|
Electrical check of the ABS and ABS/EDL
Test table
|
|
|---|
|
Switch to measuring range:
Voltage measurement (20 V =)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
1
|
35 + 1
|
Voltage supply (terminal 30) on control unit (J104)
|
▪ Ignition switched off
|
10.0 - 14.5 V
|
- Check wire from contact 1 to earth point2).
|
|
EDL
|
|
|
|
|
- Check wire from contact 35 via fuse S54 to battery +.
|
|
2
|
53 + 1
|
Voltage supply (terminal 15) on control unit (J104)
|
▪ Ignition switched off
|
10.0 - 14.5 V
|
- Check wire from contact 1 to earth point2).
|
|
|
|
|
|
|
- Check wire from contact 53 to contact D/7 (relay plate).
|
1)
=>Page 01-43
, Electrical check
2)
Under rear seat near control unit
|
|
|---|
|
Switch to measuring range:
Voltage measurement (20 V =)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
3
|
33 + 1
|
Function of ABS relay (J102)
|
▪ Ignition switched off
|
|
- Check wire from contact 1 to earth point2).
|
|
|
|
Voltage supply at control unit (J104)
|
- Bridge sockets 19 and 34 on V.A.G 1598
|
|
- Check wire from contact 33 via J102 and S54 to battery +.
|
|
|
|
|
- Switch on ignition: ABS relay (J102) operates
|
10.0 - 14.5 V
|
If J102 does not operate, check activation:
|
|
|
|
|
|
ABS warning lamp (K47) goes out
|
- Check wire from contact 34 to J102/4 and relay J102.
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-43
, Electrical check
2)
Under rear seat near control unit
|
|
|---|
|
Switch to measuring range:
Voltage measurement (20 V =)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
4
|
3 + 1
|
Function of ABS relay (J102)
|
▪ Ignition switched off
|
|
- Check wire from contact 3 via J02 and S54 to battery +.
|
|
|
|
(Reference voltage)
|
- Bridge sockets 19 and 34 on V.A.G 1598
|
|
|
|
|
|
|
- Switch on ignition: J102 operates
|
10.0 - 14.5 V
|
If J102 does not operate, check activation:
|
|
|
|
|
|
ABS warning lamp (K47) goes out
|
- Check wire from contact 34 to J102/4 and relay J102.
|
|
|
|
|
- Remove bridge after the check
|
|
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
Switch to measuring range:
Voltage measurement (20 V =)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
5
|
32 + 1
|
Function of brake light switch (F)
|
▪ Ignition switched off
|
After operating the brake light switch:
|
- Check fuse S16 and brake light switch (F).
Check wire from contact 1 to earth point2).
|
|
|
|
|
- Depress and hold brake pedal
|
10.0 - 14.5 V
|
- Check wire from contact 32 to contact W/4 (relay plate).
|
1)
=>Page 01-43
, Electrical check
2)
Under rear seat near control unit
|
|
|---|
|
Switch to measuring range:
Resistance measurement (2 kω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
6
|
47 + 29
|
Resistance of front right speed sensor
(G45)
|
▪ Ignition switched off
|
1.0 ... 1.3 kω
|
- Check connector T2.
|
|
|
|
|
|
|
- Check resistance of speed sensor (1.0...1.2 kω).
|
|
|
|
|
|
|
- Check wire to speed sensor, move wire while checking (loose contact).
|
|
7
|
48 + 30
|
Resistance of front left speed sensor (G47)
|
▪ Ignition switched off
|
1.0 ... 1.3 kω
|
- Check connector T2
|
|
|
|
|
|
|
- Check resistance of speed sensor (1.0...1.2 kω)
|
|
|
|
|
|
|
- Check wire to speed sensor, move wire while checking (loose contact).
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
Switch to measuring range:
Resistance measurement (2 kω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
8
|
45 + 27
|
Resistance of rear right speed sensor (G44)
|
▪ Ignition switched off
|
1.0 ... 1.3 kω
|
- Check connector T2
|
|
|
|
|
|
|
- Check resistance of speed sensor (1.0...1.2 kω)
|
|
|
|
|
|
|
- Check wire to speed sensor, move wire while checking (loose contact).
|
|
9
|
46 + 28
|
Resistance of rear left speed sensor (G46)
|
▪ Ignition switched off
|
1.0 ... 1.3 kω
|
- Check connector T2
|
|
|
|
|
|
|
- Check resistance of speed sensor (1.0...1.2 kω)
|
|
|
|
|
|
|
- Check wire to speed sensor, move wire while checking (loose contact).
