Aerio L4-2.3L (2006)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
ABS Hydraulic Unit/Control Module Assembly Description
ABS control module is a component of ABS hydraulic unit/control module assembly and has the following functions.
Self-Diagnosis Function
ABS control module diagnoses conditions of the system component parts (whether or not there is any abnormality) all the time and indicates the
results (warning of abnormality occurrence and DTC) through the ABS warning lamp as described.
1. When ignition switch is turned ON, ABS warning lamp lights for 2 seconds to check its bulb and circuit.
2. When no abnormality has been detected (the system is in good condition), ABS warning lamp turns OFF after 2 seconds.
3. When an abnormality in the system is detected, ABS warning lamp lights and the area where that abnormality lies is stored in the memory of
EEPROM in ABS control module.
4. When Diagnostic switch terminal (2) of monitor connector (blue) (1) is grounded, the abnormal area is output as DTC. It is indicated by flashing
of ABS warning lamp.
5. Also ABS control module turns ON EBD warning lamp (brake warning lamp) depending on the trouble and EBD warning lamp does not indicate
DTC.
Fail-Safe Function
When an abnormality occurs (an abnormal DTC is detected), ABS control module turns OFF the fail-safe relay which supplies power to ABS
hydraulic unit. Thus, with ABS not operating, brakes function just like the brake system of the vehicle without ABS.
