Ford Transit 2002 Owner's Manual page 837

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The pulse for the rotational angle sensor is generated by a pickup wheel which is rigidly
mounted onto the input shaft. It has four gaps in the teeth evenly distributed around its
circumference (the four gaps correspond to the number of cylinders).
A rotational angle sensor scans the sequence of teeth and gaps.
The rotational angle sensor generates its signal relative to the angular position of the roller
ring. For this reason it is attached to a rotating mounting and is turned together with the
roller ring when the injection regulator is moved.
When the injection is adjusted by the injection regulator, the roller ring and therefore the
rotational angle sensor is rotated in the direction of advancing or retarding the injection
timing.
The signal from the rotational angle sensor is transmitted via a flexible conductor film
to the pump control unit and then used for the following tasks:
Measurement of the current rotational speed of the distribution injection pump,
Determination of the current angular position,
Determination of the current position of the injection regulator.
The current rotational speed of the distribution injection pump is an input variable for the
pump control unit of the distribution injection pump. The pump control unit uses it to obtain
the actuation time of the high-pressure solenoid valve and the injection regulator solenoid
valve.
The designated injection quantity determines the actuation time of the high-pressure
solenoid valve. The current angular position determines the actuation timing points for the
Description
Flexible conducting film
Rotational angle sensor
Rotating bearing ring
Pickup wheel (fixed onto the input shaft)
Input shaft
Connection between roller ring and injection regulator
Gap in the teeth
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