ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2272

DTC Code DTC Name
B2272 Ignition 1 Monitor Malfunction

DESCRIPTION

This DTC is output when there is a problem in the IG1 output circuit, which is from the inside of the power source control ECU to the RH-IG or LH-IG relay.

Tech Tips

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No. DTC Detection Condition Trouble Area
B2272 IG1 relay actuation circuit inside power source control ECU or other related circuit is malfunctioning

  • Main body ECU RH (cowl side junction block RH)

  • Main body ECU LH (cowl side junction block LH)

  • Power source control ECU

  • Wire harness or connector

WIRING DIAGRAM

A01614NE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the intelligent tester main switch on.

    3. Select the item below in the Data List, and read the display on the intelligent tester.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the intelligent tester and vehicle starts.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG1 Relay Monitor (Outside) Status of IG1 relay monitor (outer) / ON or OFF

      ON: Engine switch on (IG) (IG1 relay is ON)

      OFF: Engine switch off (IG1 relay is OFF)

      		 -
      OK
      "ON" (engine switch on (IG)) appears on the screen.

    NG

    CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) Click here

    OK

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch on (IG).

    3. Depress the brake pedal.

    4. After 10 seconds have elapsed, check if the trouble occurs again.

    5. Check for DTC again.

      OK
      DTC B2282 is not output.

    NG

    REPLACE POWER SOURCE CONTROL ECU

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)


    1. A0161SWE10

      Disconnect the RD and RA connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RD-6 - RA-5 or RD-7 Always 68 to 175 Ω
      RD-6 - RD-12 Always Below 1 Ω
      RD-6 - Body ground Always 10 kΩ or higher
      RA-5 or RD-7 - Body ground Always Below 1 Ω

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

  4. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)


    1. A0162M4E09

      Disconnect the LD connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LD-13 - LD-8 or LD-9 Always 68 to 250 Ω at 20°C (68°F)
      LD-13 - Body ground Always 10 kΩ or higher

    NG

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - COWL SIDE JUNCTION BLOCK RH)


    1. A015YOZE12

      Disconnect the J55 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J55-34 (IG1D) - RD-6 Always Below 1 Ω
      J55-34 (IG1D) or RD-6 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - COWL SIDE JUNCTION BLOCK RH)

    OK

  6. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - COWL SIDE JUNCTION BLOCK LH)


    1. A015Z4EE04

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      RD-12 - LD-13 Always Below 1 Ω
      RD-12 or LD-13 - Body ground Always 10 kΩ or higher
      LD-9 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COWL SIDE JUNCTION BLOCK RH - COWL SIDE JUNCTION BLOCK LH)

    OK

    REPLACE POWER SOURCE CONTROL ECU