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
Switch to measuring range:
Resistance measurement (2 M ω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
10
|
1 + 29
|
Insulation resistance of screening to front right speed sensor (G45)
|
▪ Ignition switched off
|
min. 2 M ω2)
|
- Check screening for damage (chafing), move wire while checking (loose contact).
|
|
11
|
1 + 30
|
Insulation resistance of screening to front right speed sensor (G47)
|
▪ Ignition switched off
|
min. 2 M ω2)
|
- Check screening for damage (chafing), move wire while checking (loose contact).
|
1)
=>Page 01-43
, Electrical check
2)
If hand multimeter V.A.G 1526 indicates "1.", this signifies infinite resistance and is OK.
|
|
|---|
|
Switch to measuring range:
Resistance measurement (2 M ω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
12
|
1 + 27
|
Insulation resistance of screening to rear right speed sensor (G44)
|
▪ Ignition switched off
|
min. 2 M ω2)
|
- Check screening for damage (chafing), move wire while checking (loose contact).
|
|
13
|
1 + 28
|
Insulation resistance of screening to rear left speed sensor (G46)
|
▪ Ignition switched off
|
min. 2 M ω2)
|
- Check screening for damage (chafing), move wire while checking (loose contact).
|
1)
=>Page 01-43
, Electrical check
2)
If hand multimeter V.A.G 1526 indicates "1.", this signifies infinite resistance and is OK.
|
|
|---|
|
Switch to measuring range:
Resistance measurement (200 ω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
14
|
53 + 34
|
Winding resistance of ABS relay (J102)
|
▪ Ignition switched off
|
50 ...100 ω
|
- Check wire from contact 53 without J102 to contact 34.
|
|
|
|
|
|
|
- Check J102 winding resistance (50...100 ω), renew if necessary.
|
|
15
|
15 + 33
|
Winding resistance of ABS hydraulic pump relay (J185)
|
▪ Ignition switched off
|
50 ... 100 ω
|
- Check wire from contact 33 without J185 to contact 15
|
|
|
|
|
|
|
- Check J185 winding resistance (50...100 ω), renew if necessary.
|
|
16
|
7 + 33
|
Winding resistance of EDL relay (J310)
|
▪ Ignition switched off
|
50 ... 100 ω
|
- Check wire from contact 33 without J185 to contact 7
|
|
EDL
|
|
|
|
|
- Check J310 winding resistance (50 - 100 ω), renew if necessary.
|
1)
=>Page 01-43
, Electrical check
1)
=>Page 01-43
, Electrical check
1)
=>Page 01-43
, Electrical check
1)
=>Page 01-43
, Electrical check
1)
=>Page 01-43
, Electrical check
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
Switch to measuring range:
Resistance measurement (200 ω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
27
|
31+49
|
Resistance of hydraulic pump sender (G101)
|
▪ Ignition switched off
|
29 ... 40 ω
|
- Check wire from contact 49 without G101 to contact 31.
|
|
|
|
|
|
|
- Check resistance of G101 (29...40 ω), if necessary renew ABS hydraulic unit.
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
Switch to measuring range:
Resistance measurement (2 Kω)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
28
|
16+41
|
Resistance of brake pedal position sender (G100)
|
▪ Ignition switched off
|
|
- Check wire from contact 16 without G100 to contact 41.
|
|
|
|
|
G100 is a variable resistance. Depending on pedal position, the following readings are obtained when depressed from the rest position:
|
|
- 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
|
|
|
|
|
-Stage 1
(Rest position)
|
230 ... 270 ω
|
|
|
|
|
|
-Stage 2
|
410 ... 460 ω
|
|
|
|
|
|
-Stage 3
|
540 ... 600 ω
|
|
|
|
|
|
-Stage 4
|
650 ... 730 ω
|
|
|
|
|
|
-Stage 5
|
770 ... 860 ω
|
|
|
|
|
|
-Stage 6
|
980...1100 ω
|
|
|
|
|
|
-Stage 72)
|
|
|
1)
=>Page 01-43
, Electrical check
2)
Stage 7 is only achieved if a fault exists (pressure loss); Specification min. 2Mω
|
|
|---|
|
Switch to measuring range:
Resistance measurement (200 ω also 2 M ωin test step 29)
|
|
Test step1)
|
V.A.G 1598 sockets
|
Item tested
|
▪ Test conditions
- Additional operations
|
Specification
|
Measures for deviations from specification
|
|
29
|
13 + 26
|
Function of ABS pressure control switch (F137)2)
|
▪ Ignition switched off
|
|
- Check wire from contact 13 without F137 to contact 26.
