C2320
DTC C2312 FL OUTLET VALVE MALFUNCTIONDTC C2320 FR OUTLET VALVE MALFUNCTION
DTC C2328 RL OUTLET VALVE MALFUNCTION
DTC C2336 RR OUTLET VALVE MALFUNCTION
COMPONENT LOCATION:
GENERAL DESCRIPTION
The HECU is composed of an 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 hydraulic pressure supplied to a brake caliper.
DTC DESCRIPTION
The HECU monitors the operation of the valves by checking the drive circuit of the solenoid valves, and then sets this code when the unexpected drive voltage is detected. For example, the HECU sets the DTC if the electrical feedback signal does not match the actuation signal for the corresponding valve.
DTC DETECTING CONDITION:
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 operating status of inlet valve with Actuation Test.
5. Does a inlet valve operate normally?
YES
> Fault is intermittent caused by inoperative valve or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
> Go to "Component Inspection" procedure.
COMPONENT INSPECTION
1. Ignition "OFF".
2. Engine "ON".
3. Start and drive vehicle in gear and maintain vehicle speed at or above 15 km/h (9 mph).
4. Does warning lamp remain On?
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 inoperative 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.