Defect Code 17

Defect Code 17:

Explanation:

Plunger accumulator charging longer than 15 seconds or incorrect pressure signal

Possible cause:

Mechanical or hydraulic defect in plunger system

Short to ground or break on the pressure signal wire from the plunger hydraulic unit to the ABS/ASC+T control unit

Accumulator charging valve does not open Pressure sensor defective

Troubleshooting:

Switch on ignition and measure voltage at the control unit connector (X11) Pin 13: nominal value: <1.5 V or >3.5 V;

Nominal value OK:

- Visually inspect all hydraulic lines and connections, renew defective parts if necessary

- Check function of tandem hydraulic pump in accordance with Repair Instructions and renew defective parts if necessary

Nominal value not OK:

- Remove plunger hydraulic unit in accordance with Repair Instructions

- Ensure plug connections are firmly fitted and check for corrosion

- Check B+ supply wire from control unit connector (X11) Pin 17 to pressure sensor connector (X 18025) Pin 5 and repair if necessary

- Check pressure signal wire from control unit connector (X11) Pin 13 to pressure sensor connector (X 18025) Pin 1 and repair if necessary

- Check ground wire to pressure sensor connector (X 18025) Pin 2 and repair if necessary