|
|
EDL
|
|
|
▪ Brake pedal not depressed
Select (2 M ω)measuring range on V.A.G 1526
|
min. 1.5 ω
|
- If the specification is not attained, replace ABS/EDL hydraulic unit.
|
|
|
|
|
- Depress brake pedal as far as stop and hold
|
min. 2 M ω
|
|
|
30
|
1 + 3
1 + 33
|
Resistance of ABS relay (J102)
|
▪ Ignition switched off
|
max. 1.5 ω
|
- Check wire from contact 3 and contact 33 without J102 to earth.
|
|
|
1 + 19
|
Resistance of earth connections
|
|
|
- Check wire from contact 1 and contact 19 via earth connections3)to battery -.
|
1)
=>Page 01-43
, Electrical check
2)
The ABS/EDL pressure control switch (F137) is only required for the control unit 1 HO 907 379 A.
3)
Under rear seat near control unit
|
|
|---|
|
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
|
|
31
|
45 + 27
|
Rear right speed sensor (G44) voltage signal
|
▪ Vehicle raised
|
|
- Check connector T2, installation of speed sensor and impulse wheel.
|
|
|
|
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Rotate front right wheel at approx. 1 rev./sec.
|
min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
|
|
32
|
46 + 28
|
Rear left speed sensor (G46) voltage signal
|
▪ Vehicle raised
▪
|
|
- Check connector T2, installation of speed sensor and impulse wheel.
|
|
|
|
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Rotate rear left wheel at approx. 1 rev./sec.
|
min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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
|
|
- Check connector T2, installation of speed sensor and impulse wheel.
|
|
|
|
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Rotate rear right wheel at approx. 1 rev./sec.
|
min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
|
|
34
|
48 + 30
|
Front left speed sensor (G47) voltage signal
|
▪ Vehicle raised
|
|
- Check connector T2, installation of speed sensor and impulse wheel.
|
|
|
|
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Rotate rear left wheel at approx. 1 rev./sec.
|
min. 65 mV alternating voltage
|
- Check whether speed sensor has been interchanged.
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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 -.
|
|
|
|
|
- Switch on ignition for max. 30 sec.
|
ABS hydraulic pump (V64) must run audibly
|
- If no open circuit, replace ABS hydraulic unit.
|
|
|
|
|
- Remove bridge after test
|
|
|
|
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 -.
|
|
EDL
|
|
|
- Switch on ignition for max. 30 sec.
|
ABS hydraulic pump (V64) must run audibly
|
- If no open circuit, replace ABS/EDL hydraulic unit.
|
|
|
|
|
- Remove bridge after test
|
|
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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
|
Function of front left inlet and outlet valve
|
▪ Vehicle raised
|
|
- Check that brake pipes are correctly connected.
|
|
|
19 = 2
|
(N101/N102)
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Front left wheel locks
|
- ABS hydraulic unit defective, replace.
|
|
|
|
|
- Switch on ignition for max. 30 sec.
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Front left wheel must rotate freely; pedal must not give
|
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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.
|
|
|
19 = 38
|
(N99/N100)
|
▪ Ignition switched off
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Front right wheel locks
|
- ABS hydraulic unit defective, replace.
|
|
|
|
|
- Switch on ignition for max. 30 sec.
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Front right wheel must rotate freely; pedal must not give
|
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Rear left wheel locks
|
- ABS hydraulic unit defective, replace
|
|
|
|
|
- Switch on ignition for max. 30 sec.
|
|
|
|
|
|
|
- Depress brake pedal and hold
|
Rear left wheel must rotate freely; pedal must not give
|
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-43
, Electrical check
|
|
|---|
|
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 01-43
, 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 01-43
, 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 T16
|
Connect hand multimeter V.A.G 1526 with aux. cables from adapter set V.A.G 1594 to T2x2) (black):
|
|
- Check wire from T16/4 to earth.
Check wire from T16/16 via S22 to terminal 30.
|
|
|
|
|
contact 4 - earth
|
10.0 - 14.5 V
|
|
|
|
|
|
contact 16 - positive
|
|
|
|
43
|
-
|
Resistance of the K-wire for the self diagnosis, connector T16/7
|
▪ Ignition switched off
Using adapter set V.A.G 1594 connect socket 42 of V.A.G 1598
|
|
- Check wire from T2d/2 to contact 42.
|
|
|
|
|
- and contact 7 of connector T16 to the hand multimeter V.A.G 1526
|
max. 1.5 ω
|
- Check wire from T16/7 via TV14 to contact 42
|
1)
=>Page 01-43
, Electrical check
2)
=>Page 01-48
, 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
|
|
|
|
|
|
- Remove bridge after check
|
|
|
1)
=>Page 01-43
, Electrical check
|
