Slabs Ecu Self-Diagnostics

While ignition is on, diagnostics function of Self Leveling and Anti-Lock Brake System Electronic Control Unit (SLABS ECU) monitors system for faults. Return pump is tested by briefly pulsing it immediately after engine starts if vehicle speed was more than 5 MPH during previous ignition cycle. If a fault exists in a warning light circuit, the light will not illuminate during bulb check when ignition is turned on. But if there are no faults, systems will remain fully functional. If a fault is detected during power up, SLABS ECU stores a fault code in memory and illuminates appropriate warning lights. If fault is detected after power up, SLABS ECU will also sound chime 3 times.