ECU MITSUBISHI SPYDER 1990 Service Owner's Manual

ENGINE (TURBO)
ENGINE>
Code No. Misfire Detected (Cylin-
der-l,
[Comment]Background
lif a misfiring occurs while the engine is running, the engine speed suddenly changes.
l The engine control module checks for changes in the engine speed.
Check Areal 5 or more have passed after the engine was started.l Engine speed is at between 500 and 6000 l Engine coolant temperature is or higher.
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
l Running free from sudden accelerations/deceleration s such as shift change.
Judgement Criteria(change in the angular acceleration of the crankshaft is used for misfire detection.)lMisfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than
or l Misfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.)
l l Low compression l Injector failed
l Engine
Check the injector (Refer
OK
Replace
Check the following connectors: __ Repair,OK
[Check the harness wire between the ECM and the inj ectorNG ,
connector
Check the following items.
l Check the spark plugs, spark plug cables.
l Check the compression pressure
Code No. Knock Sensor 1 Circuit Malfunction
Engine (Turbo)>
l sensor failed BackgroundlThe knock sensor converts the vibration of the cyli nder block into a voltage and outputs
it. If there is a malfunction of the knock sensor, the voltage output will not change.
l The engine control module checks whether the voltag e output changes.
Check Areal Ignition switch: ONl60 or more have passed after the ignition switch was turned on or the starting sequencewasl Engine speed is higher than 2000
Judgement CriterialKnock sensor output voltage (knock sensor peak volt age in each deg period of the
crankshaft) has not changed more than 0.06 in the last consecutive 200 periods.
lOpen or shorted knock sensor circuit, or connector
l Engine control module failed
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Evaporative Emission
Pressure Sensor Malfunction Engine>
[Comment]Background
lThe fuel tank differential pressure sensor outputs the voltage in proportion to the pressurein the fuel tank. (differential pressure against the barometric pressure)
l The engine control module checks whether the output voltage of the fuel tank differential
pressure sensor is within the specified range
Check Area, Judgement Criteria 1. Check Area
l Engine speed is not lower than 1500
l Volumetric efficiency is between 25
Judgement Criterial
The sensor output voltage is 4.5 or higher for 10 seconds even though the intake
air temperature is between 5” and the evaporative emission
purge solenoid is being driven at 100% duty.
or
l The sensor output voltage is 0.5
or lower for 10 seconds even though the intake
air temperature is (41 or higher and the evaporative emission purge solen oid
is not being driven.
2. Check Area l The pressure fluctuates 20 times or more at 0.2
or higher.
l Closed position switch: ON
Judgement Criterial
The pressure fluctuates 20 times or more (0.2 or higher) for 15 consecutive idleoperations.
Fuel tank differential pressure Openor shorted fuel o r Engine control module ,
.
Disconnect the connector and measure at the harness side.
2. Continuity between 2 and ground OK: Continuity
OK
NGCheck the following Repair
NGNGCheck the harness Repair
between fuel tank differ-
ential
sensor and
Replace the fuel tank differential pressure sensor.
NGNGCheck the harness wire
between fuel tank differ-
/ Check
Check the harness wire between fuel tank differenti al pressure
sensor and ground. Repair, if necessary.
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
TerminalCheck itemCheck condition (Engine condition) c o n d i t i o n
No.
Engine>
Terminal
No.
Engine
41 41Generator Terminall Engine: idle after warm-up (radia-
tor fan: OFF)
l Headlight: OFF ONl switch: OFF l Stop lamp: OFF ON
A/C refrigerant A/C refrigerant1 , 3 7 3
ate pressure switch
pressurepsi) or less
pressure side)
1,863 (270
psi) or more
Engine/transaxle general
control torque reduction
request signal 2 Engine: Idle
During driving and
after engine warming up
Engine: Idle
Turn the A/C
,
switch OFF
switch ON (A/C
compressor is
operating)
Engine: Idle at the coolant b - l
ture of or lower
Engine: Warm, idle
Engine: Warm, idle
Engine: 5,000
the at a constant speed
Engine: 3,000
Warm, idle
Engine: 5,000
Engine: Idle
I
Engine: CrankingIor more
Ignition switch:
ON When intake air
t e m p e r a t u r e i s
When intake air 2.3-2.9
t e m p e r a t u r e i s
When intake air
temperature is
When intake air
t e m p e r a t u r e i s
.
