automatic transmission AUDI A4 2000 B5 / 1.G Brakes ESP Electrical Testing Workshop Manual

01-302

Test requirements

The "Automatic Test Sequence" was carried
out and it was determined that the
Transmission Control Module (TCM) and
Engine Control Module (ECM) only contain
DTCs relating to ABS.

- Connect the VAG1551 Scan Tool (ST) and
select the address word 00 with ignition
switched on;

- After completing electrical test, check and
erase DTC memories of Transmission Control
Module (TCM) and Engine Control Module
(ECM).

Multi-pin harness connector for ABS control module -J104- in proper
condition, with no bent, broken or corroded terminals. Replace any
damaged terminals using VAS1978 wiring repair kit.
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01-303

Note:
The operation manual for the VAS1978 wiring
harness repair kit generally forbids the repair of
any lines in the ABS or related systems. This rule
only pertains to the shielded lines in these
systems.

Ignition and electrical consumers switched
off before beginning testing (headlights,
lighting, fan, etc.).
For steps 13 through 16, raise the vehicle
until the wheels rotate freely. On vehicles
with manual transmission put the gear shift
lever in neutral. On vehicles with automatic
transmission move the selector lever to
position "N".
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01-323
Electrical test; steps 13-27

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
13
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N101
and front left
brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 5 +
28
- Depress brake pedal
and hold.
Left front
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians.
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01-325

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
14
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N99-
and front right
brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 26 +
28
- Depress brake pedal
and hold.
Right front
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians. 2) Vehicles with control module 4B0 907 389
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01-327

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
15
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -
N134- and rear
left brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 53 +
28
- Depress brake pedal
and hold.
Left rear
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians. 2) Vehicles with control module 4B0 907 389
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01-329

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
16
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -
N133- and rear
right brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 6 +
28
- Depress brake pedal
and hold.
Right rear
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians. 2) Vehicles with control module 4B0 907 389
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01-335
Continuation: Function test: Red brake warning symbol
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
18 - Function of red
"brake system
malfunction"
symbol
- Connect VAG1551 scan tool
and select address word 03
- For vehicles with automatic
transmission and instrument
cluster with DIS, depress the
brake pedal and select a
driving gear. The ABS/EDL indicator lamp
and the red "brake system
malfunction" symbol light up.
If the traction control indicator
light is OK, it lights up as
well. Repair Manual,
Electrical Equipment, Repair Group 90; Instrument cluster
- Malfunction in
instrument cluster
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