ECM Communication Stop Mode

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: ECM Communication Stop Mode
- ECM Communication Stop Mode

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
* Turn the ignition switch off before inspecting CAN bus wires for a ground short.
* After the ignition switch is turned off, check that the key reminder warning system is 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 any doors need to be opened in order to check connectors, open the doors and leave them open.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1. PRECAUTION

NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Service Precautions.

NEXT -- Continue to next step.

2. 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.

NEXT -- Continue to next step.

3. SYSTEM CHECK

(a) Check the vehicle specifications.

Result

B -- CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN WIRE)
A -- Continue to next step.

4. CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN WIRE)

(a) Turn the ignition switch off.

(b) Disconnect the E14 ECM connector.

Text in Illustration

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

5. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)

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

(b) Disconnect the E11 and E13 ECM connectors.

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

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

6. CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN WIRE)

(a) Turn the ignition switch off.

(b) Disconnect the E7 ECM connector.

Text in Illustration

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

7. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)

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

(b) Disconnect the E4 and E8 ECM connectors.

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

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal