1990 MITSUBISHI SPYDER check engine

ENGINE (TURBO)
INSPECTION PROCEDURE 4
The check engine/malfunction indicator lamp remains
and never goes out.
[Comment]
In cases such as the above, the cause is probably t hat the ECM is detecting a problem in a
sensor or actuator, or that one of the malfunctions listed at right has occurred.
,
P r o b a b l e c a u s e
l c h e c k indicator lamp and ECM
l Malfunction of the ECM
SCAN TOOL
DTCRefer to I N S P E C T I O N C H A R T F O R TROUBLE CODES.
lDisconnect the connector, and measure at the harnes sside.l Disconnect the ECM connector.
l Continuity between 51 and ground
OK: No continuity
OK Check the harness wire between-combination meter an
d
tor. Repair, if necessary.
Replace the ECM.
INSPECTION PROCEDURE 5
Cranks, won’t start Probable cause
[Comment]l Malfunction of the ignition systemIn cases such as the above, the cause is probably t hat the spark plugs are fouled defective, orl Malfunction of the fuel pump systemthat the supply of fuel to the combustion chamber i s defective. Malfunction of the injector systemIn addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.l Malfunction of the ECM
l Foreign materials in fuel
Scan tool: Inspection when no initial combustion oc curs.
(Refer to
INSPECTION PROCEDURE 36.)
OK
Can any sound be heard from (Refer to
Yes
Ignition system: Inspection when no initial combust ion oc-curs. (Refer to INSPECTION PROCEDURE37.)
OK
PROCEDURE FOR DIAGNOSTIC TROUBLE CODES
Check battery positive voltage when cranking.
OK: 8 or hiaher Check the battery. (Refer to GROUP 54 -Battery.)
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check if the injectors are clogged.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the compression pressure.
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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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ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 7
In cases such as the above, the cause is probably that the spark is weak and ignition is difficult,
the initial mixture for starting is not appropriate , or sufficient compression pressure is not being
Probablecause .
Malfunction of the ignition system
l Malfunction of the system Inappropriate gasoline use P o o r
Check battery positive
OK: 8 or higher Check the battery. (Refer to GROUP 54 -Battery)
Scan tool: Inspection when incomplete combustion oc
curs.(Refer to INSPECTION PROCEDURE 38.)
OK
Can any sound be heard
(Refer to
Yes
No
PROCEDURE FOR DIAGNOSTIC TROUBLE CODES .
Check the ignition timing when cranking.
OK:
OK Check that the crankshaft position sensor and
belt cover are
installed
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
l Check if foreign (water, alcohol, etc.) got into fuel.I
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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 Troubleshooting
INSPECTION PROCEDURE 9
speed is high. (Improper idle speed)
[Comment]
In such cases as the above, the cause is probably that the intake air volume during idle is too
great.
YES
Refer to INSPECTION CHART FOR Are diagnostic troublecodesoutputTROUBLE CODES.
Check the idle air control motor for operation sound Engine (Turbo)>. (Refer to Check the idle air control motor for operation sound Engine>. (Refer to
OKCheck the idle control system malfunction (Refer
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
NGSCAN TOOL Data list Check the closed throttle position 26 Closed throttle position switch (Refer to (Refer to INSPECTION PROCEDURE FOR TROUBLE CODE
SCAN TOOL Data listNG Check the engine coolant’ temperature 21 I N S P E C T I O N
P R O C E D U RE
OKTROUBLE CODES
SCAN TOOL Data list
28 A/C switch (Refer to
OK
Adjust the basic idle speed. (Refer to
Check the A/C switch and clutch to INSPECTION PROCEDURE 32.)
Check trouble symptom.
N G
Clean the throttle valve area. (Refer to
Check and the fixed SAS. (Refer to .
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ENGINE (TURBO)
AND
ENGINE> Troubleshooting
INSPECTION PROCEDURE 10
Idle speed is low. (Improper idle speed)“ P r o b a b l e c a u s e , .
[Commentjl Malfunction of the systemIn cases such as the the cause is probably that the intake air volume d uring idling is l of throttle small.
SCAN TOOL DTCYES
Are diagnostic trouble codesoutputRefer to I N S P E C T I O N C H A R T TROUBLE CODES.
NO
Check the idle air control motor for operation soun d Engine (Refer to Check the idle air control motor for operation sound (Refer to
OK
SCAN TOOL Data listNG
26 Closed positionswitch(Refer to
Check the idle control system to INSPECTION PROCEDURE FOR DIAGNOSTIC
,
Check the closed position switch system.(Refer to PROCEDURE FOR T R O U B L E C O D E
SCAN TOOL Data list21 Check the engine coolant temperature circuit malfu nction. (Refer I N S P E C T I O N P R O C E D U R E TROUBLE CODES 15.)
SCAN TOOL Data listNG
29 Park/neutral position switch (Refer toCheck the ignition switch-ST and park/neutral posit ion system.(Refer to INSPECTION PROCEDURE ,
OK
Adjust the basic idle (Refer to
Clean the throttle valve area. to
I
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Check and adjust the fixed SAS. (Refer to
.

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.