Brake System

Component Location





General Description

CAN communication is applied just for ESC( Electronic Stability Control) installed in the vehicle for sending requirement data, such as torque reduction, the number of fuel cut cylinders, and TCS control requests, to the Engine ECM & TCU. The Engine ECM performs fuel cut functions according to requests from the ABS ECU and retards ignition timing by torque reduction requests. The TCU maintains current gear positions during ESC control time, by not increasing power which causes a kickdown shift.

DTC Description

The HECU checks the CAN communication lines for normal ESC control, and sets this code if CAN BUS OFF status is detected for more than 100 ms.

DTC Detecting Condition





Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal conditions. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
> Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
NO
> Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Ignition "OFF".
2. Measure resistance between terminal "22" of the HECU harness connector and terminal "7" of the HECU harness connector.

Specification : Approx. 60 Ohms





3. Is the measured resistance within specifications?
YES
> Fault is intermittent caused by open or short in CAN signal harnessor was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
> Check for open or short in CAN signal harness between terminal "22" of the HECU harness connector and terminal "7" of the HECU harness connector. Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Are any DTCs present ?
YES
> Go to the applicable troubleshooting procedure.
NO
> System performing to specification at this time.