Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 200

The Multiport Fuel Injection System consists of
sensors which detect the engine conditions, the
ENGINE CONTROL MODULE (ECM) <M/T>/
POWERTRAIN CONTROL MODULE (PCM) <A/T>
which controls the system based on signals from
these sensors, and actuators which operate under
the control of the ECM <M/T>/PCM <A/T>. The ECM
<M/T>/PCM <A/T> carries out activities such as fuel
injection control, idle air control, and ignition timing
control. In addition, the ECM <M/T>/PCM <A/T> is
equipped with several diagnostic test modes which
simplify troubleshooting when a problem develops.

FUEL INJECTION CONTROL
The injector drive times and injector timing are
controlled so that the optimum air/fuel mixture is
supplied to the engine to correspond to the
continually-changing engine operation conditions. A
single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank to the fuel injectors by the fuel pump, with the
pressure being regulated by the fuel pressure
regulator. The regulated fuel is distributed to each of
the injectors. Fuel injection is normally carried out
once for each cylinder for every two rotations of the
crankshaft. The firing order is 1-2-3-4-5-6. Each
cylinder has a dedicated fuel injector. This is called
multiport. The ECM <M/T>/PCM <A/T> provides a
richer air/fuel mixture by carrying out "open-loop"
control when the engine is cold or operating under
high load conditions in order to maintain engine
performance. In addition, when the engine is under
normal operating temperature after warming-up, the
ECM <M/T>/PCM <A/T> controls the air/fuel mixture
by using the heated oxygen sensor signal to carry
out "closed-loop" control. The closed-loop control
achieves the theoretical air/fuel mixture ratio where
the catalytic converter can obtains the maximum
cleaning performance.

IDLE AIR CONTROL
The idle speed is kept at the optimum speed by
controlling the amount of air that bypasses the
throttle valve in accordance with changes in idling
conditions and engine load during idling. The ECM
<M/T>/PCM <A/T> drives the idle air control (IAC)
motor to keep the engine running at the pre-set idle
target speed in accordance with the engine coolant
temperature and A/C and other electrical load. In

addition, when the air conditioning switch is turned
off and on while the engine is idling, the IAC motor
adjusts the throttle valve bypass air amount
according to the engine load conditions to avoid
fluctuations in the engine speed.

IGNITION TIMING CONTROL
The ignition power transistor located in the ignition
primary circuit turns ON and OFF to control the
primary current flow to the ignition coil. This controls
the ignition timing to provide the optimum ignition
timing with respect to the engine operating
conditions. The ignition timing is determined by the
ECM <M/T>/PCM <A/T> from engine speed, intake
air volume, engine coolant temperature, and
atmospheric pressure.

DIAGNOSTIC TEST MODE

•

When an abnormality is detected in one of the
sensors or actuators related to emission control,
the SERVICE ENGINE SOON/MALFUNCTION
INDICATOR LAMP illuminates to warn the driver.

•

When an abnormality is detected in one of the
sensors or actuators, a diagnostic trouble code
corresponding to the abnormality is stored in the
ECM <M/T>/PCM <A/T>.

•

The RAM data inside the ECM <M/T>/PCM <A/
T> that is related to the sensors and actuators
can be read with the scan tool. In addition, the
actuators can be controlled by scan tool MUT-II
(MB991502) under certain circumstances.

OTHER CONTROL FUNCTIONS

1. Fuel Pump Control Turns the fuel pump relay ON

so that current is supplied to the fuel pump while
the engine is cranking or running.

2. A/C Compressor Clutch Relay Control Turns the

compressor clutch of the A/C ON and OFF.

3. Fan Relay Control The radiator fan and

condenser fan speeds are controlled in response
to the engine coolant temperature and vehicle
speed.

4. Generator Output Current Control Prevents

generator output current from increasing
suddenly and idle speed from dropping at times
such as when the headlights are turned on.

5. Evaporative Emission Purge Control (Refer to

GROUP 17, Emission Control System

−

Evaporative Emission Control System

−

General

Information.

P.17-90

)

6. EGR Control (Refer to GROUP 17, Emission

Control System

−

Exhaust Gas Recirculation

(EGR) System

−

General Information.

P.17-96

)

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