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.
* Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
* After the ignition 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 ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

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

PROCEDURE

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

(a) Turn the ignition switch off.





(b) Disconnect the D42 main body ECU connector.

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

Standard Resistance:





Text in Illustration





(d) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (IG SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Enter the following menus: Body / Main Body / Data List / IG SW Scan Tool Testing and Procedures.

(d) Read the value displayed on the Techstream.

Body / Main Body / Data List





OK:

Ignition switch condition is displayed correctly.

NG -- CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK POWER SOURCE)

OK -- REPLACE MAIN BODY ECU Removal

3. CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK POWER SOURCE)





Text in Illustration





(a) Disconnect the 3D instrument panel junction block assembly connector.

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

Standard Resistance:





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

Standard Voltage:





(d) Reconnect the instrument panel junction block assembly connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE MAIN BODY ECU

(a) Replace the main body ECU with a new or normal one Removal.

OK:

The vehicle is returned to its normal condition and operates normally.

NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- END