MITSUBISHI SPYDER 1990 Service Repair Manual

FUEL
INJECTION
CONTENTS
FUEL INJECTION (MFI)
ENGINE (NON-TURBO)> . . . . . . . 3
Relay (ASD Relay) and Fuel ‘Relay
Check.. . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . .128
Throttle Position Sensor Check. . . . . . . . . . .
129
GENERAL INFORMATION . . . . . . . . . . . . . . . . 3ON-VEHICLE SERVICE. . . . . . . . . . . . . . . .119
INJECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . .134Fuel Pressure Test . . . . . . . . . . . , . . . . . . . . .121
ON-VEHICLE INSPECTION OF
COMPONENTS . . . . . . . . . . . . . . . . . . . . . .
Component Location. . . . . . . . . . . . . . . . . . . 124
Electric EGR Transducer Solenoid Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . .133
Engine Coolant Temperature Sensor Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
Evaporative Emission Purge Solenoid
C h e c k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 3
Heated Oxygen Sensor Check . . . . . . . . . . . 13 0
Idle Air Control Motor (Stepper Motor)
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Injector Check . . . . . . . . . . . . . . . . . . . . . . . . . .132
Intake Air Temperature Sensor Check . . . . 128 Fuel Pump Connector Disconnection
(How to Reduce Fuel Line Pressure) . . . . . 123
Throttle Body Minimum Air
Check . . . 110 ,
SEALANT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS . . . . . . . . . . . . . . 6
SPECIAL TOOLS . . . . . . . . . . . . . . .
. . . . . 7,
THROTTLE BODY . . . . . . . . . . . . . . . . .
TROUBLESHOOTING. . . . . . . . . . . . . . . . 6
CONTINUED ON NEXT PAGE

MULTIPORT FUEL INJECTION (MFI)
(TURBO) AND’ EN-
GINE> . . . . . . . . . . . . . . . .
.. . . . . . . . . . .
FUEL RELAY MODULE
ENGINE> . . . . . . . . . . . . . . . . . . . . . . .
GENERAL INFORMATION. . . . . . . ... . . . . . . .136
INJECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . .269
ON-VEHICLE INSPECTION OF
COMPONENTS. . . . . . . . . . . . . . . . . . . . . . .
Closed Throttle Position Check . . . .282
Component Location. . . . . . . . . . . . . . . . . . . .272
EGR Solenoid Check . . . . . . . . . . . . . . . . . . . .288
Engine Coolant Temperature Sensor
Check... . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
281
Evaporative Emission Purge Solenoid
Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .288
Fuel Pressure Solenoid Check
Engine (Turbo)> . . . . . . . . . . . . . . . . . .287
Heated Oxygen Sensor Check . . . . . . . . . . .283
Idle Air Control Motor (DC Motor) Check
Engine> . . . . . . . . . . . . . . . . . . . . . . . . . .287
Idle Air Control Motor (Stepper Motor)
Check
Engine (Turbo)> . . . . . . . . . . . .285
Injector Check. . . . . . . . . . . . . . . . . . . . . . . . . . .283
Intake Air Temperature Sensor Check . . . .280
Fuel Injection (MFI)
Relay and Fuel Pump Relay Check . . . . . .
280
Resistor Check Engine (Turbo)>. . . . 285
Throttle Position Sensor
. . . . . . . 282
Turbocharger Waste Gate, Check.. . . . . . . . . . . . . . . . . . . . . . . . . .288
ON-VEHICLE. . . . . . . . .
Basic Idle ‘Speed . . . . . . . 266
Closed Throttle
Position Sensor Adjustment . . . . . . . . . . . . . . 263
Curb Idle Speed Inspection
Engine (Turbo)
. . . , . . . .
. . . . . . .
Refer to GROUP
Refer to GROUP
Fixed SAS Adjustment . . . . . .
Fuel Pressure Test . 268
Fuel Pump Connector
(How to Reduce Fuel
Fuel Pump Operation Check . . . . . . 271
Throttle Body (Throttle Valve Area)
Cleaning. . . . , . . . . . . . . . , . . 262
SEALANT.144
SERVICE SPECIFICATIONS . . . . . . . .
SPECIAL . . . . . . . . . . . . . . . 145
BODY. . . . . . . . . . . . . . 291
. . . . . . . . . . . . . . . .

ENGINE (NON-TURBO)> General
FUEL INJECTION
ENGINE (NON-TURBO)>
GENERAL INFORMATION
The Fuel Injection System consists
of sensors which detect the engine conditions,
the POWERTRAIN CONTROL MODULE(PCM) which controls the system based on
signals from these sensors, and actuators
which operate under the control of the PCM.
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 condi-
tions.
