fuel pressure MITSUBISHI ECLIPSE 1991 Workshop Manual

FUEL SYSTEM - MPI Svstem InsDection <2.0L DOHC Engine>
outputDiagnosis codeIreferenceDragnosrs ItemCheck item (Remedy)orderOutput signal patternNo.Memory
7Crank angle sensor
:nn **
Retainedl Harness and connector
(If harness and connector
are normal, replace crank
angle sensor assembly.)
12A0107
8Top dead center
:- 23
Retainedl Harness and connectorsensor (No.1 and(If harness and connector
No. 4 cylinder)are normal, replace crank
angle sensor assembly.)
12A0107
9Vehicle speed sensor24Retainedl Harness and connector
(reed swatch)H
I u I nlvln
l Vehicle speed sensor
(reed switch)
L12A0107
10Barometnc pressure25Retainedl Harness and connector
sensorH(If harness and connector
are normal, replace
LULllnMllbarometric pressure
12A0107sensor assembly.)
11Detonation sensorRetainedl Harness and connector
:m 31
l Detonation sensor
12R0468
12Injector
:m 41
Retainedl Harness and connector0 Injector coil resistance
12A0105
13Fuel pump42Retainedl Harness and connectorH
UUUI nn
0 Control relay
L12A0105
14EGR 43Retainedl Harness and connector
Hl EGR temperature sensor
u u u I nnn
l EGRvalvel EGR valve control sole-Lnoid valve
12A0105l EGR valve control vacuum
15Ignition coil44Retainedl Harness and connectorH
UUUL-llMlL
0 Ignition coil0 Power transistor
L12A0105
16Normal state---H
L
12A0104
NOTEReplace the engine control unit if a malfunction code is output although the inspection reveals that there is no problem with the check
items.

FUEL SYSTEM - MPI System Inspection <2.0L QOHC Engine>14-79EGR TEMPERATURE SENSOR
N14RCHAaRefer to GROUP 25
- Exhaust Gas Recirculation System.
VEHICLE SPEED SENSOR
Refer to GROUP 8
- Meters and Gauges.
N140EBBaAIR CONDITIONER SWITCH
Nl4QQAEaRefer to GROUP 8
- Column Switch.
POWER STEERING OIL PRESSURE SWITCH
N14RCJBRefer to GROUP 19 for power steering system inspection.
INJECTORS
NWXAHCHECKING OPERATION SOUND
Using a sound-scope, check the operation sound (“chi-chi-chi”)of the injectors during idling or during cranking.
Check to be sure that the operation sound increases when the
engine speed is increased.
Caution
Note that the sounds of other injectors may be heard even
though the injector being checked is not operating, so caremust be taken when checking.
NOTEIf the operation sounds cannot be heard, check the injector
activation circuit.
If this circuit is normal, there is probably a malfunction of the
injector or of the engine control unit.
MEASURING OF RESISTANCE BETWEEN TERMINALS
(1) Disconnect the connector for the injectors.
(2) Measure the resistance between terminals.
Standard value:
13
-16 S2 [at 20°C (68”F)]2
- 3 52 [at 20% (68”F)]
(3) Connect the connector for the injectors.
IDLE SPEED CONTROL SERVO
N14QUADCHECKING OPERATING SOUND
(1) Check that when the ignition switch is placed in the ON
position (the engine not started), the operating sound of thestepper motor can be heard over the idle speed control
servo.
(2) If no operating sound can be heard, check the stepper
motor drive circuit.
(If the circuit is good, a defective stepper motor or engine
control unit is suspected.)

14-82FUEL SYSTEM - MPI System Inspection <2.0L DOHC Engine>
\ \\I \3FUO352
,\ \
\I \3FUO353
,\ ‘\R/
\ \\I \3FUo354
POWER TRANSISTORRefer to GROUP 8
- Ignition System
NlIAcQAl
a-4
AIR CONDITIONER POWER RELAYN14NCl.a -Refer to GROUP 24
- Air Conditioner.
PURGE CONTROL SOLENOID VALVEN14RCKARefer to GROUP 25
- Evaporative Emission Control System.
EGR CONTROL SOLENOID VALVE
N14NCURefer to GROUP 25
- Exhaust Gas Recirculation System.
FUEL PRESSURE CONTROL VALVE
OPERATIONAL CHECK
NOTEBefore the vacuum hoses are removed, make a mark’on the
-
hose for visual identification so that they can be reconnected in,their original positions.
(1) Remove the vacuum hoses (blue stripes and black) from
the solenoid valve.
(2) Disconnect the harness connector.
(3) Apply vacuum with a hand vacuum pump to the nipple to
which the black vacuum hose was connected and check for
air tightness both when a voltage is applied to the solenoidvalve terminal and when the voltage is removed.
Battery voltageOther nipple of
solenoid valveNormal condition
When voltage
is removed
When voltage
is applied
OpenVacuum leaks
Blocked by fingerVacuum is retained
OpenVacuum is retainedCHECKING
COIL RESISTANCE
Measure the coil resistance with a tester.
Standard resistance: 36
- 46 R [at 20°C (68”F)]

