C2380 ABS/TCS/ESC(ESP) valve error - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The ABS 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 an unexpected high drive voltage is detected when the valve relay is switched to OFF. (or unexpected low voltage is detected when the solenoid valve drive TR is switched to ON)

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Internal monitoring

Faulty HECU

Enable Conditions

If the valve relay is switched ON and corresponding solenoid driver OFF and the voltage of solenoid < 3.5±0.5V continuously for 56ms, the failure is detected.

If the valve relay is switched ON and corresponding solenoid driver ON and the voltage of solenoid > 1.5±0.5V continuously for 56ms, the failure is detected.

Fail Safe

The ABS/EBD/ESP functions are inhibited.

The ABS/EBD/ESP warning lamps are activated.

DIAGNOSTIC CIRCUIT DIAGRAM

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.

Has a problem been found?

	▶ Repair as necessary .
	▶ Go to “Component Inspection” Procedure.

COMPONENT INSPECTION

1.	Ignition “OFF” & Engine “OFF”.

2.	Ignition “ON” & Engine “OFF”.

3.	Connect scantool and select “Diagnostic Trouble Codes(DTCs)” mode.

4.	Using a scantool, Clear DTC.

5.	Select “Diagnostic Trouble Codes(DTCs)” mode again.

Are any DTCs present ?

	▶ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU
	▶ Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared.

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