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Executing self diagnosis
Fault table
Notes on fault table
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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, are listed on the following pages according to the 5 digit fault code.
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◆ Fault code and flash code appear (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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Flash code
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5 digit
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4 digit
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00277
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1221
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◆ Additionally the type of fault can also appear in the fault table.
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◆ Reference is made to individual test steps of the Electrical test in the column "Rectifying fault".
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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.
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◆ After carrying out repairs, always interrogate and erase the fault memory with fault reader V.A.G 1551, also carry out a road test (exceeding a speed of 40 km/h (25 mph).
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◆ Repeat the self-diagnosis after the road test.
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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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000004444
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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 the display, the ABS system does not operate properly, then proceed as follows:
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1. Carry out road test exceeding 40 km/h,
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2. Again interrogate fault memory, if there is still no fault stored,
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3. Commence fault finding without self diagnosis and work through the complete
Electrical test
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002571112
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Front left ABS inlet valve - N 101
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 17 and 37
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002591114
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Front right ABS inlet valve - N 99
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 18 and 38
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1)
, 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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002651132
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Front left ABS outlet valve - N 102
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 21 and 37
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002671134
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Front right ABS outlet valve- N100
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 22 and 38
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002731211
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Rear right ABS inlet valve - N133
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 20 and 40
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002741212
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Rear left ABS inlet valve- N134
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 19 and 39
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1)
, 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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002751213
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Rear right ABS outlet valve - N135
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 24 and 40
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002761214
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Rear left ABS outlet valve- N136
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 23 and 39
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002791223
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Differential lock valve 1 - N 125
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 25 and 41
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002801224
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Differential lock valve 2 - N 126
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Defective wire, connector or valve winding
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- Check wiring, connectors and valve winding:
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=>Test step No.1) 26 and 41
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1)
, 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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002831233
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Front left speed sensor
- G 47
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Open circuit, short circuit or loose contact in:
- Speed sensor wire
- Connector
- Speed sensor winding
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- Check wiring, connectors, speed sensor, earth wiring to control unit and also capacitor for correct earth connection:
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=>Test step No.1) 7,11 and 34
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Mechanical fault2)
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Excessive or insufficient air gap between speed sensor and impulse wheel (signal not OK)
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- Check installation of speed sensor and impulse wheel; clean if necessary
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Signal outside the tolerance2)
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Impulse wheel and speed sensor dirty or damaged
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- Renew impulse wheel/speed sensor
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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002851241
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Front right speed sensor
- G 45
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Open circuit, short circuit or loose contact in:
- Speed sensor wire
- Connector
- Speed sensor winding
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- Check wiring, connectors, speed sensor, earth wiring to control unit and also capacitor for correct earth connection:
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=>Test step No.1) 6,10 and 33
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Mechanical fault2)
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Excessive or insufficient air gap between speed sensor and impulse wheel (signal not OK)
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- Check installation of speed sensor and impulse wheel; clean if necessary
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Signal outside the tolerance2)
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Impulse wheel and speed sensor dirty or damaged
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- Renew impulse wheel/speed sensor
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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002871243
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Rear right speed sensor
- G 44
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Open circuit, short circuit or loose contact in:
- Speed sensor wire
- Connector
- Speed sensor winding
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- Check wiring, connectors, speed sensor, earth wiring to control unit and also capacitor for correct earth connection:
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=>Test step No.1) 8,12 and 31
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Mechanical fault2)
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Excessive or insufficient air gap between speed sensor and impulse wheel (signal not OK)
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- Check installation of speed sensor and impulse wheel; clean if necessary
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Signal outside the tolerance2)