INJECTORFUEL SYSTEM
- Injector14-83
* ‘- REMOVAL AND INSTALLATIONNWSA-A
Post-installation Operation
l Measurement of Fuel Pressure(Refer to P.14-44. 52.)
4.8L Engine><2.0L DOHC
Engilme>11R7-11 Nm
-hl ft.lbs.-zF!
;533i5,b;m-. .-Y-71s4-6 Nma-3-4 ft.lbs.
03AOlSS::,
4*12:
Center cover
Connection for control harness
Delivery pipe
d-- -13. Insulator4-6 Nm
3-4
ft.lbs.
lo-13 Nm
7-9 ft.lbs.Removal steps
1. Connection for breather hose
2. Connection for PCV hose
+e *+3. Connection for high pressure fuel hose
4. O-ring
5. Connection for vacuum hose6. Connection for fuel return hose
l + 7. Fuel pressure regulator8. O-ring
9. Accelerator cable clamp
03AO19014. Insulator
** l + 15. InjectorH 16. O-ringl + 17. Grommet
!PTkeverse the rem&al procedures to reinstall.(2) +* : Refer to “Service Points of Removal”.
(3) l * : Refer to “Service Points of Installatron”(4) m : Non-reusable parts

14-84FUEL SYSTEM - Injector
03*0095
Delivery pipe03A0095-SERVICE POINTS OF REMOVAL
H4s0m1‘~
3.DISCONNECTION OF THE HIGH PRESSURE FlJFL HOSE /;;
Bleed the residual pressure within the fuel pipe line’& as to~prevent the flow of fuel.
For information concerning the method to be folfowed for
bleeding the residual pressure, refer to
P.14-44.Caution
Cover the hose connection with rags to prevent splash,
of fuel that could be caused by some residual pressure
in the fuel pipe line.
12. REMOVAL OF DELIVERY PIPE/ 15. INJECTOR
Remove the deliver-y pipe (with the injectors attached to it).Caution
Care must be taken, when removing the delivery pipe,
not to drop the injector.
INSPEiZTION
INJECTORS
N14NGAA
(1) Measure resistance between terminals of injector using a
circuit tester.+-%Standard value:
/13-1652 [at
20°C (68”F)] <1.8L Engine, 2.0L DOHC
Engine
(NoniTurbo)>
2-3Q [at 20°C (68”F)] <2.0L DOHC Engine (Turbo)>
(2) If the resistance is out of specification, replace the injector.
SERVICE POINTS OF INSTALLATION
N14SDAEl’17. INSTALLATION OF
GROMMET/lG. 0-RINGI15. IN-
JECTOR
(I) After installation of the grommet and O-ring (in that
sequence) to the injector, apply light oil or petrol to the
O-ring.(2) While turning the injector to.the left and right, install it
to the delivery pipe.
(3) Check to be sure that the injector turns smoothly.
Caution
If it does not turn smoothly, the O-ring may be
~trapped remove the injector and then re-insert it
into the delivery pipe and check once again.
L

FUEL SYSTEM - Injector/Throttle Body <1.8L Engine>14-85
Delivery pipe
Fuel pres
regulator
O-ringY pipe
O-kg
OWOO797. INSTALLATION OF FUEL PRESSURE REGULATOR
When connecting the fuel-pressure regulator to the deliv-
ery pipe, apply light oil or petrol to the O-ring, and then
insert, being careful not to damage the O-ring.
3. CONNECTION OF THE HIGH PRESSURE FUEL HOSE
When connecting the high pressure fuel hose to the
delivery pipe, apply petrol to the hose union, and then
insert, being careful not to damage the O-ring.
THROTTLE BODY 4.8L Engine>REMOVAL AND INSTALLATION
Removal steps
l 41. Connection for accelerator cable2. Connection for breather hose
3. Connection for air intake hose
4. Connection for vacuum hose
5. Connection for
ISC motor connector
6. Connection for TPS connector7. Connection for MPS connector
8. Connection for water hose
9. Connection for water by-pass hose
10. Throttle bodyl 4 11. Gasket
03AO277
NOTE(1) Reverse the removal procedures to reinstall.(2) I)+ : Refer to “Service Points of Installation”.(3) m : Non-reusable parts

