B2785

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B2785: Communication Malfunction between ECUs Connected by LIN
B2785 - Communication Malfunction between ECUs Connected by LIN

DESCRIPTION

This DTC is output when LIN communication from the certification ECU stops for a certain amount of time.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* If the certification ECU or ID code box is replaced, register the key and ECU communication ID Engine Immobiliser System (W/ Smart Key System).
* If the steering lock ECU or main body ECU is replaced, register the ECU code and ECU communication ID Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

1. CHECK DTC OUTPUT

(a) Delete the DTCs Engine Immobiliser System (w/ Smart Key System).

(b) Recheck for DTCs Engine Immobiliser System (w/ Smart Key System).

Result:





B -- END
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE)

(a) Disconnect the E58, E51, IR and E50 ECU connectors.





(b) 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.

3. CHECK CERTIFICATION ECU

(a) After replacing the certification ECU with a normal one, check for DTCs Engine Immobiliser System (w/ Smart Key System).

Result:





B -- END
A -- Continue to next step.

4. CHECK MAIN BODY ECU

(a) After replacing the main body ECU with a normal one, check for DTCs Engine Immobiliser System (w/ Smart Key System).

Result:





B -- END
A -- Continue to next step.

5. CHECK STEERING LOCK ECU

(a) After replacing the steering lock ECU with a normal one, check for DTCs Engine Immobiliser System (w/ Smart Key System).

Result:





B -- END

A -- REPLACE ID CODE BOX