A single injector is mounted at the intake port
of each cylinder. Fuel is sent under pressure
from the fuel tank by the fuel pump, with the
pressure regulated by the fuel pressureregulator. 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
This
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 PCM drives the idle air control (IAC) motor
to keep the engine running at the idle
target speed in accordance with the engine
IGNITION TIMING CONTROL
The ignition power transistor is built into the
PCM. It turns the ignition primary circuit on
and off to respectively supply and cut off primary
current flow to the ignition coil. The PCM carries
activities such fuel
injection control, idle air control and ignition
timing control.
In addition, the
diagnostict e s twhich simplify
troubleshooting when a problem develops.
is called The PCM
air/fuel mixture by carrying out “open-loop”
control when the engine is cold or operating
under high load conditions in to maintain
engine performance.
In addition, when the engine warm or
operating under normal
the PCM
controls the air/fuel mixture by using the heated
oxygen sensor signal to carry out “closed-loop”
control in order to obtain the theoretical air/fuel
mixture ratio that provides the maximum
cleaning
from the three way
catalyst.
coolant temperature and air conditioning load.
In addition, when the air conditioning switch
is turned off and on while the engine is idling,
the
motor operates to adjust the throttle
valve bypass air amount in accordance with
the engine load conditions in order to avoid
fluctuations in the engine speed.
This controls the ignition timing in order to
provide the optimum ignition timing with respect
to the engine operating conditions. The ignition
timing is determined by the PCM from the
engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
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ENGINE (NON-TURBO)>
DIAGNOSTIC TEST MODE
l When an abnormality is detected in one
of the sensors or actuators related to
emission control, the CHECK
MALFUNCTION INDICATOR LAMP
nates as a warning to the driver.
l When an abnormality is detected in one
of the sensors or actuators, a diagnostic
OTHER CONTROL FUNCTIONS
t r o u b l e c o d e
a b n o r m a l i t y i s o u t p u t .
lThe RAM data inside the PCM that is
to the sensors and
by means of the scan tool.
In addition, the actuators can be controlled
under certain circumstances. . ,
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 A/C compressor clutch 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
Controls the generator in order
to control the generated current.
5. Engine Speedometer or Tachometer
Control.
Sends a pulse signal which ‘corresponds
to the engine speed to the’ speedometer
unit..
6. Evaporative Emission Purge
C o n t r o l
Refer to GROUP 17.
7. Electric EGR Transducer Solenoid Control Refer to GROUP 17.
Throttle body
Sensors
Actuators
Specifications
Throttle bore mm (in) 52 (2.05)
Throttle position sensor Variable resistor type
Idle air control motor
Stepper motor type [Stepper type
bypass air control system]’,
Manifold absolute pressure sensor Semiconductor type
Intake air temperature sensorT h e r m i s t o r t y p e
Engine coolant temperature sensorThermistor type .
Heated oxygen sensorZircon type .
Vehicle speed sensorElectromagnetic resistance element type
TCM output signal
Camshaft position sensor Hall element type’
Crankshaft position sensor
Hall element type
Knock sensor Piezoelectric type
Power steering pressure switch Contact switch type
fuel injection (MFI) relay (ASD relay)
Contact switch type
Fuel pump relay Contact switch type
Injector type and number Electromagnetic type, 4
Electric EGR transducer solenoid ON/OFF type solenoid valve
Evaporative emission purge solenoid Duty cycle type solenoid valve
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ENGINE (NON-TURBO)>
MULTIPORT FUEL INJECTION SYSTEM
Heated oxygen sensor Power supply(Front)l Vehicle speed sensor
Manifold absolute l switch
sure sensor l position Intake air temperature
switch (transaxle rangesensor switch) position sensor Power pressure Camshaft position sensor Crankshaft position sen- l ignitionsor sense) Engine coolant tempera- l Brake switch
ture sensor relay r e l a y ) Knock sensor Heated oxygen sensor(Rear)
Injector l
F u e l Evaporative l fuel purge solenoid Idle air control motor EET
“Evaporative emission l
.l Fan motor l Generator speedometer
light
.
Fuel
canister
absolute pressure sensor
Intake air temperature sensor
Positive crankcase
ventilation valve
I n j e c t o r
transducer
sensor
Engine coolant
Knock sensor
Crankshaft position sensor
Air inlet
Heated oxygen
sensor (Rear)
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Service ENGINE (NON-TURBO)> Sealants
SERVICE SPECIFICATIONS
Ignition timing
Curb idle
Idle speed when is ON
Standard value
BTDC. at curb idle (Nonadjustable)-
800 100
850 in Neutral
Throttle position sensor resistance,
Idle air control motor coil resistance
Intake air temperature sensor resistance
Engine coolant temperature sensor
Heated oxygen sensor output voltage
Fuel pressure (psi)
Injector coil resistance
Electric EGR transducer solenoid coil resistance
3 . 5 8 . 5 ,
9 - 1 1
0.6 0.8
9-11 ,
0.6 0.8
0.6
1.0
330
350 (47 50) at curb idle
25 35 (68
SEALANTS
Items
Engine coolant temperature sensor threaded portion
Intake air temperature sensor threaded portion
,Specified sealants
Loctite 24200 or equivalent.
