Rover Group Cars

Lucas AB17 ECU Ignitiont
Sensor Information

Crankshaft Angle Sensor (CAS)

(Note CAS fitted to later the Rover MEMS system is generally similar)


Location: On rear of engine, it is mounted on the engine side of adapter plate between engine and bellhousing.

Description: Inductive pick up, connecting plug often blue in colour.

Connection to ECU: Connects to ignition ECU via pins 4 and 6.

Output Voltage: Sine wave, about 5 volts peak to peak (roughly 3.25 Volts RMS) with engine running at 2000 RPM. Output voltage at cranking speed generally much lower

Testing
Notes:

This probe is easily damaged mechanically, the probe tip projects into the bellhousing is mounted very close to the moving parts, hence is very vulnerable to a build up of debris.
The connecting plug is also very exposed to vibration, oil leaks and road dirt.

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