1990 MITSUBISHI SPYDER check oil

ENGINE Troubleshooting .
Scan tool 138
Code General scan tool
No. Not
25
[Comment]Range of Check
l Engine:
l Vehicle at rest and the brake appliedSet Conditionl speed differs from target idle by 200 for 12 seconds. l
Idle air control motor failed
l motor related circuit .
SCAN TOOL SENSOR READ TESTS (Data list)
12 position (Refer to Check the air control motor. (Refer to
OK
Check the throttle body minimum air flow. (Refer to
Code
No. R e l a y
General scan tool High Speed Radiator Fan Control
[Comment]
Background
lThe high speed radiator fan relay controls the high speed operation of the radiator fan.lOne side of the relay control coil is supplied with 12 volts when the switch is
turned to the ON position.
lThe circuit is completed when the other side of the relay coil is grounded by the PCM.lThe PCM grounds the relay control circuit depending on engine coolant temperature and/or A/C compressor condition, etc.
Range of Check
l Battery voltage: 10
or more
l Ignition switch: ON
Set Condition
lAn open or shorted condition is detected in the hig h speed radiator fan relay control circuitfor 3 seconds.
Probable cause
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l Relay open or l Ignition switch output lLow speed radiator fan relay control circuit
open or shorted
NGMeasure at the PCM connector Check the radiator fan circuit.lDisconnect the connector, and measure at harness side. Voltage between 69 and ground(Ignition switch: ON),.
OK: Battery positive voltage .,
l
Connect a jumper wire between 69 and ground(Ignition switch: ON)
OK: Radiator fan runs at high speed.
OK
Check the following connector: N G Repair
OK
Check trouble symptom.1
NG
Replace the PCM.

ENGINE Troubleshooting
INSPECTION PROCEDURE 4
The check engine/malfunction indicator lamp remains
illuminated and never goes out.
[Comment]In cases such as the above, the cause is probably t hat the PCM is
detecting a problem in a sensor or actuator, or tha t one of the malfunctions listed at right has
occurred.
Probable cause
l Short-circuit between the check indicator lamp and l Malfunction of the PCM
SCAN TOOL DTC Refer to
INSPECTION CHART FOR DIAGNOSTIC
Are diagnostic trouble codesoutput? TROUBLE CODES
Measure at the combination meter connector lDisconnect the connector, and measure at the harnes s
side.Check the harness wire between meter and PCM
connector. Repair, if necessary.
l Disconnect the PCM connector.
l Continuity between 51 and ground
OK: No continuity
O K
Replace the PCM.
INSPECTION PROCEDURE 5
Cranks, won’t start Probable cause
[Comment]l Malfunction of the ignition system
In cases such as the above, the cause is probably t hat a spark plugs are fouled defective,l Malfunction of the fuel pump system
or that the supply of fuel to the combustion chambe r is defective.
l Malfunction of the injector system
in addition, foreign materials (water, kerosene, et c.) may be mixed with the fuel.
l Malfunction of the PCM
l Foreign materials in fuel
,
Check battery positiv
OK: 8 or hiaher Check the battery. (Refer to GROUP 54 Battery)
OK
Scan tool: Inspection when no initial combustion oc
curs.
(Refer to INSPECTION PROCEDURE 29.)
OK
Can any sound be heard
.
(Refer to
Yes
Check ignition circuit system.
(Refer to INSPECTION PROCEDURE 28.)
OK
Check the injector control circuit. Carry out proce dures 19, 20, 21, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.,
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the compression pressure.
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ENGINE (NON-TURBO)=,
INSPECTION PROCEDURE 6
Fires up and dies.P r o b a b l e
[Comment]l of the ignition system
In such cases as the above, the cause is probably t hat the spark plugs are generating sparkslbut the sparks are weak, or the initial mixture for starting is not appropriate.Malfunction of the injector system
l Foreign fuel
l Poor compression
l
of the PCM
Check the battery. (Refer to GROUP 54
OK:8 or higher
Scan tool: Inspection when incomplete combustion oc curs.(Refer to INSPECTION PROCEDURE 30.)
OK
Canany sound be heard (Refer to
Yes
Check the injector control circuit. Carry out procedures in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.
Is starting good if the engine is cranked with the acceleratorpedal slightly depressed?
No
motor circuit INSPECTION
PROCEDURE FOR
TROUBLECODE
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check the compression pressure.
l Check fuel lines for
l Check if foreign (water, alcohol, etc.) got into fuel.
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INSPECTION PROCEDURE 7
Hard startingIProbable cause I
[Comment]l Malfunction of the ignition systemIn cases such as the above, the cause is probably t hat the spark is weak and ignition is difficult,lMalfunction of the injector system
the initial mixture for starting is not appropriate , or sufficient compression pressure is not beinglInappropriate gasoline useobtained.l P o o r
Check battery positive vo
OK: 8 or higherOK
Scan tool: Inspection when incomplete combustion oc curs.
(Refer to INSPECTION PROCEDURE 30.)Check the battery. (Refer to GROUP 54
Battery)1
Can any sound be heard fro
No Check the injector control circuit. Carry out proc
edures 19, 20, 21,
(Refer to in “INSPECTION PROCEDURE
YesFOR DIAGNOSTIC TROUBLE CODES”.
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the
l Check the pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.

ENGINE (NON-TURBO)> Troubleshooting
INSPECTION PROCEDURE 8
Unstable idle (Rough idle, hunting)Probable cause
[Comment] Malfunction of the ignition system
In cases such as the above, the cause is probably t hat the ignition system,l Malfunction of air-fuel ratio system
idle air control motor or compression pressure is d efective.
l Malfunction of the system
Because the range of possible causes is broad, insp ection is narrowed down to simple items.
l Malfunction of the evaporative emission
purge solenoid system
l Malfunction of the EGR system
l Poor compression
l Drawing air into exhaust system
W ere the battery terminals disconnected recently?
SCAN TOOL DTC
Are diagnostic trouble codes output
NO Refer to
INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
YES
Inspection when hunting occurs.
(Refer to INSPECTION PROCEDURE 31.)
SCANTOOL Actuator test
07 motor (Refer to
OK
NG Check the idle air control motor (Refer to P. INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Specialfunction
“Reset
I
Check trouble symptoms.
OK
Scan tool: Inspection when idle speed is unstable. (Refer
to INSPECTION PROCEDURE 32.)
OK
Check the injector control circuit: (Carry out pro cedures 19, 20, 21, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.)
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the purge control system.
l Check the EGR svstem.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
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ENGINE,
INSPECTION PROCEDURE 11When the engine is cold, it stalls at idle. (Die ou t)
[Comment]lMalfunction of the idle air control
In such cases as the above, the cause is probably t hat the air/fuel mixture is inappropriate when l Malfunction of the fhroffle body the engine is cold, or that the intake air volume i s insufficient..l Malfunction of the injector System l Malfunction: system
W ere the battery terminals disconnected recently?
NO
SCAN TOOL DTC
.After warming-up, let the engine run at idling for 10 minutes.I
,
Are diagnostic trouble codes output?TROUBLE CODES
N OI -.: .
Does the engine stall right after the accelerator p
edal is
Check the throffle body minimum air (Refer to released
NO . . . N O Check for unstable idle (Rough hunting)Is engine-idling stable after the warming-up?
YES(Refer to INSPECTION 8.)
SCAN TOOL Actuator test
07 motor (Refer to
OK NG
Check the idle air control motor circuit. (Refer t
o INSPECTION PROCEDURE FOR TROUBLE CODE
SCAN TOOL Special function
“Reset
Check trouble symptoms.
NG
OK
.
Check the injector control circuit. Carry procedures 19, in “INSPECTION PROCEDUREFOR DIAGNOSTIC TROUBLE
Check the fuel pressure. (Refer to
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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E N G I N E
INSPECTION PROCEDURE 12 , .
. .
When the engine is hot, it stalls at idle. (Die out )
[Comment]l Malfunction of the ignition In cases such as the above, the cause is probably t hat ignition system, mixture, idle l
air control motor or compression pressure is defect ive.Malfunction control M a l f u n c t i o n o f t h e s y s t e m In addition, if the engine stalls, the cause
mayalso be a defective connector contact.l into intake system
l Improper connector contact
W ere the battery terminals disconnected recently
NO
YES After warming-up, let the engine run at idling for 10 minutes.
SCAN TOOL DTC
Are diagnostic trouble codes output?
