414 / 948
Anti-lock Braking System(ABS)
22
WARNING :
Foot pressure on the pedal, using master
cylinder only, will not achieve the same degree of
braking as is available from power assistance.
ii. Insufficient fluid in TMC
If there is insufficient fluid in master cylinder to
create pressure, braking to all four wheels is
retained and ABS remains operative. The red
warning light
(fluid level indicator lamp)
will be
illuminated if the level in fluid reservoir is low
(due
to leakage of fluid)
enough to actuate fluid level
switch.
WARNING :
Longer pedal travel is required, but power
assisted braking is available at reduced efficiency.
B. TABLE OF ABS 9.1 - FALL-BACK LEVEL
ABS
FALLBAC
K LEVEL
ABS Warning
Lamp
Brake Lamp
Status
System
System
active
Lamp
System
active
Lamp
System
active with
limitation
YES
OFF
NO
ON
System
active
YES
OFF
YES
OFF
Emergency
- EBD
NO
ON
YES
OFF
System
passive
NO
ON
NO
ON
NOTE :
For brake bleeding procedure conventional/ using
diagnostic tool refer Brakes group.
3.
ABS DIAGNOSTIC USER MANUAL :
A. GENERAL :
The Diagnostic Tester software for ABS is
capable to communicate with ECU in the vehicle
through OBD CAN interface. The tester comprises
of an Interface Unit and custom built application
software. The user friendly application software
can be easily installed on Windows Desktop or
Laptop.
The interface unit is lightweight and compact in
size to facilitate easy portability. It works on
vehicle battery supply.
The tester application executes all the commands
supported by ABS ECU, which helps in diagnosis
of ABS ECU.
Following service are provided by the Diagnostic
Tester application:
ECU Identification Data
ECU Parameter
Dynamic Information
Read & Clear DTC
IO Control
Repair Bleed
NOTE :
For fault code details and troubleshooting refer
Book 3 (A3 Book).