MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1210

DTC Code DTC Name
B1210 Power ECU Stop

DESCRIPTION

Tech Tips

This DTC is only output on vehicles equipped with an entry and start system.


DTC No. DTC Detection Condition Trouble Area
B1210 Power source control ECU communication stops

  • Power source control ECU

  • Wire harness or connector

WIRING DIAGRAM

A0162XIE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (AM2)


    1. Remove the AM2 fuse from the main body ECU RH (cowl side junction block RH).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AM2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    1. A0160C6E23

      Disconnect the J55 ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J55-33 (AM1) - Body ground Always 11 to 14 V
      J55-12 (AM2) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR


    1. A016154E09

      Disconnect the J55, J26 and 2F connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J55-7 (MPX1) - J26-7 (MPX2) Always Below 1 Ω
      J55-24 (MPX2) - 2F-5 (MPX1) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMMUNICATION LINE)

    OK

    REPLACE POWER SOURCE CONTROL ECU