compression ratio MITSUBISHI SPYDER 1990 Service Owner's Manual

E N G I N E ( T U R B O ) .
AND ENGINE> ,
Code No. Random Misfire Detected
[Comment]l Ignition system related part(s) BackgroundlIf a misfiring occurs while the engine is running, the engine speed suddenly changes.l
Poor crankshaft sensor l Incorrect air/fuel ratiol The engine control module checks for changes in the engine speed.
l Low compression
Check ArealEngine coolant sensor: l 5 or more have passed after the engine was started. l
liming belt broken
l Engine speed is at between 500 and 6000 l Injector failedl Engine coolant temperature is or higher, l
EGR valve failed
l Intake air temperature is or higherlEngine control 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
orlMisfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.) I,
SCAN TOOL Data list
22 Crankshaft position sensor (Refer to
l Crankshaft position sensor wave form check
l Engine speed: stable
OK: Constant pulse range
OK
position sensor and
Check the injector (Refer toNG Replace
Check the fuel trim malfunction (bank 1) (Refer to IN-SPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
SCAN TOOL list
21 Engine coolant temperature sensor (Refer to
OK
Check the engine coolant temperature circuit malfu nction (Refer
to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE 5.)
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check for broken timing belt teeth.
l Check the EGR system and the EGR valve.
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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)
ENGINE>
INSPECTION PROCEDURE 6
Fires up and dies.Probable cause .
[Comment] Malfunction of system
In such cases as the above, the cause is probably that the spark plugs are generating sparksl Malfunction of the injector systembut the sparks are weak, or the initial mixture for starting is not appropriate. Foreign materials in fuel P o o r Malfunction of the ECM .
Check battery positive voltage wh
OK: 8 or higher
OK
Check the battery. (Refer to GROUP
Scan tool: Inspection when incomplete combustion oc curs.(Refer to INSPECTION PROCEDURE 38.)
OK
Yes
INSPECTION
PROCEDURE FOR DIAGNOSTIC TROUBLE
,
Is starting good if the engine Yes.
pedal depressed?
No
Check idle air control motor for operation sound. Check the idle control malfunction (Refer toEngine (Refer to
(Check idle air control motorfor operation sound (Refer to
INSPECTION
TROUBLE
Clean the valve
(Refer to
l Check and adjust the
Check the ignition timing when cranking.
OK:
OK
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
Check if the injectors are clogged. Check the compression pressure.
l Check fuel lines for clogging.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
,
Check that the crankshaft position sensor and
belt cover are
installed property.
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E N G I N E ( T U R B O )
AND ENGINE>
INSPECTION PROCEDURE 8
Unstable Rough
[Comment]
In cases such as the above, the cause is probably t hat the ignition system, air/fuel mixture, idle
air control motor or compression pressure is defect ive.
Because the range of possible causes is broad, insp ection is narrowed down to simple items.
W ere the battery terminals disconnected recently
NOAfter warming-up, let the
for minutes.’ ,
SCAN TOOL DTC YES
Are diagnostic trouble codes output Refer to INSPECTION FORDIAGNOSTICT R O U B L E C O D E S .
Does idle speed fluctuate excessively
NO(Refer to INSPECTION 39.)
Check the idle air control motor for operation soun d
control motor for operation sound engine>. (ReferNG .
Probable cause ,
Malfunction of the ignition of system
l M a l f u n c t i o n s y s t e ml Malfunction of the evaporative purge system-
l Poor compression
l Drawing air
exhaust system
Check the idle control system malfunction (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLECODE
ChecktheinjectorforoperationI .
PROCEDURE FOR DIAGNOSTIC TROUBLE-CODES
Scan tool: Inspection when idle speed is unstable.
(Refer to INSPECTION PROCEDURE 40.)
Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing. Engine>
(Refer to GROUP On-vehicle
Check that the crankshaft position sensor and timi ng belt cover are
installed properly.
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OK
SCAN TOOL Actuator test 10 EGR solenoid (Refer to NG.
OK
Check the exhaust gas recirculation solenoid malfun ction.(Refer to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the purge control System.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the EGR system.

ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 11
When the engine is cold, it stalls at idle. (Die out)P r o b a b l e c a u s e .
[Comment]l Malfunction of the system
In such cases as the above, the cause is probably t hat the mixture is inappropriate whenl the bodythe engine is cold, or that the intake air volume is insufficient.l Malfunction of the injector system Malfunction of the s y s t e m
W ere the battery terminals disconnected recently
NO
After warming-up, let the engine run at idling for 10 minutes.
SCAN TOOL DTC
Are diagnostic trouble codesoutput?Refer to INSPECTION CHART FOR TROUBLE CODES.
(Refer to Check and adjust the (Refer to ,
NO
Is engine-idling stable after the warming-up
YES(Refer to INSPECTION PROCEDURE
Check the idle air control motor for operation soun d NG
Engine (Turbo)>. (Refer to Check the idle air control motor for operation sound (Refer to
Checktheinjectorforope
OK
Check the idle control system malfunction to .INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
PROCEDURE FOR DIAGNOSTIC TROUBLE CODES
SCAN TOOL Data list Check the closed position switch system.
