIAGRAM

A0162A1E08
A0162A1E09

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistance of CAN bus main wires and CAN bus branch wires.

  • After the engine 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 engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips

Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.

PROCEDURE


  1. CHECK OPEN IN CAN BUS WIRE (POWER STEERING ECU BRANCH LINE)


    1. Turn the engine switch off.

    2. Disconnect the power steering ECU connector (A31).

    3. A015ZXLE07

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

      Standard Resistance
      Tester Connection Switch Condition Specified Value
      A31-2 (CANH) - A31-3 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE POWER STEERING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  2. CHECK WIRE HARNESS (IG, PGND)


    1. A015ZXLE08

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

      Standard Resistance
      Tester Connection Condition Specified Value
      A31-5 (PGND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Value
      A31-9 (IG) - Body ground Engine switch on (IG) 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU Click here