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Electrical check of ABS ITT Mark 04 GI
Test table
Notes on test table
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◆ The socket designations of adapter V.A.G 1598/21 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 hydraulic pump -V64- to 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 using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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2
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9 + 24
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Voltage supply for the valves in hydraulic unit -N55- to 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 using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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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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22 + 24
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Voltage supply (terminal X) to control unit -J104
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▪ Ignition switched on
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10.0 - 14.5 V
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- Check wire using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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4
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10 + 24
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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 brake light switch -F- and read measured value block,
, display group 003
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- Depress brake pedal
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approx. battery voltage
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- Adjusting brake light switch
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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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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1 + 17
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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 wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Wiggle wiring during test
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If no fault can be located in the wiring:
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- Renew speed sensor -G45
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=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles
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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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6
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3 + 18
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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 wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Wiggle wiring during test
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If no fault can be located in the wiring:
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- Renew speed sensor -G47
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=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles
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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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5 + 13
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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 wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Wiggle wiring during test
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If no fault can be located in the wiring:
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- Renew speed sensor -G44
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=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles
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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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8
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14 + 21
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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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- Separate connector on speed sensor -G46
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Wiggle wiring during test
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If no fault can be located in the wiring:
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- Renew speed sensor -G46
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=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles
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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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1 + 17
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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 -G45- and rotor.
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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 -G45- has been interchanged andread measured value block
, display group number 001
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10
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3 + 18
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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 -G47- and rotor.
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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 -G47- has been interchanged andread measured value block
, display group number 001
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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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5 + 13
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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 -G44- and rotor.
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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. 190 mV alternating voltage
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- Check whether speed sensor -G44- has been interchanged andread measured value block
, display group number 001
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12
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14 + 21
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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 -G46- and rotor.
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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. 190 mV alternating voltage
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- Check whether speed sensor -G46- has been interchanged andread measured value block
, display group number 001
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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
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2 + 12
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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 wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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|---|
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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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14
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-
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Supply voltage for V.A.G 1551, connector T161)
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▪ Ignition switched off
Connect hand multimeter V.A.G 1526 using adapter set V.A.G 1594 to connector T161)
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10.0 -14.5 V
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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1)
Diagnosis connection contact assignment
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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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15
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Resistance of K wire for V.A.G 1551 connector T161)
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▪ Ignition switched off
Disconnect multi-pin connector from control unit -J104
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max. 1.5 ω
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Connect test box V.A.G 1598/21
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- Connect multimeter V.A.G 1526 to contacts T16/71) and T25/6 of multi-pin connectors from control unit -J104- using adapter set V.A.G 1594
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1)
Diagnosis connection contact assignment
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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 -K47
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▪ Switch ignition on
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Warning lamp -K47- lights up for approx. 2 seconds and goes out again
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Fault in dash panel insert
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=> General body repairs, interior; Repair group 70; Dash panel
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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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-
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Function of brake system warning lamp -K118
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▪ Handbrake not applied
▪ Brake fluid level is OK.
▪ Switch ignition on
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Warning lamp -K118- does not light up
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- Apply handbrake
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Warning lamp -K118- lights up
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- Check wiring using current flow diagram
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=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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- Fault in dash panel insert
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=> General body repairs, interior; Repair group 70; Dash panel
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Functional check: Hydraulic pump -V64
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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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18
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Function of ABS hydraulic pump -V64-
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▪ Ignition switched off
Pull connector T2d off ABS hydraulic pump -V64- on control unit -J104
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- Connect earth and T2d/2 battery voltage to ABS hydraulic pump connector -V64- T2d/1
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Hydraulic pump -V64 runs fault free (max. 10 seconds)
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- Perform final control diagnosis
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Renew control unit -J104.
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Hydraulic pump -V64 does not run
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- Renew hydraulic unit -N55.
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