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Test table > < Electrical check of ABS/EDL/TCS/ESP ITT  MARK 20

A3 Mk1

Connecting test boxV.A.G 1598 A with adapter cable (47-pin)V.A.G 1598/33 to ABS with EDL control unitJ104
Connecting test box -V.A.G 1598 A- with adapter cable (47-pin) -V.A.G 1598/33- to ABS with EDL control unit -J104-
   
–  Switch off ignition.
–  If fitted, remove cover at front left of engine compartment -arrows-.
  A10-1254
–  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 for air mass meter -3-.
–  Unscrew bolts -4- and -5-.
–  Take out air cleaner housing.
  A10-0443
–  Release 47-pin connector at ABS with EDL control unit -J104--arrow 1- and detach -arrow 2-.
  N01-0223
–  Connect test box -V.A.G 1598 A- with adapter cable (47-pin) -V.A.G 1598/33--item 1- to unplugged 47-pin connector -2- of ABS with EDL control unit -J104-.
  Caution
To prevent damage to the electronic components, select respective measuring range and note 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 47-pin connector onto pins of ABS with EDL control unit -J104- and secure connector.
  Note
t  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.
t  The socket designations of the test box -V.A.G 1598 A- are identical to the contact designations of the ABS with EDL control unit -J104- in the current flow diagram.
t  Incorrect test procedures can cause system damage. Do not make bridging connections between any contacts other than those listed in the test table.
t  The specified values are valid for an ambient temperature between 0 ... 40 °C.
t  If measured values differ from specifications, locate fault according to current flow diagram.
t  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.
t  Before renewing components, check wiring and connections. Repeat resistance check on the component, particularly where specifications call for a resistance of less than 10Ω.
  N01-0226
47-pin connector of ABS with EDL control unit -J104- / sockets on test box -V.A.G 1598 A-
  N01-0225
1 -Brake detection switch, ESP -F83-25 -Lateral acceleration sender -G200-
2 -Earth terminal 3126 -Brake pressure sender 2 -G214-
3 -Speed sensor, front right -G45-“–”27 -Yaw rate sender -G202-
4 -Speed sensor, front right -G45-“+”28 -Brake pressure sender 1 -G201-
5 -Vacant29 -Brake detection switch, ESP -F83-
6 -Speed sensor, rear right -G44-“+”30 -Longitudinal acceleration sender -G251- → Note
7 -Speed sensor, rear right -G44-“–”31 -Brake light suppression relay, ESP -J508-
8 -Coding bridge to contact 18 → Note32 -Brake detection switch, ESP -F83-
9 -Lateral acceleration sender -G200-33 -Speed sensor, front left -G47-“–”
10 -Brake pressure sender 2 -G214-34 -Speed sensor, front left -G47-“+”
11 -Yaw rate sender -G202-35 -Vacant
12 -Brake pressure sender 1 -G201-36 -Speed sensor, rear left -G46-“+”
13 -Brake detection switch, ESP -F83-37 -Speed sensor, rear left -G46-“–”
14 -Longitudinal acceleration sender -G251- → Note38 -Coding bridge to contact 18 → Note
15 -Earth point in engine compartment (left-side)39 -Diagnosis K-wire
16 -Battery “+” via fuse40 -Lateral acceleration sender -G200-
17 -Brake detection switch, ESP -F83-41 -Brake pressure sender 2 -G214-
18 -Coding bridge to contact 8 → Note or contact 38 → Note42 -Yaw rate sender -G202-
19 -CAN bus High43 -Brake pressure sender 1 -G201-
20 -CAN bus Low44 -Power supply, terminal 75a in dash panel wiring harness (via fuse)
21 -Vacant45 -Longitudinal acceleration sender -G251- → Note
22 -ABS warning lamp -K47-46 -Earth point in engine compartment (left-side)
23 -Brake light switch -F-47 -Battery “+” via fuse
24 -Traction control system switch -E132-  

1)  Only applies to vehicles with four-wheel drive.
2)  Front wheel drive vehicles only.
   

Test table > < Electrical check of ABS/EDL/TCS/ESP ITT  MARK 20