Page 645 of 1865
4C EEC SYSTEM
Solenoid Valve
1. Remove the solenoid valve.
76G04C-159
2. Connect vacuum hoses to the valve as shown in
the figure.
3. Blow air through the valve from hose A and check
that air comes out of the valve air filter.
4. Apply 12V and ground the solenoid valve with jum-
per wires.
5. Blow air through the valve from hose A and check
that the air comes out of port B.
6. Replace, if necessary.
86U04A-151
Two-way check valve
Inspection
1. Remove the two-way check valve.
76G04C-160
4C-84
Connect a pressure gauge to the passage that nor-
mally is connected to the fuel tank.
Blow through the valve from port A. Verify that the
valve opens at 2.94 kPa (0.03 kg/cm2,0.43 psi).
Remove the pressure gauge and connect
it
to the
passage to atmosphere.
Blow through the valve from port B. Verify that the
valve opens at 0.98 kPa (0.01 kg/cm2,0.14 psi).
Page 646 of 1865
EEC SYSTEM 4C
®(
Atomosphere
side Fuel tank side
76G04C-212
Replacement
1. Remove the two-way check valve.
2. Install a new valve so that the arrow on the valve
faces atmosphere side.
— - ...
h§§
IB// i \
1 S LCD \
1
J M
J k
Separator
^ X
IB// i \
1 S LCD \
1
J M
J k ==J/
J——K
1
Separator
1. Remove the separator.
2. Visually check the separator for damage.
3. Replace, if necessary.
86U04A-154
4C—85
Page 648 of 1865
EXHAUST SYSTEM (UNLEADED FUEL) 4C
EXHAUST SYSTEM (UNLEADED FUEL)
Exhaust manifold
Catalytic converter
Main silencer
Middle pipe
76G04C-163
The catalytic converter is used to reduce CO and HC. The converter contains a compound of plati-
num and rhodium. It is a two-way catalyst type with a volume of 2,300 cc (140 cu in).
4C—87
Page 649 of 1865
4C EXHAUST SYSTEM (UNLEADED FUEL)
REMOVAL AND INSTALLATION
1. Remove in the sequence shown in the figure.
2. Install in the reverse order of removal.
Torque Specifications
86U04A-159
4. Catalytic converter
5. Bracket
6. Front pipe
INSPECTION
1. Check the catalytic converter and exhaust pipe for
deterioration or restriction.
2. Check the insulation covers welded onto the cata-
lytic converter for damage.
Note
If the insulation cover is touching the catalytic
converter housing, excessive heat at the floor
will occur.
19—26 N-m (1.9—2.6 m-kg, 14—19 tt-lb)
29—39 N-m (3.0—4.0 m-kg, 22—29 ft-lb)
34—49 N-m (3.5—5.0 m-kg, 26—36 ft-lb)
39—57 N-m (4.0-5.8 m-kg, 29—42 ft-lb)
37—52 N m (3.8—5.3 m-kg, 27—38 ft-lb) 8—11 N-m 8—1.1 m-kg, 69—95 In-lb)
N-m .3 m-kg, 38 ft-lb)
1. Main silencer
2. Middle pipe
3. Pre-silencer
86U04A-160
4C—88
Page 650 of 1865
EXHAUST SYSTEM (LEADED FUEL) 4C
EXHAUST SYSTEM (LEADED FUEL)
Pre silencer (No.1)
Main silencer
Middle pipe
76G04C-164
4C-89
Page 651 of 1865
4C EXHAUST SYSTEM (LEADED FUEL)
REMOVAL AND INSTALLATION
1. Remove in the sequence shown in the figure.
2. Install in the reverse order of removal.
Torque Specifications
1. Main silencer
2. Middle pipe
3. No. 2 pre-silencer
76G04C-165
4. No. 1 pre-silencer
5. Bracket
6. Front pipe
4C—90
Page 652 of 1865
CONTROL SYSTEM 4C
CONTROL SYSTEM
Throttle sensor
Solenoid Solenoid Idle valve valve switch (VIC) (PRC)
Solenoid
valve
control)*
Solenoid valve
'(No.1 purge control)*1
E/L control unit
Engine control unit
Control relay
Injector
Knock sensor* -
Water thermo
switch*1
"1...Unleaded fuel
*2...Leaded fuel
Oxygen Distributor Water thermo sensor*1 sensor
Clutch switch
Oxygen sensor
relay*1
Solenoid valve
(EGR)*1
/ Solenoid valve 7 (ISC)
Air flow sensor
Neutral switch
76G04C-166
The control system consists of the input devices and the engine control unit. The control unit controls
the fuel injection amount (EGI), fuel injection pressure, bypass air amount, ignition timing, switch moni-
tor function, and fail-safe function.
4C-91
Page 653 of 1865
4C CONTROL SYSTEM
RELATIONSHIP CHART
Output Devices
and
Input Devices (Unleaded fuel)
IGNITION SWITCH
(ON POSION) X X X X X O X X X X X X X X O
TEST CONNECTOR X X X O X X X X X X X X X O X
ELECTRICAL LOAD CONTROL UNIT X X X o X X X X X X X X X X X
P/S PRESSURE SWITCH X X X o X X X X X X X X X X X
A/C SWITCH X X X o X X X X X X X X O X X
IGNITION SWITCH
(STA POSITION) O O X o O X X X X O X X X O X
NEUTRAL
AND
CLUTCH SWITCH O X X o X X X X X X X X X X X
OXYGEN SENSOR o X X X X X X X X X X X X X X
WATER THERMO
SWITCH (RADIATOR) o X X X X X X X o X X X X X X
INTAKE
AIR
THERMO SENSOR X X X X X X X X X O X X X X X
WATER
THERMO SENSOR o X X o X X o o O O X X X O o
IDLE SWITCH o X X o X X X X X o X X X O X
THROTTLE SENSOR o X X X X X X X O X X X X o X
AIR FLOW SENSOR o X X X X X X o X X X X X o O
Ne SIGNAL o o X O o X X O O O o o X o O
G SIGNAL X O X X X X X X X X X X X X X
\
INPUT
DEVICE
OUTPUT
DEVICE
FUEL
INJECTION
AMOUNT FUEL
INJECTION
TIMING
AIR
VALVE
ISC
VALVE
FUEL
PUMP
CONTROL
MAIN
POWER
CONTROL
SOLENOID
VALVE
(No.1
PURGE)
SOLENOID
VALVE
(No.2
PURGE)
SOLENOID
VALVE
(EGR)
SOLENOID
VALVE
(PRESSURE
REGULATOR
CONTROL)
SOLENOID
VALVE
(VARIABLE
INERTIA
CONTROL)
OXYGEN
SENSOR
RELAY
I A/C
RELAY
IGNITER
AIR
FLOW
SENSOR
(BURN-OFF)
\
INPUT
DEVICE
OUTPUT
DEVICE
INJECTOR
BAC
VALVE
CONTROL
RELAY
SOLENOID
VALVE
(No.1
PURGE)
SOLENOID
VALVE
(No.2
PURGE)
SOLENOID
VALVE
(EGR)
SOLENOID
VALVE
(PRESSURE
REGULATOR
CONTROL)
SOLENOID
VALVE
(VARIABLE
INERTIA
CONTROL)
OXYGEN
SENSOR
RELAY
I A/C
RELAY
IGNITER
AIR
FLOW
SENSOR
(BURN-OFF)
76G04C-167
4C—92