42
4343
A/C switch45
46Engine/transaxle general
control torque execution
signal
Heated oxygen
heater (Rear)
55Evaporative emission
ventilation solenoid
58Engine ignition signal
Heated oxygen sensor
heater (Front)
60
61Fuel tank differential pres-
sure sensor
71Ignition switch-ST
Intake air temperature
sensor
‘272
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FIXED SAS ADJUSTMENT
NOTE
1. The fixed SAS should not be moved unnecessarily;it has been precisely adjusted by the manufacturer.
2 .
If the adjustment is disturbed for any reason, read just
as follows.
1. Loosen the tension of the accelerator cable suff iciently.
2. Back out the fixed SAS lock nut.
3.Turn the fixed SAS counterclockwise until it is suf ficiently
backed out, and fully close the throttle valve.
4. Turn the fixed SAS clockwise until the throttle lever is
touched (i.e., the point at which the throttle valve begins
to open).
From that point, turn the fixed SAS clockwise anoth er
t u r n .
5.While holding the fixed SAS so that it doesn’t move , tighten
the lock nut securely.
6. Adjust the tension of the accelerator cable.
7. Adjust the basic idle speed.
8.Adjust the closed throttle position switch and the throttle
position sensor. (Refer to

COOLANT SENSOR
Caution
Be careful not to touch the tool against the
(resin section) when and
1.Remove engine coolant temperature sensor from the in-,
take manifold.
2.With temperature sensing portion of engine tem-
perature sensor immersed in hot water, check resist ance.
,
Temperature
(32)
20 (66)
40 (104)
60 (176)
Resistance
2.1-2.7
3.If the resistance deviates from the standard value greatly,
replace the sensor.
4. Apply sealant threaded-‘portion. ,
Specified sealant:
NUT locking Part No. 4171 or equivalent,
5. Install engine coolant temperature sensor
it to specified torque.
Sensor tightening torque: 30 Nm (22
6. Fasten harness connectors securely.

FUEL SUPPLY Fuel Tank
FUEL GAUGE UNIT AND PUMP ASSEMBLY
REPLACEMENT
(1) Remove the rear seat cushion. (Refer to, GROUP
Seat.)
(2) Remove the protector.
(3) Disconnect the hoses and connectors to remove the fuel
pump assembly or fuel gauge unit.
(4) Align the packing positioning projections with. the
in the fuel pump assembly.
(1) Remove the rear seat cushion. (Refer to GROUP
Seat.)
(2) Remove the protector.
(3) Bleed the residual pressure inside fuel
to prevent the fuel from spraying’
(Refer to GROUP On-vehicle Service.)
(4) Disconnect the hose and connector ‘connections, ’ and
then remove the fuel
and pump assembly
(5)
or the fuel gauge unit and pipe
Check to be surethat the fuel tank packing damaged
or deformed, and then securely install the packing.
NOTE
If the packing is damaged or deformed? replace with new
packing.
(6) Apply soapy water to the inside of the packing, and “then
install the fuel gauge unit and pump assembly the
fuel gauge unit and pipe assembly..
.Caution
Do not tilt the fuel gauge unit pump
or the fuel gauge and pipe assembly when
installing.
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AND CONTROL
Input Inspection Table
.
Code No.Input operation Operation
21SET switch ONAuto-cruise control-ECU judges that SET switch is O
N
22RESUME switch ON Auto-cruisecontrol-ECU judges that ON
23 Stop light switch
(ON when brake pedal depressed) Auto-cruise control-ECU judges that stop light swit
ch is ON
24
25
26Auto-cruise control-ECU judges that vehicle speed i s 40
km/h (25 mph) or higher ,Vehicle speed signal
Auto-cruise control-ECU judges that speed is lower
than 40 km/h (25 mph)
lClutch pedal position switch Auto-cruise control-ECU judges that clutch (ON when clutch pedal depressed) Park/neutral position switch switch or park/neutral position ONl(ON when selector lever in range)
27 CANCEL switch ON Auto-cruise control-ECU judges that
ON
28 Throttle position sensor signal Auto-cruise control-ECU judges that throttle
voltage is 1.5 or more
29Closed throttle position switch,Auto-cruise control-ECU judges
switch is OFF
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES,
Code No.
On-board diagnostic items page
11Auto-cruise vacuum pump drive system
12
14
15
Vehicle speed signal system
Auto-cruise vacuum pump power supply system
Auto-cruise control switch
17-21
.
