Santa Fe L4-2.4L (2001)
Brake Fluid Pump: Technical Service Bulletins
Brakes - ABS Pump Self-Check Noise Explanation
Group:
CHASSIS
Number:
06-50-003
Date:
MARCH, 2006
Model:
1999 TO CURRENT AZERA, SANTA FE, TUCSON AND SONATA
Subject:
ABS PUMP SELF-CHECK NOISE
DESCRIPTION:
The Anti-lock Brake System (ABS) performs a hydraulic pump self-check test during the first acceleration after each ignition switch cycle. During this
test, the ABS control module tests the pump modulator valves, solenoids and motor operation. This test occurs at a vehicle speed between 0 and 8 mph.
During this test, a noise (customers may describe a rattle, groan, growl or gurgling) may be heard and felt through the brake pedal. This momentary noise
is only heard during the initial period of vehicle motion. If any faults are found, the system disables the anti-lock braking function and will illuminate the
warning lamp and set a diagnostic trouble code.
The purpose of this bulletin is to emphasize that this noise is the result of a normal function self-check test and it cannot be eliminated by replacing the
Hydraulic Electronic Control Unit (HECU).
NOTE:
The HECU interactive pump self-diagnostic test and the related pump activation noise does not affect the ABS operation.
