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Performing self diagnosis
Fault table
Notes on fault table
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◆ When commencing fault finding of the vehicle control units, always start with function "Automatic test sequence" by pressing keys 0 and 0. This interrogates the fault memories of the control units in the vehicle.
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◆ All the possible faults which can be recognised by the ABS control unit -J104- and printed-out on V.A.G 1551 or VAS 5051, are listed on the following pages according to the 5 digit fault code.
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◆ Fault code appears (in the "Rapid data transfer" mode) only on the print-out.
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Example:
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Fault code
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Fault type code
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5 digit
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3 digit
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00283
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035
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◆ The 3 digit fault type code is a data code and may be disregarded, but the fault type text is of use.
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◆ Before replacing components indicated as being faulty, check all the appropriate connectors, wiring and earth connections using the current flow diagram =>Current flow diagrams, Electrical fault finding and Fitting locations binder.
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◆ On completion of repairs always interrogate the fault memory with fault reader V.A.G 1551 or the new tester VAS 5051 and erase.
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◆ Carry out road test exceeding 20 km/h (13 mph).
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◆ After the road test interrogate fault memory again.
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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No fault recognised
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If "No fault recognised" appears after carrying out repairs, self diagnosis is ended.
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If, despite "No fault recognised" appearing in the display, the ABS system does not function properly, then proceed as follows:
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1. Carry out road test exceeding 20 km/h (13 mph),
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2. Again interrogate fault memory, if there is still no fault stored,
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3. Continue fault finding without self-diagnosis and work through the complete
Electrical check
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00283
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Front left speed sensor
-G47
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G47- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Damaged rotor or speed sensor -G47
- Speed sensor windings -G47- defective
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- Check speed sensor -G47- and rotor for damage
Renew rotor/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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If the fault occurs again:
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00283
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Front left speed sensor
-G47
Signal outside tolerances1)
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G47 and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Electrical interference from other sources (high frequency radiation e.g. non-insulated ignition cable)
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- Read measured value block
Display group number 001
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- Damaged rotor or speed sensor -G47
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- Excessive air gap between speed sensor -G47- and rotor (signal not OK.)
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- Check speed sensor -G47- and rotor for damage
Renew rotor/speed sensor
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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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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00283
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Front left speed sensor
-G47
Mechanical fault1)
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- Excessive air gap between speed sensor -G47- and rotor (signal not OK.)
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- Check installation of speed sensor -G47- and rotor
=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles01-60
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If the fault occurs again:
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- Outlet valve in hydraulic unit -N55- defective
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- Renew hydraulic unit -N55
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00285
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Front right speed sensor
-G45
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G45- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Damaged rotor or speed sensor -G45
- Speed sensor windings -G45- defective
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- Check speed sensor -G45- and rotor for damage
Renew rotor/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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If the fault occurs again:
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00285
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Front right speed sensor
-G45
Signal outside tolerances1)
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G45- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Electrical interference from other sources (high frequency radiation e.g. non-insulated ignition cable)
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- Read measured value block
Display group number 001
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- Damaged rotor or speed sensor -G45
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- Excessive air gap between speed sensor -G45- and rotor (signal not OK.)
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- Check speed sensor -G45- and rotor for damage
Renew rotor/speed sensor
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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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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00285
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Front right speed sensor
-G45
Mechanical fault1)
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- Excessive air gap between speed sensor -G45- and rotor (signal not OK.)
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- Check installation of speed sensor -G45- and rotor
=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles01-60
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If the fault occurs again:
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- Outlet valve in hydraulic unit -N55- defective
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- Renew hydraulic unit -N55
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00287
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Rear right speed sensor
-G44
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G44- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Damaged rotor or speed sensor -G44
- Speed sensor windings -G44- defective
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- Check speed sensor -G44- and rotor for damage
Renew rotor/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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If the fault occurs again:
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00287
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Rear right speed sensor
-G44
Signal outside tolerances1)
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G44- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from page 01-77
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- Electrical interference from other sources (high frequency radiation e.g. non-insulated ignition cable)
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- Read measured value block
Display group number 001
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- Damaged rotor or speed sensor -G44
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- Excessive air gap between speed sensor -G44- and rotor (signal not OK.)
