B2791

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: B2791: Communication Condition Failure between ECM

DTC B2791 - Communication Condition Failure between ECM

DESCRIPTION

This DTC is output when the ID code box does not respond to a verification request signal from the ECM.
HINT:
- If the engine switch is turned off immediately after the engine starts, DTC B2791 will be detected. If DTC B2791 is cleared, this DTC will not reoccur because it does not indicate a malfunction.
- If this DTC B2791 is detected simultaneously with DTC B2799, troubleshoot B2799 first.





WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE:
If the engine can be started even when DTC B2791 is output, the ID code box can be considered normal. Be sure to recheck for DTCs after clearing the DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

1. CHECK ENGINE START
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check that the engine starts.
Result:





HINT: Perform this step when the engine switch is turned off immediately after the engine starts.

B -- END
A -- Continue to next step.
2. CHECK DTC OUTPUT
(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:





HINT: If the engine does not start, DTC B2791 will not be detected separately from other DTCs because DTC B2791 will be output together with other DTCs. Troubleshoot DTCs other than DTC B2791.

B -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START
A -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS