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13A-1

GROUP 13A

MULTIPORT FUEL
SYSTEM (MFI)
CONTENTS

GENERAL DESCRIPTION. . . . . . . . . 13A-2 FAN MOTOR CONTROL . . . . . . . . . . 13A-9

SENSOR. . . . . . . . . . . . . . . . . . . . . . . 13A-4 FUEL PRESSURE CONTROL, INTAKE
CHARGE PRESSURE CONTROL . . . 13A-9
FUEL INJECTION CONTROL . . . . . . 13A-5
CHARGE AIR COOLER WATER SPRAY
IDLE AIR CONTROL (IAC) . . . . . . . . 13A-6 CONTROL. . . . . . . . . . . . . . . . . . . . . . 13A-9

IGNITION TIMING AND DISTRIBUTION OTHER CONTROL FUNCTIONS . . . . 13A-9
CONTROL . . . . . . . . . . . . . . . . . . . . . 13A-7
ON-BOARD DIAGNOSTICS. . . . . . . . 13A-10
FUEL PUMP CONTROL . . . . . . . . . . 13A-8
13A-2 MULTIPORT FUEL SYSTEM (MFI)
GENERAL DESCRIPTION

GENERAL DESCRIPTION
M2132000100172
The control functions are basically the same as those
for the 2.0-liter turbocharged engine of the previous
ECLIPSE (D32A, D33A). In addition to the improve-
ments already adopted on the 2.4-liter engine of the
ECLIPSE (D52A), the following improvements have
been made:
IMPROVEMENT/ADDITION REMARK
Clutch pedal position switch Reduces the amount of hydrocarbon (HC) discharge by making fuel
injection volume corrections during shift changes.
Charge air cooler water spray Improves output performance during high-load operating conditions
control by spraying water on the charge air cooler, which cools the intake air
(if the AUTO mode is selected).
Fuel pump discharge volume Reduces the discharge of fuel vapors when the load on the engine is
switching control low by decreasing the fuel pump speed, which decreases the fuel
return volume. (This function is basically the same as for the 3.0-liter
turbocharged engine of the 3000GT.)
Fuel level sensor 2 Along with the adoption of the saddle type fuel tank, a fuel level
sensor is provided in each of the main and sub chambers of the fuel
tank. The engine control module (ECM) determines individually
whether fuel level sensor 1 or fuel level sensor 2 has become stuck.
MULTIPORT FUEL SYSTEM (MFI)
GENERAL DESCRIPTION
13A-3
SYSTEM BLOCK DIAGRAM

SENSOR, SWITCH ENGINE CONTROL MODULE(ECM) ACTUATOR

Volume airflow sensor No.1 injector

No.2 injector
Intake air temperature sensor
[1] Fuel injection control
No.3 injector
Barometric pressure sensor
No.4 injector
Engine coolant temperature
sensor [2] Idle speed control Idle air control motor
(Stepper motor)
Throttle position sensor
[3] Ignition timing control Ignition coil
(Ignition power transistor)
Crankshaft position sensor [4] Power supply control
(Power supply to sensor, MFI relay
Camshaft position sensor actuator)
[5] Fuel pump control Fuel pump relay 2 (ON/OFF)
Knock sensor
[6] Heated oxygen sensor heater
control Fuel pump relay 3 (HI/LO)
Vehicle speed sensor
[7] A/C compressor clutch relay Heated oxygen sensor heater
Clutch pedal position switch control
[8] Fuel pressure control A/C compressor clutch relay
Heated oxygen sensor
Fuel pressure solenoid
[9] Intake charge pressure control
A/C switch
Turbocharger wastegate
A/C load signal [10] Fan motor control solenoid
(Radiator, A/C condenser)
Fan control module (Radiator fan)
Power steering pressure switch [11] Volume airflow sensorreset
signal control
Generator FR terminal Condenser fan relay (HI, LO)
[12] Generator control
Manifold differential pressure Volume airflow sensor
sensor
[13] EVAP emission control
Fuel tank differential pressure Generator G terminal
sensor
[14] EGR control EVAP purge solenoid
Fuel temperature sensor
[15] Intercooler water spray control
EVAP ventilation solenoid
Fuel level sensor
[16] Service engine soon/
Charge air cooler water spray malfunction indicator lamp EGR solenoid
switch (AUTO) control

[17] Diagnostic output Charge air cooler water spray relay
Charge air cooler water spray
switch (MANUAL)
[18] RAM data transmission Charge air cooler water spray lamp
Ignition switch-IG
Service engine soon/
malfunction indicator lamp
Ignition switch-ST
Diagnostic output terminal
Power supply

AK202518
13A-4 MULTIPORT FUEL SYSTEM (MFI)
SENSOR

SENSOR
M2132001000101

CLUTCH PEDAL POSITION SWITCH
The clutch pedal position switch is a contact type switch that is
CLUTCH PEDAL mounted on the clutch pedal assembly to detect the pressing of
POSITION SWITCH
the clutch pedal.
When the driver presses the clutch pedal while shifting gears,
the contacts of the clutch pedal position switch close. This
causes the positive battery voltage applied by the engine con-
trol module (ECM) to be grounded to the body via the clutch
pedal assembly. Upon detecting this signal, the ECM makes
fuel injection volume corrections during a shift change, thus
reducing the discharge of hydrocarbon (HC) emissions associ-
ated with insufficient release of the accelerator pedal.
CLUTCH PEDAL

ECM
B+
CLUTCH PEDAL
POSITION SWITCH

AK202519 AB
MULTIPORT FUEL SYSTEM (MFI)
FUEL INJECTION CONTROL
13A-5
FUEL INJECTION CONTROL
M2132003000130
The fuel injection control is basically the same as When the driver presses the clutch pedal while shift-
that for the 2.0-liter turbocharged engine installed on ing gears, this control changes the fuel injection vol-
the previous ECLIPSE. ume for a predetermined length of time after the
A clutch pedal position switch has been newly added verification time has elapsed.
to provide fuel correction control during shift
changes.
.

System Configuration Diagram

VOLUME AIRFLOW SENSOR
BAROMETRIC PRESSURE SENSOR

INTAKE AIR TEMPERATURE SENSOR

ENGINE COOLANT TEMPERATURE
SENSOR
FUEL
PRESSURE THROTTLE POSITION SENSOR
SOLENOID
ECM CRANKSHAFT POSITION SENSOR
FUEL FROM CAMSHAFT POSITION SENSOR
TO FUEL PRESSURE FUEL
TANK REGULATOR PUMP
KNOCK SENSOR
INJECTOR
VEHICLE SPEED SENSOR
IGNITION SWITCH-ST
HEATED OXYGEN SENSOR
CLUTCH PEDAL POSITION SWITCH

AK202520 AB
13A-6 MULTIPORT FUEL SYSTEM (MFI)
IDLE AIR CONTROL (IAC)

IDLE AIR CONTROL (IAC)
M2132004000133
The idle air control is basically the same as that for
the 2.4L engine installed in the ECLIPSE.
.

System Configuration Diagram

VOLUME AIRFLOW SENSOR
BAROMETRIC PRESSURE SENSOR
INTAKE AIR TEMPERATURE SENSOR
BIMETAL IDEL AIR CONTROL ENGINE COOLANT TEMPERATURE
TYPE (IAC) MOTOR SENSOR
LIMITER (STEPPER MOTOR)
THROTTLE POSITION SENSOR
CRANKSHAFT POSITION SENSOR
ECM A/C SWITCH
A/C LOAD SIGNAL
TO INTAKE FROM AIR VEHICLE SPEED SENSOR
MANIFOLD CLEANER
POWER STEERING PRESSURE SWITCH
GENERATOR FR TERMINAL
IGNITION SWITCH-IG
IGNITION SWITCH-ST
DIAGNOSTIC TEST MODE

SPEED ADJUSTING SCREW
AK202521 AB
MULTIPORT FUEL SYSTEM (MFI)
IGNITION TIMING AND DISTRIBUTION CONTROL
13A-7
IGNITION TIMING AND DISTRIBUTION CONTROL
M2132005000136
The ignition timing and distribution control is basi-
cally the same as that for the 2.4L engine installed in
the ECLIPSE.
.

System Configuration Diagram

IGNITION SWITCH BATTERY
VOLUME AIRFLOW SENSOR
BAROMETRIC PRESSURE SENSOR
INTAKE AIR TEMPERATURE SENSOR
ENGINE COOLANT TEMPERATURE
SENSOR
CRANKSHAFT POSITION SENSOR ECM IGNITION IGNITION
COIL B COIL A
CAMSHAFT POSITION SENSOR
VEHICLE SPEED SENSOR
KNOCK SENSOR
IGNITION SWITCH-ST
DIAGNOSTIC TEST MODE

SPARK
TO TACHOMETER PLUG

CYLINDER NO. 2 3 4 1

AK203777 AB
13A-8 MULTIPORT FUEL SYSTEM (MFI)
FUEL PUMP CONTROL

FUEL PUMP CONTROL
M2132017500019

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