26 Closed throttle position switch (Refer to INSPECTION PROCEDURE FOR
OKTROUBLE CODES
SCAN TOOL Data listN G Check the engine coolant temperature circuit malfu nction. (Refer to21 Enginecoolanttemperaturesensor P. I N S P E C T I O N P R O C E D U R E F O R TROUBLE CODES
Check the fuel pressure. (Refer to I
Check the ignition timing. Engine Check that the position sensor and belt cover are
(Refer to GROUP
(Refer to GROUP Check the ignition timing. Engine>
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check the engine oil viscosity.
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 12.
When the engine is hot, it stalls at idle. (Die out)Probable cause
l Malfunction of the ignition system In cases such as the above, the cause is probably t hat ignition system, air/fuel mixture, idle airl Malfunction control systemcontrol motor or compression pressure is defective.l M a l f u n c t i o n o f system In addition, if the engine suddenly stalls, the cau se may also be a defective connector contact.l Drawing air into intake system
l I m p r o p e r c o n n e c t o r c o n t a c t
W ere the battery terminals disconnected recently After warming-up, let the engine run at idling for minutes.
NO
SCAN TOOL DTC
Are diagnostic trouble codes output?YESRefer to I N S P E C T I O N C H A R T TROUBLE CODES.
Check the idle air controlEngine (Refer Check the idle control system malfunction (Refer to
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
Check the idle air control motor for operation soun d
(Refer to
Checktheinjectorforoperati
OKPROCEDURE FOR DIAGNOSTIC ,
I
Does the engine stall N O While carrying out an intermittent malfunction sim
ulation test (Refer
YESto GROUP 00 How to Cope with Intermittent Malfunctions, check
for sudden changes in the signals shown below.
Scan tool: Inspection when engine stalls when the e nginel Crankshaft position sensor Primary is warm and idling INSPECTION signal signal
CEDURE 41.) Volumeairflowsensorsignal l
Fuel pump drive signal
OK l
Injector drive signal l ECM power supply voltage
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Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing. Engine>
(Refer to GROUP On-vehicle Service.)
Check that the crankshaft position sensor and timin g belt cover are
installed properly.
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check if the injectors are clogged.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.

ENGINE (TURBO)
AND ENGINE> T r o u b l e s h o o t i n g
INSPECTION PROCEDURE 15
Hesitation, sag or stumbleProbable
[Comment]Malfunction of the ignition system
In cases such as the above, the cause is probably t hat ignition system, air/fuel or l of pressure is defective. of the fuel l Malfunction of the system Poor compression Malfunction of the turbocharger,
Arediagnostic trouble codesoutput
Check the injectors for operationsound.(Refer to
OK
Refer to INSPECTION FOR DIAGNOSTICTROUBLE CODES.. .
Check the injector circuit malfunction PROCEDURE FOR DIAGNOSTIC
Check the ignition timing. Engine (Turbo)>
(Refer to GROUP On-vehicle Service.)
Check the ignition timing.
(Refer to GROUP 11 On-vehicle Service.)
Check that the crankshaft position and cover installed properly.
OK
Scan Tool: Inspection when hesitation, sag, stumble or pooracceleration occurs. (Refer to INSPECTION
PROCEDURE 42.)
IOK
Check the fuel pressure. (Refer to
O K
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check supercharging pressure.
l Check intake charge pressure control system.
l Check rotating resistance of turbocharger turbine w heel. (Does the wheel rotate smoothly?)
Check the EGR system.l Check the compression pressure.lCheck the fuel filter or fuel line for clogging.
INSPECTION PROCEDURE 16
Acceleration shock
[Comment]
In cases such as the above, the cause is probably t hat there is an ignition leak accompanying
the increase in the spark plug demand voltage durin g acceleration.
Probable cause
M a l f u n c t i o n system
SCAN TOOL DTC
Are diagnostic trouble codes output
NORefer to
INSPECTION CHART FOR DIAGNOSTIC
T R O U B L E C O D E S .
,
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check for occurrence of ignition leak.
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ENGINE (TURBO)
AND
ENGINE> Troubleshooting
INSPECTION PROCEDURE 17
Probable causeI
[Comment]l Malfunction of the system
Malfunction of the system is suspected.
Are diagnostic trouble codes output
YESRefer to INSPECTION FOR DIAGNOSTICTROUBLE CODES.
Check theidle air control motor for operation sound Engine (Refer to Check the idle air control motor for operation soun d Engine>. (Refer to
SCAN TOOL Data list
14 Throttle position sensor (Refer to
OK
Check the idle control system malfunction (Refer t o INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
Check the throttle position circuit malfunction (Refer to PROCEDURE FOR DIAGNOSTIC TROUBLE 20.)
NG,
SCAN TOOL Data list Check closed position switch system.
26 Closed throttle position switch (Refer to (Refer to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE .
. .
