Electrical check of the ABS and ABS/EDL ITT Mark 04
Fault table
Notes on test table
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◆ The socket designations of the test box V.A.G 1598 are identical to the contact designations on the control unit (J104).
=> Current flow diagrams, Electrical fault finding and Fitting locations.
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◆ If the readings obtained deviate from the specifications, carry out fault rectification measure in the right-hand part of the table.
=> Current flow diagrams, Electrical fault finding and Fitting locations.
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◆ If the measured figures only deviate slightly from the specifications, clean sockets and plugs of the testers and adapter cables (with contact spray G 000 700 04 ) and repeat check. Before replacing components, check wiring and connections and also, particularly for specifications of less than 10 ω, repeat resistance check on the component.
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Switch to measuring range:
Voltage measurement (20 V =)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
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Specification
|
Measures for deviations from specification
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1
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35 + 1
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Voltage supply (terminal 30) on control unit (J104)
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▪ Ignition switched off
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10.0 - 14.5 V
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- Check wire from contact 1 to earth point2).
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EDL
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- Check wire from contact 35 via fuse S54 to battery +.
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2
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53 + 1
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Voltage supply (terminal 15) on control unit (J104)
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▪ Ignition switched off
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10.0 - 14.5 V
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- Check wire from contact 1 to earth point2).
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- Check wire from contact 53 to contact D/5 (relay plate) also fuse S4.
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1)
=>Page 01-49
, Electrical check
2)
Up to 01.93 under right sill panel trim; from 01.93 under rear seat near control unit
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Switch to measuring range:
Voltage measurement (20 V =)
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Test step1)
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V.A.G 1598 sockets
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Item tested
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▪ Test conditions
- Additional operations
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Specification
|
Measures for deviations from specification
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3
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33 + 1
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Function of ABS relay (J102)
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▪ Ignition switched off
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- Check wire from contact 1 to earth point2).
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Voltage supply at control unit (J104)
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- Bridge sockets 19 and 34 on V.A.G 1598
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- Check wire from contact 33 via J102 and S54 to battery +.
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- Switch on ignition: ABS relay (J102) operates
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10.0 - 14.5 V
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If J102 does not operate, check activation:
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ABS warning lamp (K47) goes out
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- Check wire from contact 34 to J102/4 and relay J102.
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- Remove bridge after check
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1)
=>Page 01-49
, Electrical check
2)
Up to 01.93 under right sill panel trim; from 01.93 under rear seat near control unit
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Switch to measuring range:
Voltage measurement (20 V =)
|
Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
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Specification
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Measures for deviations from specification
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4
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3 + 1
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Function of ABS relay (J102)
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▪ Ignition switched off
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- Check wire from contact 3 via J02 and S54 to battery +.
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(Reference voltage)
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- Bridge sockets 19 and 34 on V.A.G 1598
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- Switch on ignition: J102 operates
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10.0 - 14.5 V
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If J102 does not operate, check activation:
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ABS warning lamp (K47) goes out
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- Check wire from contact 34 to J102/4 and relay J102.
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- Remove bridge after the check
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1)
=>Page 01-49
, Electrical check
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Switch to measuring range:
Voltage measurement (20 V =)
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Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
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5
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32 + 1
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Function of brake light switch (F)
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▪ Ignition switched off
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After operating the brake light switch:
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- Check fuse S20 and brake light switch (F).
Check wire from contact 1 to earth point2).
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- Depress and hold brake pedal
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10.0 - 14.5 V
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- Check wire from contact 32 to contact W/4 (relay plate).
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1)
=>Page 01-49
, Electrical check
2)
Up to 01.93 under right sill panel trim; from 01.93 under rear seat near control unit
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Switch to measuring range:
Resistance measurement (2 kω)
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Test step1)
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V.A.G 1598 sockets
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Item tested
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▪ Test conditions
- Additional operations
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Specification
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Measures for deviations from specification
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6
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47 + 29
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Resistance of front right speed sensor
(G45)
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▪ Ignition switched off
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1.0 ... 1.3 kω
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- Check connector T2.
