B2799

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2799: Engine Immobiliser System Malfunction

DTC B2799 - Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output when one of the following occurs: 1) the ECM detects errors in its own communications with the immobiliser code ECU; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the immobiliser code ECU and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no certification ECU DTCs are present. If present, troubleshoot the certification ECU DTCs first.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- If the transponder key ECU assembly is replaced, register the key and ECU communication ID.
- If the ECM is replaced, register the ECU communication ID.

PROCEDURE

1. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
DTC B2799 output does not reoccur.
NG -- ECU COMMUNICATION ID REGISTRATION
OK -- USE SIMULATION METHOD TO CHECK
2. ECU COMMUNICATION ID REGISTRATION
(a) Re-register the ECU communication ID between the transponder key ECU assembly and ECM.
NEXT -- Continue to next step.

3. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
DTC B2799 output does not reoccur.
NG -- CHECK CONNECTION OF CONNECTOR
OK -- END
4. CHECK CONNECTION OF CONNECTOR
(a) Turn the ignition switch off.
(b) Check that the connectors are properly connected to the ECM and the transponder key ECU.
OK:
Connectors are properly connected.
NG -- CONNECTING CONNECTORS PROPERLY
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)




(a) Disconnect the T10 ECU connector.
(b) Disconnect the E7 or E14 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





- *1: for 1GR-FE
- *2: for 2TR-FE
(d) Reconnect the ECU connector.
(e) Reconnect the amplifier connector.
MG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. REPLACE ECM
(a) Replace the ECM.

- for 1GR-FE Removal.
- for 2TR-FE Removal.

NEXT -- Continue to next step.

7. ECU COMMUNICATION ID REGISTRATION
(a) Re-register the ECU communication ID between the transponder key ECU assembly and ECM.
NEXT -- Continue to next step.

8. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
DTC B2799 output does not reoccur.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END