MITSUBISHI SPYDER 1990 Service Repair Manual

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.)

E N G I N E ( N O N - T U R B O ) >
INSPECTION PROCEDURE 18
Poor accelerationProbable cause
[Comment]l Malfunction of the ignition systemDefective ignition system, abnormal air-fuel ratio, poor compression pressure, etc. are suspected.lMalfunction of air-fuel ratiol of the fuel supply P o o r a c c e l e r a t i o n
l Clogged exhaust system
SCAN TOOL DTC YES
Are diagnostic trouble codes output
NO
Refer to I N S P E C T I O N C H A R T TROUBLE CODES.
NG Check the injector Carry out procedures 19, 20, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”. ,
Scan tool: inspection when hesitation, sag, stumble or poor
OK
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure. . .
l Check the fuel filter or fuel line for clogging.
l Clogged air cleaner
l Clogged exhaust system
INSPECTION PROCEDURE 19
Surge
[Comment]Defective ignition system, abnormal air-fuel are suspected.
Probable cause
l Malfunction of the ignition system
l Malfunction of air-fuel ratio control system
l Malfunction of the EGR solenoid system
SCAN TOOL DTC
YESRefer to INSPECTION CHART FOR DIAGNOSTIC
Are diagnostic trouble codes outputTROUBLE CODES.
NO
Check the injectors for opNG Check the injector control circuit. Carry out proc edures 21,
(Refer to in “INSPECTION PROCEDURE
OK FOR DIAGNOSTIC TROUBLE CODES”.
Scan Tool: Inspection when surge occurs.
(Refer to INSPECTION PROCEDURE 35.)
OK
Check the fuel pressure. (Refer to I
OK
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the EGR system.
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ENGINE Troubleshooting
INSPECTION PROCEDURE 20
Knocking
[Comment]l Defective knock sensorIn cases such as the above, the cause is probably t hat the detonation control is defective or l
the heat value of the spark plug is inappropriate. Inappropriate value of the
YES
Are
diagnostic troublecodesRefer to INSPECTION CHART FOR DIAGNOSTIC
outputTROUBLE CODES.
NO
SCAN TOOL SENSORNG
09 Knock sensor volts (Refer toCheck the knock sensor circuit (Refer to INSPECTION
PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
Check the following items. l heat ranae
l Check ‘if (water, alcohol, etc.) got into fuel.
Dieseling cause
[Comment]Fuel leakage from injectors is suspected. l
Fuel leakage from injectors
Check the injectors for fuel leakage.
R e v i s i o n

E N G I N E
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
[Comment]Abnormal air-fuel ratio is suspected.
cause
of the air-fuel ratio control system.l Deteriorated catalyst .
SCAN TOOL DTC
Are diagnostic trouble codes output Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
NG
27 Intake air temperature sensor. (Refer to Check the intake air temperature sensor circuit.
( R e f e r t o 3 9 . ) .
N G Check the MAP sensor circuit11MAP sensor reading. (Refer to (Refer to INSPECTION PROCEDURE 40.)IOK
SCAN TOOL SENSOR READ TESTS (Data list)
83 sensor volts (rear) (Refer to l Transaxle gear range l Driving with the throttle wide open
O K :
OK
SCAN TOOL SENSOR READ TESTS (Data list)
02 sensor volts (front) (Refer to OK: 1 when suddenlv
N G Check the heated oxygensensor (rear) circuit.
(Refer to INSPECTION PROCEDURE 41.)
NG
02 sensor volts (front) (Refer to
Check the fuel pressure. (Refer to
OK
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 EGR system.
NG
Check trouble symptom.
N G
Replace the three-way catalytic converter.
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INSPECTION PROCEDURE 23.
Power supply system and ignition ,
[Comment]When an ignition switch turns ON, battery positive voltage is supplied to the PCM.MalfunctionlImproper connector contact, open or short-circuited harness l
Disconnected ground wire
l Malfunction of the
NG
Measure at the PCM connectors
l Disconnect the connector and measureatthe harnessside1. Voltage between 6 and ground (Ignition switch: O N) NG
OK: Battery positive voltage (when the terminal 67 is
grounded)2. Continuity between 47. 50 and ground
OK: Continuity
3. Voltage between 20 and ground OK: Battery positive voltage
Check trouble symptoms.
N G
Check the’ and connector. Repair, if necessary. .
Check the harness wire ground. if necessary.
Check trouble symptoms.
N G
the PCM.
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INSPECTION PROCEDURE 24
Fuel pump system
[Comment], Malfunction of the fuel pump relayThe PCM turns the fuel pump relay ON when the engin e is cranking or running, and this supplies Malfunction of the power to drive the fuel pump. o r
short-circuited harness wire
l Malfunction of the PCM
NGCheck the fuel pump operation.
l Disconnect the fuel pump relay connector.
lUse a jumper wire to apply battery positive voltage to
the relay connector (2). OK: Fuel pump activates.
NGCheck the fuel pump relay.
OK
Check the (Refer to INSPECTION PROCEDURE
Replace
Check the fuel pump drive control circuit. (Refer to
INSPECTION PROCEDURE 37.)

