sensor AUDI A4 1998 B5 / 1.G Brakes ABS EDL ASR Bosch 5.3 Workshop Manual

01-122

ABS/EDL
-K47- Brake
system ASR

-
K86-
1) Reasons why the indicator lamps light up










X










X1) For all vehicles:
For vehicles with control modules that do not provide EBD emergency mode:
If activation of both the ABS warning light -K47- and traction control indicator light -K86- is
OK and the voltage supply is OK, the warning lamps light up for 2 seconds during the self-
test after ignition is switched on.
Check the voltage supply for the red "brake system malfunction" symbol. Carry out
"Electrical test" step 9, page 01
-166
. If the control is malfunctioning, see the next
example for lighted indicator lights.
For DTCs stored in DTC memory that are no longer detected during the self-test when
ignition is switched on or when a specific vehicle speed is reached and are found to be OK
when checked, the red "brake system malfunction" symbol does not light up. For
example:If there was a dynamic malfunction of the wheel speed sensor during the last
driving period, the warning lamps automatically switch off after vehicle is restarted if wheel
speed sensor is tested as OK once a vehicle speed of 2.75 km/h is reached.
- These vehicles can be identified by checking the note column under "Check control module
version"; page 01
-128
.
Voltage supply for the ABS control module -J104- is between 7 and 10 volts and the
vehicle speed is 12 km/h. If the vehicle speed exceeds 6 km/h, a DTC entry will be
made in DTC memory. At a vehicle speed of > 12 km/h, the red "brake system
malfunction" symbol lights up; "Check DTC memory" page 01
-187

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