Defect Code 12

Defect Code 12:

Explanation:

Rear left plunger solenoid valve malfunction

Possible cause:

Short or break on control wire to plunger hydraulic unit

Short or break on B+ supply wire from ABS hydraulic unit to plunger hydraulic unit

Solenoid valve defective

Troubleshooting:

Switch off ignition and detach control unit connector

Measure resistance at control unit connector (X11) Pin 21/23;

Nominal value: 0.8...1.8 Ohm

Measure inductance at control unit connector (X11) Pin 21/23 (see SVT Operating Manual):

Nominal value: approx. 20 mH

If necessary, remove plunger hydraulic unit (see Repair Instructions Group 34), ensure plug connection is firmly fitted and check for corrosion, measure internal resistance of the solenoid valve directly at the plunger hydraulic unit.

Replace ABS/ASC+T control unit if no defect can be found on the wiring harness side.