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 an ECM message is not received within 500ms. The HECU does not detect this code until 2 seconds after the IG KEY is turned to ON.

DTC Detecting Condition





Component Inspection

1. Ignition "OFF".
2. Ignition "ON"
3. Does warning lamp remain On?
YES
> Substitute with a known-good ECM and check for proper operation. If problem is corrected, replace ECM and then go to "Verification Of Vehicle Repair" procedure. If NG, replace HECU and then go to "Verification Of Vehicle Repair" procedure.
NO
> Fault is intermittent caused by faulty ECM and/or faulty HECU or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting 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.