B1207

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: B1207: Certification ECU Communication Malfunction
B1207 - Certification ECU Communication Malfunction

DESCRIPTION

The main body ECU will store this DTC when no signals can be received from the certification ECU while the CAN MS main bus is normal.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Turn the engine switch off before measuring the resistance of CAN bus main wires and CAN bus branch wires.
* After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT
Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

PROCEDURE

1. CHECK DTC

(a) Check for DTCs.

HINT
If CAN MS bus communication error DTC B2326 is output, troubleshoot for B2326 and check for malfunctions in the CAN MS main bus circuit B2326.

Result:





B -- GO TO DTC CHART CAN Communication System
A -- Continue to next step.

2. CHECK CAN MS BUS WIRE (CERTIFICATION ECU)

(a) Turn the engine switch off.





(b) Disconnect connector E13 from the certification ECU.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CERTIFICATION ECU)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (IG, E)

(a) Measure the resistance according to the value(s) in the table below.





Standard resistance:





(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE CERTIFICATION ECU