Main Body ECU Communication Stop Mode

NETWORKING: CAN COMMUNICATION SYSTEM: Main Body ECU Communication Stop Mode
- Main Body ECU Communication Stop Mode

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization

NEXT -- Continue to next step.

2. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

(a) Disconnect the E3 main body ECU (cowl side junction block LH) connector.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (COWL SIDE JUNCTION BLOCK) (CANH, CANL)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization





Text in Illustration





(b) Disconnect the 2A and 2D main body ECU (cowl side junction block LH) connectors.

(c) Disconnect the E3 main body ECU (cowl side junction block LH) connector.

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

Standard Resistance:





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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)