Audi Workshop Service and Repair Manuals

Notes:

• ◆ If the ABS/EDS control unit detects a spinning wheel, the ABS/EDS control unit generates the rough road signal.
  If the engine control unit detects the rough road signal, the misfire detection is switched off in engine control unit.
• ◆ The rough road signal must only be tested if the fault "18014 (P1606) Rough road detection/engine specified torque ABS CU, electrical fault in circuit" is stored.
  The possible additional fault "Misfire" is then a sequential fault and can be ignored.
• ◆ The wiring and rough road signal are monitored by the engine control unit

Test conditions

• ● Control unit code OK .

Test sequence

• ‒ Switch ignition off.
• ‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit must not be connected => Page 24-23.
• ‒ Check wiring from socket 74 on test box to ABS control unit for short circuit or open circuit according to current flow diagram.

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations

If no wiring fault is detected:

• ‒ Replace ABS control unit.

If fault is re-displayed after replacing ABS control unit:

• ‒ Replace engine control unit => Page 24-30.