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- Check resistance of speed sensor (1.0...1.3 kω).
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- Check wire to speed sensor, move wire while checking (loose contact).
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7
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48 + 30
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Resistance of front left speed sensor (G47)
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▪ Ignition switched off
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1.0 ... 1.3 kω
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- Check connector T2
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- Check resistance of speed sensor (1.0...1.3 kω)
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- Check wire to speed sensor, move wire while checking (loose contact).
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1)
=>Page 01-49
, Electrical check
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Switch to measuring range:
Resistance measurement (2 kω)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
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8
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45 + 27
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Resistance of rear right speed sensor (G44)
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▪ Ignition switched off
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1.0 ... 1.3 kω
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- Check connector T2
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- Check resistance of speed sensor (1.0...1.3 kω)
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- Check wire to speed sensor, move wire while checking (loose contact).
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9
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46 + 28
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Resistance of rear left speed sensor (G46)
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▪ Ignition switched off
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1.0 ... 1.3 kω
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- Check connector T2
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- Check resistance of speed sensor (1.0...1.3 kω)
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- Check wire to speed sensor, move wire while checking (loose contact).
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1)
=>Page 01-49
, Electrical check
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Switch to measuring range:
Resistance measurement (2 M ω)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
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10
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1 + 29
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Insulation resistance of screening to front right speed sensor (G45)
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▪ Ignition switched off
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min. 2 M ω2)
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- Check screening for damage (chafing), move wire while checking (loose contact).
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11
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1 + 30
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Insulation resistance of screening to front right speed sensor (G47)
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▪ Ignition switched off
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min. 2 M ω2)
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- Check screening for damage (chafing), move wire while checking (loose contact).
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1)
=>Page 01-49
, Electrical check
2)
If hand multimeter V.A.G 1526 indicates "1.", this signifies infinite resistance and is OK.
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Switch to measuring range:
Resistance measurement (2 M ω)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
12
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1 + 27
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Insulation resistance of screening to rear right speed sensor (G44)
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▪ Ignition switched off
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min. 2 M ω2)
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- Check screening for damage (chafing), move wire while checking (loose contact).
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13
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1 + 28
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Insulation resistance of screening to rear left speed sensor (G46)
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▪ Ignition switched off
|
min. 2 M ω2)
|
- Check screening for damage (chafing), move wire while checking (loose contact).
|
1)
=>Page 01-49
, Electrical check
2)
If hand multimeter V.A.G 1526 indicates "1.", this signifies infinite resistance and is OK.
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Switch to measuring range:
Resistance measurement (200 ω)
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Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
14
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53 + 34
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Winding resistance of ABS relay (J102)
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▪ Ignition switched off
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50 ...100 ω
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- Check wire from contact 53 without J102 to contact 34.
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- Check J102 winding resistance (50...100 ω), renew if necessary.
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15
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15 + 33
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Winding resistance of ABS hydraulic pump relay (J185)
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▪ Ignition switched off
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50 ... 100 ω
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- Check wire from contact 33 without J185 to contact 15
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- Check J185 winding resistance (50...100 ω), renew if necessary.
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16
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7 + 33
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Winding resistance of EDL relay (J310)
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▪ Ignition switched off
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50 ... 100 ω
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- Check wire from contact 33 without J185 to contact 7
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EDL
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- Check J310 winding resistance (50 - 100 ω), renew if necessary.
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1)
=>Page 01-49
, Electrical check
1)
=>Page 01-49
, Electrical check
1)
=>Page 01-49
, Electrical check
1)
=>Page 01-49
, Electrical check
1)
=>Page 01-49
, Electrical check
1)
=>Page 01-49
, Electrical check
|
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Switch to measuring range:
Resistance measurement (200 ω)
|
Test step1)
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V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
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27
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31+49
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Resistance of hydraulic pump sender (G101)
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▪ Ignition switched off
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29 ... 40 ω
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- Check wire from contact 49 without G101 to contact 31.
