C1702

C1702

Component Location:

General Description
There is no hardware difference of the HECU according to the vehicle's specification, just software is changed by the vehicle parameter used for ESC control. The HECU stores a classified variant code value according to the received data (a kind of engine, engine displacement, a kind of T/M). After then the HECU reads various parameters according to the stored variant value in the memory to use for the ESC control.

DTC Description
The HECU checks the variant code after ignition. If a inappropriate variant code is detected or there is no variant code, a fault is detected.

DTC Detecting Condition:

Monitor Scantool Data

Variant Code
1. Check for improper installation of EMS/TCU/ESC.
2. Connect scantool to Data Link Connector (DLC).
3. Ignition "ON".
4. Perform variant code. (figure 1).
5. Disconnect scantool.
6. Ignition "OFF" and then ignition "ON". Go to "Component Inspection"Procedure.






Component Inspection
1. Ignition "OFF".
2. Ignition "ON".
3. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode
4. Using a scantool, Clear DTC.
5. Select "Diagnostic Trouble Codes (DTCs)" mode again.
6. Are any DTCs present?

YES - Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.

NO - Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared. 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.