Dtc B1207 Certification Ecu Communication Malfunction

Communication System. Camry. Acv40 Gsv40
Can Communication. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK FOR OPEN IN CAN MS BUS MAIN WIRE (CERTIFICATION ECU MAIN WIRE)

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

DTC 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.

DTC No.
DTC Detection Condition
Trouble Area
B1207
No communication from certification ECU
  1. Certification ECU branch wire or connector
  2. Certification ECU power source circuit
  3. Certification ECU

WIRING DIAGRAM


Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd). Dtc B1207 Certification Ecu Communication Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and lighting system are not operating.
  3. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition 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 ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
1.CHECK DTC

  1. 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 (CAMRY_ACV40 RM000002DX8020X.html).
    Result:
    Result
    		Proceed to
    B2326 is not output
    		A
    B2326 is output
    		B


B
GO TO DTC CHART
A


2.CHECK FOR OPEN IN CAN MS BUS MAIN WIRE (CERTIFICATION ECU MAIN WIRE)

  1. Turn the ignition switch off.



    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd). Dtc B1207 Certification Ecu Communication Malfunction

  1. Disconnect connector E74 from the certification ECU.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E74-27 (CANH) - E74-28 (CANL)
    		Ignition switch off
    		108 to 132 Ω


NG
REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    Camry. Acv40 Gsv40.Can Communication.Can Communication System (For Lhd). Dtc B1207 Certification Ecu Communication Malfunction

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Value
    E74-17 (E) - Body ground
    		Always
    		Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Value
    E74-18 (IG) - Body ground
    		Ignition switch ON
    		10 to 14 V
    E74-1 (+B) - Body ground
    		Always
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CERTIFICATION ECU