ENGINE ( N O N - T U R B O ) >
INSPECTION PROCEDURE 25
Transaxle range sensor circuit
[Comment]The transaxle range sensor inputs the condition of the selector lever, i.e. whether it is in or range or in some other range, to the PCM.
The PCM controls the idle air control motor based o n this input.Improper connector contact, open circuit
Check the transaxle range sensor. (Refer to GROUP On-vehicle Service.) Replace.
lDisconnect the connector,and measure atthe harness
A-l
OK
Check trouble symptom.
OK
Replace the PCM.
Check harness wire betweenN G
PCM transaxle rangesensor connector.
O K
Replace the PCM.
,
INSPECTION PROCEDURE 26
A/C switch and A/C compressor clutch relay system
motor, and also operates the A/C compressor magneti c clutch.Probable cause
l Malfunction of A/C control l Malfunction of A/C switch Improper connector open short-circuited harness wire
l Malfunction of PCM
NG
OKCheck the A/C compressor clutch relay.
Measure at the PCM
l
(Refer to GROUP 55 On-vehicle Service.)
Disconnect the connector, and measure at the harnes s
Replace
Check the
system. (Refer to GROUP 55
side.lVoltage between 64 and ground, and 38 and ground(Ignition switch: ON)
(A/C switch: ON)
OK: Battery positive voltage
l Connect a jumper wire between 64 and ground.
(Ignition switch: ON)
(A/C switch: ON)
OK: A/C compressor clutch turns ON.
OK1NG RepairA-l 06,A-l 07
OK
Check trouble symptom.
Replace the PCM.
NG
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ENGINE (NON-TURBO)>
INSPECTION PROCEDURE 27
Fan motor relay system (Radiator fan, condenser fan)
[Comment]l Malfunction of fan motor relay
The fan motor relay is controlled by the power tran sistor inside the PCM turning ON and OFF l
Malfunction of fan motor
.improper connector contact, open or
short-circuited wire
l Malfunction of the PCM
Measure at PCM connectors
lDisconnect the connector, and measure at the harnes s RepairA-lA-l 07side.lVoltage between 19 and ground, 55 and ground and
69 and ground (Ignition switch: ON)
OK: Battery positive voltage
lConnect a jumper wire between 19 and ground, and
69 and ground (Ignition switch: ON)
OK:Radiator fan and condenser fan run at high speed.lConnect a jumper wire between 55 and ground (Igniti on
switch: ON).
OK
Check symptom.
1Replace the
OK: Radiator fan runs at low speed.
lCheck the radiator fan circuit (Refer to ELEC-TRICAL WIRING.) (Refer to ELECTRICAL WIRING.)
l Check the A/C condenser fan circuit.
(Refer to ELECTRICAL WIRING.) (Refer to ELECTRICAL WIRING
INSPECTION PROCEDURE 28
Ignition circuit system1
[Comment]
The PCM interrupts the ignition coil primary curren t by turning the ignition power transistor inside
the PCM ON and OFF.
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Malfunction of relay Improper connector contact, circuit Or
short-circuited
l Malfunction of the PCM
NG
Measure at the ignition coil connector Check the following RepairlDisconnect the connector and measure at the harnessside. OK SCAN TOOL Actuator test
relay relay) is turned on and off every 1
[Measure with relay on.]
Check trouble
C h e c k t h e h a r n e s s b e t w e e n relay OK relay) and ignition coil switch Repair, if
Check the harness wire between PCM and ignition coi l
connector. if