ENGINE IMMOBILISER SYSTEM(w/ Entry and Start System), Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the ID code box; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box and ECM is different and an engine start is attempted.

Before troubleshooting for this DTC, make sure no certification ECU DTCs are output. If output, troubleshoot the certification ECU DTCs first.

DTC Code

DTC Detection Condition

Trouble Area

B2799

One of the following conditions is met:

  • An error in the communication between the ECM and the ID code box.

  • An error in the communication lines.

  • The communication ID is different during communication with the ID code box.

  • Harness or connector

  • ECM

  • ID code box

WIRING DIAGRAM

B225299E14

CAUTION / NOTICE / HINT

Note:

  • When the ID code box is replaced, reregister the recognition codes and ECU communication ID.

  • for 1WW:

    After turning the engine switch off, make sure to wait at least 6 minutes before disconnecting the ECM connector or replacing the ECM.

PROCEDURE

  1. CHECK CONNECTION OF CONNECTOR

    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and ID code box.

      OK

      Connectors are properly connected.

    CONNECT CONNECTORS PROPERLY

  2. CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

    1. U184678E02

      Disconnect the H111 box connector.

      Table 1. Text in Illustration

      *1

      for ZR Series Engine

      *2

      for 1WW Engine

      *3

      Front view of wire harness connector

      (to ID Code Box)

      *4

      Front view of wire harness connector

      (to ECM)

    2. Disconnect the A76 ECM connector.

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

      Standard Resistance

      for ZR Series Engine

      Tester Connection

      Condition

      Specified Condition

      H111-5 (EFII) - A76-45 (IMO)

      Always

      Below 1 Ω

      H111-6 (EFIO) - A76-28 (IMI)

      H111-5 (EFII) or A76-45 (IMO) - Body ground

      Always

      10 kΩ or higher

      H111-6 (EFIO) or A76-28 (IMI) - Body ground

      for 1WW Engine

      Tester Connection

      Condition

      Specified Condition

      H111-5 (EFII) - A76-44 (IMO)

      Always

      Below 1 Ω

      H111-6 (EFIO) - A76-34 (IMI)

      H111-5 (EFII) or A76-44 (IMO) - Body ground

      Always

      10 kΩ or higher

      H111-6 (EFIO) or A76-34 (IMI) - Body ground

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. REGISTER RECOGNITION CODES

    1. Register the recognition codes in the ECUs.

  4. REGISTER ECU COMMUNICATION ID

    1. Register the ECU communication ID.

  5. CLEAR DTC

    1. Clear the DTCs (Click here).

  6. CHECK FOR DTC

    1. Check for DTCs (Click here).

      OK

      DTC B2799 is not output.

    END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY)

  7. REPLACE ECM

    1. for 1ZR-FAE:

      1. Temporarily replace the ECM with a new or normally functioning one (Click here).

    2. for 2ZR-FAE:

      1. Temporarily replace the ECM with a new or normally functioning one (Click here).

    3. for 1WW:

      1. Temporarily replace the ECM with a new or normally functioning one (Click here).

  8. CLEAR DTC

    1. Clear the DTCs (Click here).

  9. CHECK FOR DTC

    1. Check for DTCs (Click here).

      OK

      DTC B2799 is not output.

    END (ECM IS DEFECTIVE)

    REPLACE ID CODE BOX