Code 53428, 33428 or 334B4

Cause Of Fault
Defective right rear outlet valve, break in continuity/ short-circuit to ground/ + 12 V in the wiring loom of the valve or defective Electronic Control Unit (ECU).

Symptom
The ANTI LOCK light is lit.

Action
1. With the ECU disconnected, check the circuit between pins 3 and 18 on the Antilock Brake System (ABS) ECU via the breakout box.
- The resistance should be 3-4 Ohms.
- If the circuit is OK, clear the trouble code and test-drive the car to check whether the trouble code is triggered again.
If so, see Actions Before Replacing ECU.
- If the circuit is defective, continue as follows:
2. Check that the winding of the main valve is intact by measuring the resistance between pin 5 and 10 or 1 on the valve.
- If the resistance is incorrect, fit a new hydraulic unit.
- If the resistance is now correct, the fault is in the wiring harness, go to step No. 3.
3. Check the brown and white wire between pin 5 on the main valve and pin 18 on the ABS ECU for a break in continuity/short-circuit.
4. Check the wire between pin 10 or 1 on the main valve and pin 3 on the ABS ECU for a break in continuity/short-circuit.