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- Check resistance of G101 (29...40 ω), if necessary renew ABS hydraulic unit.
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Switch to measuring range:
Resistance measurement (2 Kω)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
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▪ Test conditions
- Additional operations
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Specification
|
Measures for deviations from specification
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28
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16+41
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Resistance of brake pedal position sender (G100)
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▪ Ignition switched off
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- Check wire from contact 16 without G100 to contact 41.
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G100 is a variable resistance. Depending on pedal position, the following readings are obtained when depressed from the rest position:
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- Check resistance of G100 (with adapter cable V.A.G 1594/23) according to specification for switching stages, if defective, replace brake pedal position sender.
=> Running gear; Repair gr. 45
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-Stage 1
(Rest position)
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230 ... 270 ω
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-Stage 2
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410 ... 460 ω
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-Stage 3
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540 ... 600 ω
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-Stage 4
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650 ... 730 ω
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-Stage 5
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770 ... 860 ω
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-Stage 6
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980...1100 ω
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-Stage 72)
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1)
=>Page 01-49
, Electrical check
2)
Stage 7 is only achieved if a fault exists (pressure loss); Specification min. 2Mω
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Switch to measuring range:
Resistance measurement (200 ω also 2 M ωin test step 29)
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Test step1)
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V.A.G 1598 sockets
|
Item tested
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▪ Test conditions
- Additional operations
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Specification
|
Measures for deviations from specification
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29
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13 + 26
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Function of ABS pressure control switch (F137)3)
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▪ Ignition switched off
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- Check wire from contact 13 without F137 to contact 26.
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EDL
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▪ Brake pedal not depressed
Select (2 M ω)measuring range on V.A.G 1526
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min. 1.5 ω
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- If the specification is not attained, replace ABS/EDL hydraulic unit.
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- Depress brake pedal as far as stop and hold
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min. 2 M ω
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30
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1 + 3
1 + 33
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Resistance of ABS relay (J102)
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▪ Ignition switched off
|
max. 1.5 ω
|
- Check wire from contact 3 and contact 33 without J102 to earth.
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1 + 19
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Resistance of earth connections
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- Check wire from contact 1 and contact 19 via earth connections2)to battery -.
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1)
=>Page 01-49
, Electrical check
2)
Up to 01.93 under right sill panel trim; from 01.93 under rear seat near control unit
3)
Is only required for control unit 1H0 907 379A/B/C
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Switch to measuring range:
Voltage measurement (2 V font=symbol charset=fontspecific code=64 descr='[ap]')
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Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
31
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45 + 27
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Rear right speed sensor (G44) voltage signal
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▪ Vehicle raised
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- Check connector T2, installation of speed sensor and impulse wheel.
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▪ Ignition switched off
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- Rotate front right wheel at approx. 1 rev./sec.
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min. 65 mV alternating voltage
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- Check whether speed sensor has been interchanged.
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32
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46 + 28
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Rear left speed sensor (G46) voltage signal
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▪ Vehicle raised
▪
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- Check connector T2, installation of speed sensor and impulse wheel.
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▪ Ignition switched off
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- Rotate rear left wheel at approx. 1 rev./sec.
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min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
|
1)
=>Page 01-49
, Electrical check
|
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Switch to measuring range:
Voltage measurement (2 V font=symbol charset=fontspecific code=64 descr='[ap]')
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
33
|
47 + 29
|
Front right speed sensor (G45) voltage signal
|
▪ Vehicle raised
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- Check connector T2, installation of speed sensor and impulse wheel.
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▪ Ignition switched off
|
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- Rotate rear right wheel at approx. 1 rev./sec.
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min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
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34
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48 + 30
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Front left speed sensor (G47) voltage signal
|
▪ Vehicle raised
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- Check connector T2, installation of speed sensor and impulse wheel.
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▪ Ignition switched off
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- Rotate rear left wheel at approx. 1 rev./sec.