16
17
Auto-cruise control-ECU
Throttle position sensor system
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E N G I N E A N D E M I S S I O N C O N T R O L Auto-cruise
INSPECTION PROCEDURE: FOR DIAGNOSTIC TROUBLE CODES
Code Auto-cruise vacuum pump drive system
[Comment]
This diagnostic trouble code is output if the release valve, control valve and motor drive signals
from the auto-cruise vacuum pump are not input to t he auto-cruise control-ECU.
(Refer to
l Malfunction of the auto-cruise vacuum pump
l Malfunction of the auto-cruise control-ECU
Measure at
control-ECU
connector
lDisconnect the connector and mea-sure at the harness side.
lVoltage between terminal (12) andground (for driving release valve)lVoltage between terminal (13) andground (for driving control valve)
lVoltage between terminal (26) andground (for driving motor)
OK: Battery positive voltage
Measure at auto-cruise vacuum pump
connector Stop light switch check
I
(Refer to l sure at the harness side.
l Voltage between terminal andgroundOK: Battery positive voltage
OK
auto-cruise control main switch and
auto-cruise vacuum pump. Repair, if
N G
and
OK
Check trouble symptom.
following
OK
Check trouble symptom.
NG
Replace the control-ECU.
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C h e c k t h e b e t w e e n t h eauto-cruisev a c u u m p u m p a n d
auto-cruise control-ECU. Repair, if
necessary.

ENGINE AND EMISSION CONTROL Auto-cruise Control’
Code 2 Vehicle speed signal system
[Comment]l Malfunction of the vehicle This diagnostic trouble code is output if the vehic le speed signals from the vehicle speed sensor l of connectorare not input to the auto-cruise control-ECU when t he vehicle speed is 40 km/h (25 mph) l
Malfunction of the harness
or more. l Malfunction of the auto-cruise
Check the vehicle speed sen(Refer to GROUP 54 CombinationMeter.)
1. NG
Measure at the vehicle speed sensor connector Check the following connector. l Disconnect the connector, and measure at the
harness side.O K
1. Voltage between 1 and ground (Ignition switch: ON)
NG
System voltage
2.Voltage between 3 and ground2. N G(Ignition switch: ON)
OK: 4.6 5.2 3.Continuity between 2 and ground3. N G
OK: Continuity
OK
Check trouble symptom.
N G
Check the harness between the speed sensor
Check the following
OKNG
Check trouble symptom.
NG
Check the harness between the auto-cruise ECU and the vehicle soeed sensor connector.
OKNG
Replace the auto-cruise control-ECU.
and ignition switch connector
OK
Check the ignition switch.
(Refer to GROUP 54 , ,
Check the harness between the vehicle speed sensorand the ground. Repair, if necessary.
Code Autocruise vacuum pump power supply systemProbable cause
[Comment]
This code will be output when the drive signals for the auto-cruise vacuum pump release valve,
control valve and motor are not input to the auto-c ruise control-ECU.l
the stop light l
Malfunction of the connector
l
l of the auto-cruise
at the auto-cruise vacuum
l Disconnect the connector and
l Voltage between terminal (1) and
OKN G Check the harness between the cruise vacuum pump and the cruise control-ECU.
and
Replace the auto-cruise control-ECU.
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17-22ENGINE AND EMISSION CONTROL Auto-cruise Control System
Code Auto-cruise switch Probable cause
l Malfunction of the auto-cruise control switch
This diagnostic trouble code is output if the RESUME switch or SET switch remains ON.
Replace the auto-cruise control
Code 6 Auto-cruise control-ECU Probable cause
[Comment]l Malfunction of the auto-cruise control-ECU
This diagnostic trouble code is output if there is an abnormality in the CANCEL hold circuit
or the microprocessor monitor circuit in the auto-c ruise control-ECU.
Replace the auto-cruise
Code Throttle position sensor system Probable cause
[Comment]l
Malfunction of the throttle position sensor
This diagnostic trouble code is output if a voltage of 1.5 or more when the closed throffle l
Malfunction of the connectorposition switch is ON or 0.2 or less when the closed throttle position switch i s OFF is outputlMalfunction of the harness
for a continuous period of 4 seconds or more. l
Malfunction of the auto-cruise control-ECU
trouble code No. 14 outputfrom the powertrain control module?
OK
Check troubleNGsympl Inspect the harness between the position sensor and cruise control-ECU
OK
Revision
Replace the auto-cruise control-ECU.