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- Check speed sensor -G44- and rotor for damage
Renew rotor/speed sensor
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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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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00287
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Rear right speed sensor
-G44
Mechanical fault1)
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- Excessive air gap between speed sensor -G44- and rotor (signal not OK.)
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- Check installation of speed sensor -G44- and rotor
=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles01-60
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If the fault occurs again:
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- Outlet valve in hydraulic unit -N55- defective
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- Renew hydraulic unit -N55
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00290
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Rear left speed sensor
-G46
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G46- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Speed sensor windings -G46- defective
- Damaged rotor or speed sensor -G46
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- Check speed sensor -G46- and rotor for damage
Renew rotor/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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If the fault occurs again:
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00290
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Rear left speed sensor
-G46
Signal outside tolerances1)
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- Open circuit, short to positive or earth, or loose contact in connections between speed sensor -G46- and control unit -J104
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- Check wiring and connections using current flow diagram
Perform electrical checks =>from Page 01-77
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- Electrical interference from other sources (high frequency radiation e.g. non-insulated ignition cable)
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- Read measured value block
Display group number 001
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- Damaged rotor or speed sensor -G46
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- Excessive air gap between speed sensor -G46- and rotor (signal not OK.)
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- Check speed sensor -G46- and rotor for damage
Renew rotor/speed sensor
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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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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00290
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Rear left speed sensor
-G46
Mechanical fault1)
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- Excessive air gap between speed sensor -G46- and rotor (signal not OK.)
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- Check installation of speed sensor -G46- and rotor
=> Brake systems; Repair group 45; Removing and installing parts of ABS system on front and rear axles01-60
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If the fault occurs again:
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- Outlet valve in hydraulic unit -N55- defective
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- Renew hydraulic unit -N55
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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00668
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Vehicle voltage terminal 30
Signal outside tolerances
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- Open circuit, short to positive or earth in the wiring
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- Check wiring and connections using current flow diagram
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- Perform electrical checks =>from Page 01-77
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01044
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Control unit incorrectly coded
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- Control unit -J104- incorrectly coded
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- Check coding for control unit -J104-
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- Coding bridge in multi-pin connector to control unit -J104- open or short circuit
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- Check wiring and connections using current flow diagram
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- Perform electrical checks =>from Page 01-77
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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01130
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ABS operation
Implausible signal1)
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- Electrical interference from other sources (high frequency radiation e.g. non-insulated ignition cable)
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- Erase fault memory
Perform test drive at more than 20 km/h (13 mph)
Interrogate fault memory again
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- Open circuit, short to positive or earth in the wiring
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- Check wiring and connections using current flow diagram
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- Perform electrical checks =>from Page 01-77
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If the fault occurs again:
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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01276
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ABS hydraulic pump
-V64
Signal outside tolerances1)
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- Hydraulic pump connection -V64- to control unit
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- Perform final control diagnosis => Page 01-60
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- Open circuit, short to positive or earth in the wiring
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- Check wiring and connections using current flow diagram
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- Perform electrical checks =>from Page 01-77
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- Hydraulic pump -V64- defective
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- If hydraulic pump -V64- runs fault-free when test step No. 18 of electrical check is performed => Page 01-77
, the control unit -J104- must be renewed.
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- ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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1)
Type of fault, this fault is only recognised above 20 km/h (13 mph) (carry out test drive).
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V.A.G 1551 print-out
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Possible cause of fault
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Rectifying fault
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65535
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Control unit defective
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ABS control unit -J104- defective
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- Renew control unit -J104
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=> Brake systems; Repair group 45
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