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min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
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1)
=>Page 01-49
, Electrical check
|
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Functional check: Hydraulic pump (V64)
Attention: On no account must the brake pedal be depressed during this check !
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
35
|
Bridge
19 = 34
19 = 15
|
Function of ABS hydraulic pump (V64)
|
▪ Ignition switched off
|
After switching on the ignition:
|
- Check wire from battery + via fuse S53, J185 and V64 to battery -.
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- Switch on ignition for max. 30 sec.
|
ABS hydraulic pump (V64) must run audibly
|
- If no open circuit, replace ABS hydraulic unit.
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- Remove bridge after test
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36
|
Bridge
19 = 34
19 = 7
|
EDL function of ABS hydraulic pump (V64)
|
▪ Ignition switched off
|
After switching on the ignition:
|
- Check wire from battery + via fuse S53, J310, N159 and V64 to battery -.
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EDL
|
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- Switch on ignition for max. 30 sec.
|
ABS hydraulic pump (V64) must run audibly
|
- If no open circuit, replace ABS/EDL hydraulic unit.
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- Remove bridge after test
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1)
=>Page 01-49
, Electrical check
|
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Functional check: Front left inlet and outlet valve (N101/N102)
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
37
|
Bridge
19 = 34
19 = 20
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Function of front left inlet and outlet valve
|
▪ Vehicle raised
|
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- Check that brake pipes are correctly connected.
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19 = 2
|
(N101/N102)
|
▪ Ignition switched off
|
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- Depress brake pedal and hold
|
Front left wheel locks
|
- ABS hydraulic unit defective, replace.
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- Switch on ignition for max. 30 sec.
|
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- Depress brake pedal and hold
|
Front left wheel must rotate freely; pedal must not give
|
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- Remove bridge after check
|
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|
1)
=>Page 01-49
, Electrical check
|
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Functional check: Front right inlet and outlet valve (N99/N100)
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
38
|
Bridge
19 = 34
19 = 21
|
Function of front left inlet and outlet valve
|
▪ Vehicle raised
|
|
- Check that brake pipes are correctly connected.
|
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19 = 38
|
(N99/N100)
|
▪ Ignition switched off
|
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|
|
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- Depress brake pedal and hold
|
Front right wheel locks
|
- ABS hydraulic unit defective, replace.
|
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- Switch on ignition for max. 30 sec.
|
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- Depress brake pedal and hold
|
Front right wheel must rotate freely; pedal must not give
|
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- Remove bridge after check
|
|
|
1)
=>Page 01-49
, Electrical check
|
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Functional check: Inlet and outlet valve (N134/N136)
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
39
|
Bridge
19 = 34
19 = 36
|
Function of rear left inlet and outlet valve
|
▪ Vehicle raised
|
|
- Check that brake pipes are correctly connected.
|
|
19 = 54
|
(N134/N136)
|
▪ Ignition switched off
|
|
|
|
|
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- Depress brake pedal and hold
|
Rear left wheel locks
|
- ABS hydraulic unit defective, replace
|
|
|
|
- Switch on ignition for max. 30 sec.
|
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|
|
|
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- Depress brake pedal and hold
|
Rear left wheel must rotate freely; pedal must not give
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-49
, Electrical check
|
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Functional check: Inlet and outlet valve (N133/N135)
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
40
|
Bridge
19 = 55
19 = 34
|
Function of rear right inlet and outlet valve
|
▪ Vehicle raised
|
|
- Check that brake pipes are correctly connected.
|
|
19 = 18
|
(N133/N135)
|
▪ Ignition switched off
|
|
|
|
|
|
- Operate brake pedal and hold
|
Rear right wheel locks
|
- ABS hydraulic unit defective, replace.
|
|
|
|
- Switch on ignition for max. 30 sec.
