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Electrical check of the ABS and ABS/ EDL ITT Mark 20 GI
Test table
Notes on test table
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◆ The socket designations of the test box V.A.G 1598 are identical to the control unit (J104) contact designations in current flow diagram.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder.
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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 binder.
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◆ Continuity checks with adapter set V.A.G 1594 (bridging).
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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 step
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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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1
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8 + 25
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Voltage supply for pump motor (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 8 to earth.
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- Check wire from contact 25 via fuse S 123 to battery +.
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2
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9 + 24
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Voltage supply for the valves (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 24 to earth.
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- Check wire from contact 9 via fuse S 124 to battery +.
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Switch to measuring range:
Voltage measurement (20 V =)
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Test step
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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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3
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8 + 23
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Voltage supply (terminal X) on control unit
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▪ Ignition switched on
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10.0 - 14.5 V
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- Check fuse S4
Check wire from contact 8 to earth
Check wire from contact 23 to contact D/3 (relay plate)
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4
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8 + 12
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Function of brake light switch (F)
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▪ Ignition switched off
Brake pedal not depressed
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0.0 - 0.5 V
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- Check fuse S20 and brake light switch (F).
Check wire from contact 8 to earth.
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- Depress brake pedal
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10.0 - 14.5 V
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- Check wire from contact 12 to contact W/4 (relay plate).
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Switch to measuring range:
Resistance measurement (2 kω)
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Test step
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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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5
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3 + 18
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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 T2d.
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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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6
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4 + 11
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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 T2f
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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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Switch to measuring range:
Resistance measurement (2 kω)
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Test step
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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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7
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1 + 17
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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 T2c
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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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8
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2 + 10
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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 T2e
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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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Switch to measuring range:
Voltage measurement (2 V font=symbol charset=fontspecific code=64 descr='[ap]')
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Test step
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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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9
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3 + 18
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Front right speed sensor (G45) voltage signal
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▪ Vehicle raised
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- Check 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
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- Check whether speed sensor has been interchanged.=>Read measured value block 01-126
, display group number 1
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10
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4 + 11
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Front left speed sensor (G47) voltage signal
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▪ Vehicle raised
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- Check installation of speed sensor and impulse wheel.
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▪ Ignition switched off
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- Rotate front left 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.=>Read measured value block 01-126
, display group number 1
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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 step
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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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11
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1 + 17
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Rear right speed sensor (G44) voltage signal
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▪ Vehicle raised
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- Check 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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190 mV ... 1140 mV
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- Check whether speed sensor has been interchanged. =>Read measured value block 01-126
, display group number 1
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12
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2 + 10
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Rear left speed sensor (G46) voltage signal
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▪ Vehicle raised
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- Check installation of speed sensor and impulse wheel.
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▪ Ignition switched off
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- Rotate front left wheel at approx. 1 rev./sec.
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190 mV ... 1140 mV
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- Check whether speed sensor has been interchanged. =>Read measured value block 01-126
, display group number 1
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Switch to measuring range:
Resistance measurement (200 ω)
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Test step
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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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13 a
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15 + 21
(only for vehicles with code 03604)
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Coding bridge
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▪ Ignition switched off
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0.0 -1.0 ω
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- Check wire and contacts in connector
Replace if deviates from specifications
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13 b
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22 + 7
(only for vehicles with code 03704)
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Coding bridge
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▪ Ignition switched off
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0.0 -1.0 ω
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- Check wire and contacts in connector
Replace if deviates from specifications
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Switch to measuring range:
Voltage measurement (20 V =) in test step 14, Resistance measurement (200ω)in test step 15
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Test step
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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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14
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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 T161) (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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15
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Resistance of the K-wire for the self diagnosis, connector T16
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▪ Ignition switched off
Using adapter set V.A.G 1594 connect socket 6 of V.A.G 1598
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- Check wire from TV 14 to contact 13.
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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 13
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1)
=>Page 01-162
, contact assignment of connectors for voltage supply and self-diagnosis with the fault reader V.A.G 1551
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Functional check: ABS warning lamp (K47)
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Test step
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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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16
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Function of ABS warning lamp
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▪ Ignition switched off
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- Check wire from contact W/2 (relay plate) to earth.
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- Switch on ignition
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Warning lamp (K47) lights up
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- Check wire from contact X/8 (relay plate) via K47 to contact X/3 (relay plate), K47
(12 V; 1.2 W) renew if necessary.
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- Check wire from contact 16 to contact W/2 (relay plate).
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Functional check: Brake system warning lamp (K118)
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Test step
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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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17
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Function of brake system warning lamp
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▪ Ignition switched off
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- Check wire from contact U2/10 (replay plate) to earth.
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- Switch on ignition
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Warning lamp (K118) lights up
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- Check wire from contact U2/10 (relay plate) via K47 to contact W/2.
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- Check wire from contact 16 to contact W/2 (relay plate).
Check wire from contact U2/10 to contact 28/18 (dash panel insert connector).
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