B2786
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2785, B2786, B2789: Communication Malfunction between ECUs Connected by LIN
B2789 - No Response from ID BOX
DESCRIPTION
This DTC is output when LIN communication from the certification ECU stops for a certain amount of time.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (LIN COMMUNICATION LINE AND BODY GROUND)
(a) Disconnect the P33, J29, J55 and J69 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.
2. CHECK DTC OUTPUT
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE ID CODE BOX
C -- REPLACE CERTIFICATION ECU
A -- Continue to next step.
3. REPLACE STEERING LOCK ECU
(a) Replace the steering lock ECU.
NEXT -- Continue to next step.
4. ECU CODE REGISTRATION
(a) Register the ECU communication ID between the ECUs connected by LIN communication Engine Immobilizer System.
NEXT -- Continue to next step.
5. CHECK DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE CERTIFICATION ECU
6. REPLACE ID CODE BOX
NEXT -- Continue to next step.
7. ELECTRICAL KEY REGISTRATION
(a) Register the electrical key code in the certification ECU Engine Immobilizer System.
NEXT -- Continue to next step.
8. ECU COMMUNICATION ID REGISTRATION
(a) Register the ECU communication ID between the ID code box and ECM Engine Immobilizer System.
NEXT -- Continue to next step.
9. CHECK DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE CERTIFICATION ECU
10. REPLACE CERTIFICATION ECU
(a) Replace the certification ECU.
NEXT -- Continue to next step.
11. ELECTRICAL KEY REGISTRATION
(a) Register the electrical key code in the certification ECU Engine Immobilizer System.
NEXT -- Continue to next step.
12. ECU COMMUNICATION ID REGISTRATION
Register the ECU communication ID between the ID code box and ECM Engine Immobilizer System.
NEXT -- Continue to next step.
13. CHECK DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- Continue to next step.
14. REPLACE POWER SOURCE CONTROL ECU
(a) Replace the power source control ECU.
NEXT -- Continue to next step.
15. ECU CODE REGISTRATION
(a) Register the ECU communication ID between the ECUs connected by LIN communication Engine Immobilizer System.
NEXT -- Continue to next step.
16. CHECK DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- Continue to next step.
17. REPLACE STEERING LOCK ECU
(a) Replace the steering lock ECU.
NEXT -- Continue to next step.
18. ECU CODE REGISTRATION
(a) Register the ECU communication ID between the ECUs connected by LIN communication Engine Immobilizer System.
NEXT -- Continue to next step.
19. CHECK DTC OUTPUT
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- REPLACE ID CODE BOX