Loctite 24200 or equivalent
.
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ENGINE (NON-TURBO)> ,
SPECIAL TOOLS
Scan tool
Interface
Fuel pressure gaugeUse with
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ENGINE (NON-TURBO)> Troubleshooting
TROUBLESHOOTING
DIAGNOSTIC TROUBLESHOOTING FLOW
Gather information fromcustomer.
Verify complaint
Reoccurs
Read the diagnostic trouble code (Refer to
I
Does not reoccur.
.
Read the diagnostic trouble code (Refer to
I
Diagnostic trouble trouble
Recheck trouble symptom.
Refer to the INSPECTION CHART FOR DIAGNOSTIC
TROUBLE CODES (Refer to How to Cope with
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ENGINE (NON-TURBO)>
TEST MODE
CHECK ENGINE/MALFUNCTION INDICATOR LAMP
As a functional test, the Malfunction Indicator Lam p
illuminates at key-on before engine cranking.
Whenever the Power-train Control Module (PCM) sets a
diagnostic trouble code that effects vehicle emissi ons, it
illuminates the
The PCM illuminates the for
diagnostic trouble codes that effect vehicle emissi ons. The
remains on until the diagnostic trouble code is erased.
The
either flashes or illuminates continuously when
PCM detects active engine misfire.
During active misfire, thePCM records the
operating conditions. The engine operating conditio ns
recorded by the PCM.
ItemsIndicated by the Check Engine/Malfunction Indicator Lamp
DTC No. Items
01No cam signal at PCM
02Internal controller failure
EGR solenoid circuit
EVAP solenoid circuit
Injector control circuit
20Injector control circuit
21Injector control circuit
25Idle air control motor circuit
26Throttle position sensor voltage low
27Throttle position sensor voltage high
30Engine coolant temperature voltage too low
31Engine coolant temperature voltage too high
32Upstream stays at center
35
No vehicle speed sensor signal
36
07) MAP sensor voltage too low
37MAP sensor voltage too high
39No change in MAP from start to run
42Ignition coil primary circuit
43Ignition coil primary circuit
46
EGR system failure
57Intake air temperature sensor voltage low
58Intake air temperature sensor voltage high
61Injector control circuit
62Upstream shorted to voltage
68PCM failure communications
71 temperature volts out of limit
, .
,
92 (PI 490)
93
101
33)
103
Low speed fan control relay circuit
High speed fan control relay circuit
Fuel pump relay control circuit
Upstream
response
Upstream
heater failure
Downstream
heater failure
Multiple cylinder misfire
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ENGINE (NON-TURBO)> Troubleshooting
DTC No. ItemsI
107
108
109
110
112
113
114
118
119
126 38)
Cylinder misfire
Cylinder
misfire
Cylinder
misfire
misfire
Catalytic
efficiency failure
EVAP purge flow monitor failure
Park/neutral position switch (transaxle range switc h) failure
Fuel system rich
Fuel system lean
Downstream
shorted to
128Closed loop temperature not reached
129
Downstream at center
132
133
TPS voltage does not agree with MAP
Timing belt skipped 1 tooth or more
135No 5 volts to MAP sensor
136No 5 volts to throttle position sensor
137EATX controller DTC present
138Taraet idle not reached
High speed radiator fan control relay
146 1496)
153
154
155
156
157
160
161
183
5 volts too low
Battery temperature sensor voltage too low
Battery temperature sensor voltage too high
Upstream
voltage grounded
Downstream
voltage grounded
Intermittent loss of CMP or CKP
EVAP leak monitor small leak detected
EVAP leak monitor large leak detected
Evaporative emission ventilation solenoid circuit
Evaporative emission ventilation solenoid switch or mechanical fault
EVAP leak monitor pinched hose found
NOTE
Following a detected malfunction of the Control Module (PCM), the check engine lamp
up the next time the engine is turned on if the mal function is still detected. However, for items
with an asterisk in the table above, the check engine lamp goes on’ the first time a malfundin is
detected.
Once the check engine lamp is lit, any one of the f ollowing
will turn it off.
lWhen the PCMhas found no malfunction after monitoring the power train times time
is from engine start to engine stop).
lA misfire of fuel abnormality when engine speed, coolant temperature, etc. are to those
when the malfunction was first recorded, and the PCM has detected no malfunction.
Caution
If the check engine lamp is turned on by a malfunct ion of the PCM, the scan tool communicate
with the PCM, and the diagnostic trouble code canno t be read.
,
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