Code 45721 or 25721

Cause Of Fault
No signal or continuity from travel sensor.

Symptom
The ANTI LOCK light comes on.

Action
1. Connect breakout box
2. Check voltage between pins 41 and 16 in accordance with the table.
3. Remove the travel sensor.
- Check resistance in accordance with the table.
- If the value is correct, clear the code and test-drive the car.
- If the code returns, fit a new Electronic Control Unit (ECU).
See Actions Before Replacing ECU.

Travel Sensor Specifications Table
Position Of Travel Sensor: 1
Resistance in Ohms: 250
Voltage in Volts: 1.0
Position Of Travel Sensor: 2
Resistance in Ohms: 437
Voltage in Volts: 1.7
Position Of Travel Sensor: 3
Resistance in Ohms: 564
Voltage in Volts: 2.3
Position Of Travel Sensor: 4
Resistance in Ohms: 691
Voltage in Volts: 2.8
Position Of Travel Sensor: 5
Resistance in Ohms: 817
Voltage in Volts: 3.3
Position Of Travel Sensor: 6
Resistance in Ohms: 1034
Voltage in Volts: 4.1
Position Of Travel Sensor: 7
Resistance in Ohms: OL
Voltage in Volts: 10.0