C2308
DTC C2308 FL INLET VALVE MALFUNCTIONDTC C2316 FR INLET VALVE MALFUNCTION
DTC C2324 RL INLET VALVE MALFUNCTION
DTC C2332 RR INLET VALVE MALFUNCTION
COMPONENT LOCATION
Refer to DTC C1235. C1235
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 scan tool to Data Link Connector (DLC)
2. Ignition "ON" & Engine "OFF".
3. Select the "Actuation Test" mode on the scan tool.
4. Inspect operating status of inlet valve with Actuation Test.
5. Does a inlet valve operate normally?
YES
>Fault is intermittent caused by faulty valve or was repaired and HECU memory was not cleared. Go to "Verification Of Vehicle Repair" procedure.
No
>Go to "W/Harness Inspection" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals, 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?
YES
>Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
No
>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.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a scan tool, 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 30 kmh (18.6 mph).
4. Are any DTCs present?
YES
>Go to the applicable troubleshooting procedure.
No
>System performing to specification at this time.