1: C1522 - ABS to instrument panel data line
ERROR DETAILS:
Vehicle speed: 2,750 km/h
Brake light switch: ON
There is one or more dialogue lines among the different systems that are installed on board: in this case the anomaly concerns the line or the lines between the ABS system and the instrument board.
Possible causes can be related to a short circuit to the ground or to an anomaly in the instrument board.
The fault is not detected now, but it is stored in memory. Clear fault codes, and observe for future appearance of the same fault. Dashboard warning light was activated for this fault.
2: C1200 - Front right speed sensor, wiring error
ERROR DETAILS:
Vehicle speed: 2,750 km/h
Brake light switch: OFF
The speed signal of the indicated wheel is missing or wrong.
Check:
1) the wheel sensor and the associated wiring to the ABS ECU for opens, shorts and weak connections, and the ECU for proper ground.
2) the sensor continuity and resistance
3) the ECU ground connection
4) the air gap between sensor and impulse ring
5) the impulse ring and sensor to have no signs of damage or deformation, and to be free of magnetic dust
6) the wheel bearing for excessive play
NOTE:
1) It is ESSENTIAL that all the rims and tires are of the same size, as specified by the manufacturer, and that the tires have correct pressure and show uniform wear
2) using an Oscilloscope to check the signal gives an excellent visual reference of the signal integrity and enables easy comparison between the wheel sensors.
3) this code may be set if a wheel is rotated independently when the car is lifted up and the Key is ON
The reason for this fault is that ECU did not receive signal from the sensor. The fault is not detected now, but it is stored in memory. Clear fault codes, and observe for future appearance of the same fault. Dashboard warning light was activated for this fault.