Connecting adapter V.A.G 1598/21 (test box) to ABS with EDL control unit J104 — AUDI

Connecting
adapter
V.A.G 1598/21
(test box) to
ABS with EDL control unit
J104
Switch off ignition.
If fitted, remove cover at front left of engine compartment
arrows
.
If fitted, disconnect air intake hose for secondary air pump
1
from air cleaner housing.
Detach air intake hose
2
at air mass meter.
Unplug electrical connector at air mass meter
3
.
Unscrew bolts
4
and
5
.
Take out air cleaner housing.
Release 25-pin connector at
ABS with EDL control unit
J104
arrow 1
and detach
arrow 2
.
Connect
adapter
V.A.G 1598/21
(test box)
item 1
to unplugged 25-pin connector
2
of
ABS with EDL control unit
J104
.
Caution
To prevent damage to the electronic components, select the respective measuring range and note the test requirements prior to connecting test leads.
Perform all steps listed for
“fault rectification if reading does not match specification”
.
Only carry out the test steps recommended in the fault table (to trace a specific fault).
After performing electrical check, plug 25-pin connector onto pins of
ABS with EDL control unit
J104
and secure connector.
Note
Use
hand-held multimeter
V.A.G 1526 B
with test leads from
V.A.G 1594 C
or
vehicle diagnostic, testing and information system
VAS 5051 A
with
test leads
VAS 5051 A/7
for the electrical check.
The socket designations of the
adapter
V.A.G 1598/21
(test box) are identical to the contact designations of the
ABS with EDL control unit
J104
in the current flow diagram.
Incorrect test procedures can cause system damage. Do not make bridging connections between any contacts other than those listed in the test table.
The specified values are valid for an ambient temperature between 0 ... 40 °C.
If measured values differ from specifications, locate fault according to current flow diagram.
If the measured values only differ slightly from the specifications, clean the sockets and plugs of the testers and test leads (with
contact spray
G 000 700 04
) and repeat the check.
Before renewing components, check wiring and connections. Repeat resistance check on the component, particularly where specifications call for a resistance of less than 10Ω.
25-pin connector of
ABS with EDL control unit
J104
/ sockets on
adapter
V.A.G 1598/21
(test box)
1 -
Speed sensor, front left
G47
“+”
15 -
Vehicles with TCS:
Traction control system switch
E132
and
traction control system warning lamp
K86
2 -
Speed sensor, front left
G47
“–”
Vehicles with four-wheel drive:
Longitudinal acceleration sender
G251
3 -
Coding bridge to contact 14
16 -
ABS warning lamp
K47
4 -
Power supply, terminal 75/75a in dash panel wiring harness (via fuse)
17 -
Vehicles with four-wheel drive:
Longitudinal acceleration sender
G251
5 -
Speed sensor, rear left
G46
“+”
18 -
Brake light switch
F
6 -
Speed sensor, rear left
G46
“–”
19 -
Speed sensor, front right
G45
“+”
7 -
Diagnosis K-wire
20 -
Speed sensor, front right
G45
“–”
8 -
Earth point in wiring harness of engine compartment
21 -
Vehicles with navigation system:
navigation system with CD drive control unit
J401
9 -
Battery
“+”
via fuse
22 -
Speed sensor, rear right
G44
“–”
10 -
From model year 1998 onwards: CAN bus Low
23 -
Speed sensor, rear right
G44
“+”
11 -
From model year 1998 onwards: CAN bus High
24 -
Earth terminal 31
12 -
Vehicles with navigation system:
navigation system with CD drive control unit
J401
25 -
Battery
“+”
(
ABS hydraulic pump
V64
via fuse)
13 -
Vehicles with four-wheel drive:
Longitudinal acceleration sender
G251
14 -
Coding bridge to contact 3