FUEL SYSTEM - Fuel Tank
FUEL TANK cFWD>
,*. REMOVAL AND INSTALLATION
q?&g
NlMA-30-40 Nm
2-3 Nm22-29 ft.lbs.
---15-20 Nm
11-14 ft.lbs.
15-22 ft.lbs.Removal steps
l + 1. Return hosel +2. Vapor hose
3. Clamp
4. Fuel gauge unit connector
5. Electrical fuel pump connector
l + l q6. High pressure fuel hose
l + 7. Filler hose
l + 8. Vapor hose
~~ 9. Self-locking nut10. Tank band11. Fuel tank
l + 12. Vapor hosel + 13. Overfill limiter (Two-way valve)I)+ 14. Fuel gauge unitl + 15. Electrical fuel pump16. Drain plug
17. Fuel tank cap
18. Packing
19. Fuel filler neck$TEeverse the removal procedures to reinstall,(2) +e : Refer to “Service Points of Removal”:,,
(3) *+ : Refer to “Service Points of lnstallatlon .(4) m : Non-reusable parts

14-94FUEL SYSTEM - Fuel Tank
Outlet side_ Inlet side01
W838
Positioning projection
03A0220SERVICE POINTS OF REMOVALtilirro8AH
6. DISCONNECTION OF HIGH PRESSURE FUEL
H;OSECaution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
INSPECTIONN14GCAll Check the hoses and the pipes for crack or damage.
l Check the fuel tank cap for malfunction.
l Check the fuel tank for deformation, corrosion or crack.
0,. Check the fuel tank for dust or foreign material.
NOTE
If the inside of the fuel tank is to be cleaned, use any one ofthe following:
(1) Kerosene
(2)
Trichloroethylene-(3) A neutral emulsion type detergent
OVERFILL LIMITER (TWO-WAY VALVE)
Set a hand vacuum pump at inlet side or outlet side; the valve
is good if, when a negative pressure (vacuum) is applied, air
flows after a slight negative pressure is initially maintained.
SERVICE POINTS OF INSTALLATION.
Nl4DDAL15. INSTALLATION OF ELECTRICAL FUEL PUMP
(1) Align the three positioning projections of the packing
with the holes in the fuel pump.
(2) When the fuel pump is installed, the holding bolt at the
lower side of the fuel tank should be installed first.
Care should be taken at this time that the O-ring is not
pinched.14. INSTALLATION OF FUEL GAUGE UNIT
Align the two positioning projections of the packing with
the holes in the fuel gauge unit.
Caution
When mounting the fuel gauge unit, incline the float at
the end leftward, and insert it into the fuel tank. Since
the reserver cap is provided in the fuel tank, the fuel
gauge unit will contact the reserver cap if the fuel
gauge unit is inclined rightward during insertion.
-
4
-,

FUEL SYSTEM- Fuel Tank
Flare nut
Se&e side 03~043
03FOO76. CONNECTION OF HIGH PRESSURE FUEL HOSE TO
FUEL PUMP
Temporarily tighten the flare nut by hand, and then tighten
;Jtit to the specified torque, being careful that the high
’pressure fuel hose does not become twisted.
Caution
When tightening flare nut, be careful not to bend or
twist line to prevent damage to fuel pump low
connection.2. CONNECTION OF VAPOR HOSE/l. RETURN HOSE
When attaching the fuel hose to the pipe, be sure that the
hose is attached as shown in the illustration.
Standard value:
25-30 mm (1 .O-1.2 in.)

FUEL SYSTEM - Fuel Tank
FUEL TANK
i. REMOVAL AND INSTALLATION
N140A-A
_-Pre-removal Operation
eDraining of the fuel.@Release of Residual Pressure from High
Pressure Fuel Hose(Refer to
P.14-44.)Post-installation Operation
*Measurement of Fuel Pressure(Refer to P.14-44, 52.)l .Supplving of the Fuel.
1-2 Nm825-35 Nm
‘*-*: ft-‘bs*
9-14 Nm- 7-10 ft.lbs.-9
-7
03AO262
15-20 Nm
11-14 ftlbs.Removal steps
1. Fuel tankcap2. Packing
3. Drain plug4. Return hose
5. Vapor hose
4*6. High pressure fuel hose
7. Fuel filler hose
8. Cable band9. Protector
10. Vapor pipe11. Vapor hose
l 4 12. Hole cover13. Self-locking nut
14. Fuel tank
15. Overfill limiter (Two-way valve)
l + 16. Fuel pump and fuel gauge unit assembly
17. Fuel filler neck
FyTEeverse the removal procedures to reinstall.(2) ~~ : Refer to “Service Points of RemoveI”.(3) l + : Refer to “Service Points of Installation”.(4) m : Non-reusable parts