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Impulse wheel and speed sensor dirty or damaged
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- Renew impulse wheel/speed sensor
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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002901311
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Rear left speed sensor
- G 46
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Open circuit, short circuit or loose contact in:
- Speed sensor wire
- Connector
- Speed sensor winding
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- Check wiring, connectors, speed sensor, earth wiring to control unit and also capacitor for correct earth connection:
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=>Test step No.1) 9, 13 and 32
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Mechanical fault2)
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Excessive or insufficient air gap between speed sensor and impulse wheel (signal not OK)
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- Check installation of speed sensor and impulse wheel; clean if necessary
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Signal outside the tolerance2)
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Impulse wheel and speed sensor dirty or damaged
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- Renew impulse wheel/speed sensor
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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002921313
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Hydraulic energy supply pressure level
Mechanical fault2)
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Pressure loss through leaks or air in the hydraulic unit and brake system
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- Bleed brake system
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Hydraulic pump (V64) not producing sufficient pressure
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- If necessary replace ABS hydraulic unit and tandem master cylinder
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- After repairs erase fault memory with V.A.G 1551
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005322234
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Supply voltage
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Defective wiring, connectors, fuses S54 and S4 or ABS relay (J102)
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- Check fuses, wiring, connectors, earth wiring and the voltage supply to control unit:
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=>Test step-No.1) 1 ... 4, 14and 30
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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005472133
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ABS pressure control switch
- F1372)
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Wire between contact 13 and contact 26 of control unit (J104) with component F137 has connection to battery + or battery -
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- Visual check of wiring between contact 13 and contact 26
=> Current flow diagrams, Electrical fault finding and Fitting locations
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- Unplug multi-pin connector from control unit, connect to test box V.A.G 1598 and V.A.G 1598/10 and use hand multimeter V.A.G 1526 to measure voltage between contacts:
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13 and 1 = max. 0.1 V
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26 and 1 = max. 0.1 V
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=>Test step No.1) 29
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1)
, Electrical check
2)
Is only required for ABS/EDL (control unit 1H0 907 379A)
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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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00599
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Pressure/brake light switch plausibility
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Defective wiring, connectors, pressure control switch (F137), fuse S20 or brake light switch (F)
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- Visual check of wire routing from brake light switch (F), pressure control switch (F137) and fuse S20:
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=>Test step-No.1) 5 and 29
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Time delay between brake light switch signal and pressure control switch signal excessive
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- Ensure that the brake light switch signal enters the control unit before the pressure control switch signal, if necessary adjust brake light switch=> Page 01-87
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1)
, 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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00634
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EDL series resistance
- N159
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Defective wiring, connectors, EDL relay (J310) or EDL series resistance (N159)
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- Check wiring, connectors, EDL relay (J310) and EDL series resistance (N159):
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=>Test step No.1) 15, 35 and 36
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- Check EDL series resistance (N159) for continuity (using adapter set V.A.G 1594 and hand multimeter V.A.G 1526 in 200 Ohm range), specification: max. 2 ω, replace if necessary
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1)
, 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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007933231
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Brake pedal position sender -G100
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Defective wiring, connectors, clutch pedal position sender (G100) or short to battery + / battery -
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- Check wiring, connectors and brake pedal position sender (G100):
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=>Test step No.1) 28
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Mechanical fault2)
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- Unplug multi-pin connector from control unit, connect to test box V.A.G 1598 with adapter V.A.G 1598/10 and use hand multimeter V.A.G 1526 to measure voltage between the contacts:
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16 and 1 = max. 0.1 V
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41 and 1 = max.0.1 V
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 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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012764133
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ABS hydraulic pump
-V64
Signal outside the tolerance2)
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Defective wiring, connectors, hydraulic pump relay (J185), ABS hydraulic pump (V64) or hydraulic pump sender (G101)
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- Check wiring, connectors, hydraulic pump relay (J185), ABS hydraulic pump (V64) and hydraulic pump sender (G101):
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=>Test step-No.1) 15, 27, 35 and 36
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655351111
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Control unit defective
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Electrical faults caused by outside interference, poor earth connections, poor positive connections to control unit (J104)
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- Check wiring, connectors and earth wires to control unit and voltage supply:
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=>Test step No.1) 1...4, 14 and 30
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Control unit defective
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- Renew control unit if necessary
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1)
, Electrical check
2)
Type of fault, this fault is only recognised above 40 km/h (25 mph) (carry out test drive).
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