B1207

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1207: Certification ECU Communication Malfunction

DTC B1207 - Certification ECU Communication Malfunction

DESCRIPTION
- This DTC is detected when communication between the certification ECU and network gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY AND BODY GROUND)





(a) Disconnect the U28 ECU connector.
(b) Measure the resistance and voltage of the wire harness side connector.
Standard resistance:
Standard voltage










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK RESISTANCE OF COMMUNICATION LINE





(a) Disconnect the K66, M4 and U28 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE CERTIFICATION ECU AND WIRE HARNESS OR CONNECTOR
A -- REPLACE CERTIFICATION ECU