E.C.C. DESCRIPTION (Models with catalyzer) — Components (Cont'd)

EF & EC-33prose procedure

Applies to GA13DS, GA14DS & GA16DS engines with catalyzer. Crank angle sensor, power transistor & ignition coil, and A.I.V. control solenoid valve sections apply only to models with E.G.R.

Continued from EF & EC-32

GA13DS, GA14DS & GA16DS

Components (Cont'd)

CRANK ANGLE SENSOR (Models with E.G.R.)

The crank angle sensor is a basic component of the entire E.C.C. It monitors engine speed and piston position, and sends to the E.C.U. signals on which the controls of ignition timing and other functions are based.

The crank angle sensor has a rotor plate and a wave forming circuit. The rotor plate has 360 slits for 1° signal (engine speed signal) and 4 slits for 180° signal (crank angle signal). Light Emitting Diodes (L.E.D.) and Photo Diodes are built in the wave forming circuit.

When the rotor plate passes the space between the L.E.D. and the Photo Diode, the slits of the rotor plate continually cut the light which is sent to the photo diode from the L.E.D. This causes generating rough-shaped pulses. They are then converted into on-off pulses by the wave forming circuit, which are sent to the E.C.U.

POWER TRANSISTOR & IGNITION COIL (Models with E.G.R.)

The ignition signal from the E.C.U. is amplified by the power transistor, which turns the ignition coil primary circuit on and off, inducing the proper high voltage in the secondary circuit. The ignition coil is a small, molded type.

VEHICLE SPEED SENSOR

The vehicle speed sensor provides a vehicle speed signal to the E.C.U.

The speed sensor consists of a reed switch, which is installed in the speed meter unit and transforms vehicle speed into a pulse signal.

A.I.V. CONTROL SOLENOID VALVE (Models with E.G.R.)

This three-port solenoid valve controls the "cold" A.I.V. vacuum line, based on signals supplied by the E.C.U. The second A.I.V. line, called the "hot" line is not controlled by the E.C.U. Refer to A.I.V. description for further details.

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