E.C.C. DESCRIPTION (Models with catalyzer) — Components (Cont'd)
EF & EC-32prose procedureApplies to GA13DS, GA14DS & GA16DS engines with catalyzer. Boost pressure sensor and E.G.R. & canister control solenoid valve sections apply only to models with E.G.R.
GA13DS, GA14DS & GA16DS
Components (Cont'd)
ENGINE TEMPERATURE SENSOR
The engine temperature sensor, built into the water jacket of the intake manifold, monitors change in water temperature and transmits a signal to the E.C.U. The temperature sensing unit employs a thermistor which is very sensitive in the low temperature range. The electrical resistance of the thermistor decreases in response to the temperature rise.
THROTTLE VALVE SWITCH
The throttle valve switch is attached to the carburetor and actuates in response to accelerator pedal movement. This switch has the idle contact. The idle contact opens when the throttle valve is positioned at idle and closes when it is at any other position.
NEUTRAL SWITCH
The neutral switch detects the transmission gear selector's position and transmits an electric signal to the control unit.
CLUTCH SWITCH
The clutch switch detects the clutch position (depressed or released) and transmits an electric signal to the control unit.
BOOST PRESSURE SENSOR (Models with E.G.R.)
Boost pressure sensor detects the low intake manifold vacuum and transmits an electrical signal to the control unit.
E.G.R. & CANISTER CONTROL SOLENOID VALVE (Models with E.G.R.)
The E.G.R. and canister systems are controlled only by the E.C.U. At both low- and high-speed revolutions of engine, the solenoid valve turns on and accordingly the E.G.R. control valve and canister cut the exhaust gas and fuel vapor leading to the intake manifold.