NO
SCAN TOOL Actuator test
07 motor. (Refer to
OK YES
N G
Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
Checktheidleaircontrolmotorcircuit. INSPECTIONPROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Special function
“Reset
Check trouble symptoms.
NG
Check the injector for operation sound.
(Refer to Check the injector control circuit. Carry out proc edures 20, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.
Does the engine stall right
released
NO.
Does the engine stall easily again
YES
Scan tool: Inspection when engine stalls when the e ngine
is warm and idling (Refer to INSPECTIONPROCEDURE 33.)
OK
Check the throttle body minimum air flow (Refer to
While carrying out an intermittent malfunction simulation test (Refer
to GROUP 00 How to Cope with Intermittent Malfunctions), check
for sudden changes in the signals shown below.
l Crankshaft position sensor and
l MAP sensor signal Fuel pump signall Injector drive signal l power supply voltage
Check the following items.
l
Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
INSPECTION PROCEDURE 13
The engine stalls when accelerating. (Pass out) Probable cause
[Comment]l
Injectors failedIn cases such as the above, the cause is probably m isfiring due to a weak spark, or an inappropriatelMalfunction of the ignition system
air/fuel mixture when the accelerator is depressed.
YESRefer to INSPECTION CHART FORDIAGNOSTIC
Arediagnostic trouble codes outputTROUBLE CODES.
NO
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clogged injectors

ENGINE (NON-TURBO)>
INSPECTION PROCEDURE 14. .. .
The engine stalls when decelerating.P r o b a b l e c a u s e
[Comment]In cases such as the above, the cause is probably t
hat the intake air volume is insufficient due
to a defective idle air control motor system. l Malfunction of the system
W ere the battery terminals disconnected recently?YES After warming-up, let the engine run at idling for
SCAN TOOL DTC
Are diagnostic trouble codes output?
OK
Refer to I N S P E C T I O N FOR TROUBLE CODES.. .
SCAN TOOL SENSOR07 Throttle position (Refer to
NO
NGCheck the throttle position sensor circuit.
(Refer to INSPECTION PROCEDURE 43.)
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the throttle body minimum air flow.
INSPECTION PROCEDURE 15
Hesitation, sag or stumble
[Comment]In cases such as the above, the cause is probably t hat ignition system, air/fuel mixture or
compression pressure is defective.
Probable cause
Malfunction of the ignition Malfunction of air-fuel ratio control l Malfunction of the fuel supply l of the EGR. solenoid l P o o r
Are diagnostic trouble
codes output
Check the injectors for opNG
(Refer to Check the injector control circuit. out procedures 20, 21, in’ INSPECTION PROCEDUREFOR DIAGNOSTIC TROUBLE CODES”.
Scan Tool: Inspection when hesitation, sag, stumble or pooracceleration occur. (Refer to INSPECTIONPROCEDURE 34.)
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 the EGR system.
l Check the compression pressure.
l Check the fuel filter or fuel line for clogging.
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E N G I N E
INSPECTION PROCEDURE 16 . ,
Acceleration shock ,
[Comment] Malfunction of the ignition systemIn cases such as the above, the cause is probably that there is an ignition leak accompanyinglthe increase in the spark plug demand voltage durin g acceleration.Improper control of reduction stiifting.
Are diagnostic trouble codes output
NO YES
Refer to INSPECTION CHART D I A G N O S T I CTROUBLE CODES.
Check the following items.
l
Check the ignition coil, spark plugs, spark plug ca bles.
l Check for occurrence of ignition leak.
l Check the torque reduction link (wire) between the PCM and TCM.
INSPECTION PROCEDURE 17
Deceleration shock Probable cause
[Comment]Malfunction of the system is suspected.l Malfunction of ‘system
III
Are diagnostic trouble codes output
NO
YESR e f e r t o C H A R T F O R TROUBLE CODES.
SCAN TOOL Actuator test
07 motor. (Refer to PROCEDURE FOR DIAGNOSTIC TROUBLE CODES
SCAN TOOL Special function“Reset
Check trouble I
N G
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Check the throttle body minimum air flow.
(Refer to
SCAN TOOL SENS
07 Throttle position (Refer to NGl Check the throttle position sensor
(Refer to INSPECTION PROCEDURE 43.)