Clean the throttle valve area. (Refer to
INSPECTION PROCEDURE 18
Poor acceleration Probable cause I
[Comment]
Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc. are l Malfunction of the Ignition system Malfunction of air-fuel ratio control l Malfunction of the fuel supply system Poor acceleration
l C l o g g e d e x h a u s t s y s t e m
l Malfunction ‘of turbocharger system .
SCAN TOOL DTC
Are diagnostic trouble codes output
YESRefer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
Check the injectors for opNG
(Refer to PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
Check the ignition timing. Engine (Turbo)>
(Refer to GROUP A On-vehicle Service.)
Check the ignition timing. Engine>
Check that the crankshaft position sensor and timi ng belt cover are
installed
(Refer to GROUP On-vehicle Service.)
OK
Scan tool: Inspection when hesitation. stumble or poor acceleration occur. (Refer to INSPECTIONPROCEDURE 42.)I
OK
Check the fuel pressure. (Refer to
OK
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check supercharging pressure.
l Check intake charge pressure control system.
l Check rotating resistance of turbocharger turbine w heel. (Does the wheel rotate smoothly?)
l Check the compression pressure.
lCheck the fuel filter or fuel for clogging.
l Broken air intake hose
Clogged air cleaner
l Clogged exhaust system
Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
[Comment]Malfunction of the ratio
Abnormal air-fuel ratio is suspected.
SCAN TOOL Are diagnostic trouble codes output
N O
YES Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
Check the ignition timing. Engine (Turbo)>NG
(Refer to GROUP On-vehicle Service.) Check that the crankshaft position sensor and belt installedCheck the ignition timing. Engine>(Refer to GROUP 11 On-vehicle Service.)
OK
NGSCAN TOOL Data list
21 Engine coolant temperature sensor. Check the engine coolant temperature malfunction. (Refer to
(Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODES
OK
SCAN TOOL Data listNG Check the intake air temperature (Refer to
13 Intake air temperature sensor (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC
OK TROUBLE CODE
SCAN TOOL Data list
25 Barometric pressure sensor (Refer to
OK
Check the pressure circuit malfunction. INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Data listNGCheck the oxygen sensor circuit malfunction (bank sensor 2). (Refer59 Heated oxygen sensor (rear) (Refer to to INSPECTION PROCEDURE FOR DIAGNOSTIC
l Transaxle gear TROUBLE CODE ranae l Driving with the throttle wide open
O K :
OK
SCAN TOOL Data list NG
Heated oxygen sensor (front) (Refer to OK: 1,000 when racing suddenly
OK
SCAN TOOL Data list11 Heated oxygen sensor (front) (Refer to O K : and
Check the oxygen sensor circuit malfunction (bank 1 sensor 1). INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE
alternately when idling.
NG
Check the fuel pressure. (Refer to
Check the following items.
l Check the injectors for operation sound.
l Check the injectors for fuel leakage.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check the positive crankcase ventilation system.
l Check the evaporative emission control system.
l Check the
system.I
Check trouble symptom.
Replace the three-way converter.
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
Has the engine warmed up sufficiently when the exhaust gas is
tested? (Check with owner.)Let the engine warm up sufficiently before testing the exhaust gas.
,
l Check all vacuum hoses and connectors.
l Check electrical wires and connectors for obvious p roblems.
l Check the exhaust system for missing Repair
No
Check the ignition timing Engine (Turbo)>.
Check the ignition timing Engine>.
(Refer to GROUP
Refer to INSPECTION CHART TROUBLE CODE.
NG Check that the crankshaft position sensor and timi ng belt cover
are properly.
SCAN TOOL list
21 Engine coolant temperature sensor
(Refer to P.
Check the engine coolant temperature sensor circui t malfunction.
OK
NGCheck the intake air temperature sensor circuit mal function. (Referto INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE
25 Barometric pressure sensor (Refer to
IOK
NG Check the barometric pressure sensor circuit (Refer
to INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE
, N G
SCAN TOOL Data list Check the oxygen sensor circuit malfunction (bank 1 sensor 2).
59 Heated oxygen sensor (rear)’ (Refer to
l Transaxle: gear range TIC TROUBLE CODE l Drive with wide open throttleO K : 6 0 0 1 0 0 0
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OKNGSCAN TOOL Data list Check the oxygen sensor circuit malfunction (bank 1 sensor 1).
11 Heated oxygen sensor (front) (Refer to
OK: 600 1000 when racing suddenly TIC TROUBLE CODE
OK
OK
SCAN TOOL Data list Check the EGR system. (Refer to GROUP 17 Emission Control11 Heated oxygen sensor (front) (Refer to System)OK: 0 400 and 600 1000 alternately when idling
and 2500 OKNGMeasure the CO
Check the fuel pressure. (Refer to
sensor
l Check the injector for fuel leakages.
Check troub symptom. l Check the injectors for operation sound.
l Check the
spark plugs, spark plug cables.l Check the compression pressure. Replace the three-way catalytic converter.
l Check the positive crankcase ventilation system.
l Check the evaporative emission control system.