Cee´d(ED) > 2010 > G 2.
0 DOHC > Brake > Electronic Stability Program > C2372
Electronic Shuttle Valve Primary (HSV1) Error
C2372 Electronic Shuttle Valve Primary (HSV1) Error > General Information
Component Location
General Description
The HECU is composed of a ECU (Electronic Control Unit ) and an HCU(Hydraulic Control Unit), so the HECU hardware includes
all solenoid valves inside the unit as well as the ECU.
Solenoid valves are switched to ON, OFF by HECU when the ABS is activated. Solenoid valves function is to increase, decrease or
maintain the hydralic pressure supplied to a wheel cylinder.
DTC Description
The HECU monitors the operation of the valves by checking the drive circuit of the solenid valves, and then sets this code when the
unexpcted drive voltage is detected.
For example, the HECU sets the DTC if the electrical feedback signal does not match the actuation signal for the corresconding
valve.
DTC Detecting Condition
Item Detecting Condition Possible Cause
DTC Strategy • Voltage monitoring
Monitoring • Once after ignition on at standstill if the BLS is off.
Period • At vehicle speed ≥ 15 km/h if the BLS is on.
Case1 • The test actuates all valves in series to detect shorts or
Enable
shunts between the valve lines. Faults are detected if there
Conditions
is an error during the test.
• The drift test executes only once during an ignition Cycle.
The test is triggered if the following conditions are fulfilled :
10min after power up or end of control
Monitoring 1. No BLS is applied
• Faulty HECU
Period 2. Brake pressure is < 10bar
Case2 3. Vehicle speed >15km/h
4. Vehicle acceleration > 0.5m/s2
5. Supply voltage > 11 volts.
• The drift test is executed only once during an ignition Cycle.
Enable
If it detects partly shorted valve coils,almost defective coils
Conditions
or malfunction of the valve driver, a failure is reconized.
• Valve cannot be actuated or valve is incorrectly actuated.
Fail-Safe This may result in locked wheels or wheels without pressure.
• ABS/EBD/ESP function is prohibited.
• ABS/EBD/ESP warning lamp is turned ON.
C2372 Electronic Shuttle Valve Primary (HSV1) Error > Scantool Diagnostics > Monitor Actuation
Test
Monitor Actuation Test
1. Connect scantool to Data Link Connector(DLC)
2. Ignition "ON" & Engine "OFF".
3. Select the "Actuation Test" mode on the scantool.
4. Inspect opearating status of ESP(HSV) valve #1 with Actuation Test.
Specification : It’s normal if operating sound is heard.
Fig.1) Test Condition : Ignition "ON" & Engine "OFF".
Ex) Actuation Test on ESP(HSV) valve #1
5. Does a ESP(HSV) valve #1 operate normally?
▶ Fault is intermittent caused by poor connection in power harness and/or HECU's connector or was
repaired and HECU memory was not cleared. Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination, deterioration, or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Terminal and Connector Inspection" procedure.
C2372 Electronic Shuttle Valve Primary (HSV1) Error > Inspection/Repair > W/Harness Inspection
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition.
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?
▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ 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.
C2372 Electronic Shuttle Valve Primary (HSV1) Error > Verification of Vehicle Repair
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. (Start and drive vehicle in gear and maintain vehicle
speed at or above 15km/h. (9mph)
4. Are any DTCs present ?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