|
|
|
|
|
|
- Operate brake pedal and hold
|
Rear right wheel must rotate freely; pedal must not give
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-49
, Electrical check
|
---|
Functional check: Differential lock valves 1 + 2 (N125/N126 )
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
41
|
Bridge
1 = 7
1 = 34
1 = 40
1 = 37
|
Functional check of differential lock valves 1 + 2 (N125 + N126)
|
▪ Vehicle raised
|
|
- ABS/EDL hydraulic unit defective, replace.
|
EDL
|
|
|
- Switch on ignition for max. 30 sec.
|
It must not be possible to turn front wheels
|
|
|
|
|
Remove bridge after check
|
|
|
1)
=>Page 01-49
, Electrical check
|
---|
Switch to measuring range:
Voltage measurement (20 V =) in test step 42, Resistance measurement (200ω)in test step 43
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
42
|
-
|
Voltage supply for V.A.G 1551, connector T2x
|
Connect hand multimeter V.A.G 1526 with aux. cables from adapter set V.A.G 1594 to T2x2) (black):
|
|
- Check wire from T2x/1 to earth.
Check wire from T2x/2 via S22 to terminal 30.
|
|
|
|
contact 1 - earth
|
10.0 - 14.5 V
|
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|
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|
contact 2 - positive
|
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|
43
|
-
|
Resistance of the K-wire for the self diagnosis, connector T2z/2
|
▪ Ignition switched off
Using adapter set V.A.G 1594 connect socket 42 of V.A.G 1598
|
|
- Check wire from T2z/2 to contact 42.
|
|
|
|
- and contact 2 of connector T2z2) (white) to the hand multimeter V.A.G 1526
|
max. 1.5 ω
|
|
1)
=>Page 01-49
, Electrical check
2)
=>Page 01-55
, contact assignment of connectors for voltage supply and self-diagnosis with the fault reader V.A.G 1551
|
---|
Functional check: ABS warning lamp (K47)
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
44
|
-
|
Function of ABS warning lamp (K47)
|
▪ Ignition switched off
|
|
- Check wire from contact W/2 (relay plate) via relay J102 (diode) to earth.
|
|
|
|
- Switch on ignition
|
Warning lamp (K47) lights up
|
- Check wire from contact X/8 (relay plate) via K47 to contact X/4 (relay plate), K47
(12 V, 1,2 W) renew if necessary.
|
|
|
|
- Bridge sockets 1 and 34 on V.A.G 1598:
|
Warning lamp (K47) goes out
|
- Check wire from contact 52 to contact W/2 (relay plate).
|
|
|
|
J102 operates
|
|
|
|
|
|
- Bridge sockets 1 and 52 on V.A.G 1598
|
Warning lamp (K47) lights up
|
|
|
|
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- Remove bridge after check
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1)
=>Page 01-49
, Electrical check
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---|
Switch to measuring range:
Voltage measurement (20 V =) in test step 42, Resistance measurement (200ω)in test step 43
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Test step1)
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V.A.G 1598 sockets
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Item tested
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▪ Test conditions
- Additional operations
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Specification
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Measures for deviations from specification
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45
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-
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Voltage supply for V.A.G 1551, connector T16
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Connect hand multimeter V.A.G 1526 with aux. cables from adapter set V.A.G 1594 to T162) (black):
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- Check wire from T16/4 to earth.
Check wire from T16/16 via S22 to terminal 30.
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contact 4 - earth
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10.0 - 14.5 V
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contact 16 - positive
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46
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-
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Resistance of the K-wire for the self diagnosis, connector T16/7
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▪ Ignition switched off
Using adapter set V.A.G 1594 connect socket 42 of V.A.G 1598
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- Check wire from T2d/2 to contact 42.
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- and contact 7 of connector T16 to the hand multimeter V.A.G 1526
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max. 1.5 ω
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- Check wire from T16/7 via TV14 to contact 42
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1)
=>Page 01-49
, Electrical check
2)
=>Page 01-55
, contact assignment of connectors for voltage supply and self-diagnosis with the fault reader V.A.G 1551
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