103
may operate ECU microprocessor to check whether the following accessories are running well or not: fuel pump, fuel
injector, and fuel vapor recirculation solenoid. After service, you may erase trouble code stored. To check stepper
motor, technician needs to start the engine before checking.
ECU memory stores a series of emergency parameters for resuming operation. The emergency function may
insure that cars may be drive home or sent to service center. The emergency parameters are indicated by special
LED.
According to
λ
sensor signal, ECU will automatically revise C0 parameter(close loop). When
λ
sensor fails, ECU may work under open loop.
2. Single Port Injection System Throttle Valve “30MM12”
“30MM12”throttle valve is one of the main system parts. Most sensors and actuators are assembled in
the throttle valve. Throttle valve features small accessories, compact structure, and a bran-new inner
geometry structure to better the fuel atomization from fuel injector and get the most proper mixture for
optimizing engine performance. Throttle valve is installed on intake manifold.
Throttle valve casting are consisted of upper and lower bodies. Upper body (cap) is for arranging fuel
passages, and the lower body is for controlling engine air intake volume. Fig. 136 indicates the throttle
valve structure.
Fig.162
The following accessories and engine air filter are installed on the upper body of throttle valve.
·
fuel
system pipe and fuel return pipe
·
fuel pressure regulator
·
bottom-supplying fuel injector
IWM
·
intake air temperature sensor.
