B2799
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2799: Engine Immobiliser System Malfunction
B2799 - Engine Immobiliser System Malfunction
DESCRIPTION
This DTC is output when one of the following occurs: 1) the ECM detected errors in its own communications with the transponder key ECU; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no transponder key ECU DTCs are present. If present, troubleshoot the transponder key ECU DTCs first.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC OUTPUT
(a) Delete the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
DTC B2799 output does not reoccur.
NG -- ECU CODE REGISTRATION
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
2. ECU CODE REGISTRATION
(a) Re-register the ECU communication ID between the transponder key ECU and ECM Programming and Relearning.
NEXT -- Continue to next step.
3. CHECK DTC OUTPUT
(a) Delete 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 -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
(a) Disconnect the E79 ECU and E77 ECM connectors.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. REPLACE ECM
(a) Replace the ECM Removal.
NEXT -- Continue to next step.
7. ECU CODE REGISTRATION
(a) Re-register the ECU communication ID between the transponder key ECU assembly and ECM Programming and Relearning.
NEXT -- Continue to next step.
8. CHECK DTC OUTPUT
(a) Delete the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTC.
OK:
DTC B2799 output does not reoccur.
NG -- REPLACE TRANSPONDER KEY ECU Removal
OK -- END (ECM IS DEFECTIVE)