MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE (TURBO)
AND ENGINE> Troubleshooting
INSPECTION PROCEDURE 13,
The engine stalls when accelerating. (Pass out)Probable
[Comment]l
Drawing air into intake system
In cases such as the above, the cause is probably m isfiring due to a weak spark, or an M a l f u n c t i o n o f system
air/fuel mixture when the accelerator pedal is depressed.
SCAN TOOL DTCYES
Are diagnostic trouble codes output
N O
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check if air was drawn into the intake system.
Broken intake manifold gasket
Broken or disconnected vacuum hose Refer to
INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
.
Improper operation of the PCV valve
Broken air intake hose
INSPECTION PROCEDURE 14
The engine stalls when decelerating. Probable
[Comment]l
Malfunction of the system.In cases such as the above, the cause is probably t hat the intake air volume is insufficient dueto a defective idle air control motor system.
W ere the battery terminals disconnected recently
NOAfter warming-up, let the engine
at-idling for 10
SCAN TOOL DTC
Are diagnostic trouble codes output? Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
SCAN TOOL Data list
26 Closed throttle position switch (Refer to Check the closed throttle position switch system.(Refer to INSPECTION PROCEDURE FOR TROUBLE CODE
SCAN TOOL Data list 14 Throttle position sensor (Refer to Check the malfunction (Refer to IN- PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Data list YES
45 Idle air control motor position
Engine (Turbo)>
55 Idle air control valve position sensor Engine>lIs the idle speed control motor position drops to steps when decelerating (engine rpm less than 1
Check the vehicle speed sensor malfunction (Refer to PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
N O
Check the following items.’
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the throttle valve area.
l Check and adjust the fixed SAS.
Revision

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> Troubleshootina
INSPECTION PROCEDURE 19
Surge
Defective ignition system, abnormal air-fuel are suspected.
, .
l Malfunction of ignition systeml Malfunction of’ ‘ratio ‘control system l Malfunction of the EGR solenoid system
Are diagnostic trouble codes output
YES ,
Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
.
Check the injectors for opNG
(Refer to PROCEDURE FOR TROUBLE
OK
Check the ignition timing. Engine (Turbo)> Check that the crankshaft position sensor and are properly.(Refer to GROUP On-vehicle Service.)
Check the Engine>
(Refer to GROUP On-vehicle Service.)
Scan Tool: Inspection when surge occurs. (Refer to INSPECTION PROCEDURE 43.)
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
waste actuator.
INSPECTION PROCEDURE 20
Knocking Probable cause
[Comment]l Defective knock sensor ,
In cases such as the above, the cause is probably t hat the detonation control is defective or thel heat the
heat value of the spark plug is inappropriate.. .
YESRefer to INSPECTION CHART FOR’ ‘DIAGNOSTIC Are diagnostic trouble codes output TROUBLE CODES.
NO
NODoes knocking occur when driving with the sensor Check the knock sensor 1 circuit malfunction (Refe r INSPECTION PROCEDURE FOR CODE’At this time, use the scan tool to check if the timing isretarded compared to when the knock sensor connecto ris connected.
YES
Check the following items.
l Spark plugs heat range
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
INSPECTION PROCEDURE 21
DieselingProbableI
[Comment]
Fuel leakage from injectors is suspected.l Fuel leakage from injectors
Check the injectors for fuel leakage.
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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>
INSPECTION PROCEDURE 23
,
Generator output voltage is low (approx.
[Comment]
The cause may be a malfunction of the generator or one of the problems listed at right.l M a l f u n c t i o n o f c h a r g i n g s y s t e m . l Short harness between t e r m i n a l l Malfunction of the ECM.
OK Check the generator.
,
,. . ,
1
Measure at the generator connector l Connect the connector.
l Voltage between and ground
Engine: idle
Radiator fan: stopped
Headlight: off
on
Stop lamp: off on
Check the following
Check the harness wire between generator and ECM co nnector.
Repair, if necessary.
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ENGINE (TURBO)
AND ENGINE> Troubleshoot&j
INSPECTION PROCEDURE 24
Transient, mass emission tailpipe test test failed
[Comment]
The test is failed if the air/fuel ratio is not con trolled to the theoretical air/fuel ratio by means of
the feedback control from the oxygen sensor signal, if the EGR flow volume is insufficient, or if
the catalyst has deteriorated.
Probable cause1
NOTE
If the temperature of the three-way catalyst is low when the exhaust gas is tested, the three-way
cannot effectively clean the exhaust. Accordingly, the engine needs to be sufficiently warmed
the exhaust gas is tested, and the gas should then be tested immediately.
Revision

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.

ENGINE
AND ENGINE> Troubleshooting,
INSPECTION PROCEDURE 25
Purge flow test of the evaporative canister test failed
[Comment]
The test is failed if there is a blockage in the pu rge line or purge port, or a malfunction of the
evaporative emission purge solenoid.l Blocked purge line or purge port emission s o l e n o i d Blocked emission
Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODE.
(Refer to GROUP 17 Emission Control System)
INSPECTION PROCEDURE 26
Pressure test of the evaporative system failedP r o b a b l e
[Comment]
The test is
if there is a leak in the fuel tank or vapor line.lImproper of lBroken seal in fuel tank,emission canister . . .
N GCheck the evaporati Replace,
(Refer to GROUP 17 EmissionControl System)
(Refer to GROUP17 EmissionControl System)
OK
Check the following items.
l Check for leaks from the vapor line and evaporative emission
canister.l Check for leaks from the fuel tank.
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ENGINE (TURBO)
AND ENGINE>
INSPECTION PROCEDURE 27
Power supply system and ignition systemP r o b a b l e
[Comment]l Malfunction of the ignition switchWhen an ignition switch ON signal is input to the E CM, the ECM turns the relay ON. Thisl Malfunction of the relaycauses battery positive voltage to be supplied to t he injectors and volume air flow sensor.Improper connector contact, open or
short-circuited harness wire
l .-Disconnected
wirel Malfunction of the ECM
Check the
relay. (Refer to Replace
OK NG
Measure at the relay connector Check the harness wire battery and lDisconnect the connector, and measure at the harnes sRepair, if necessary.side.l between 3, 4 and aroundOK: Battery positive voltage
OK
Check the ECM power and around circuit. ( R e f e r PR O C E D U R E 4 4 . )
INSPECTION PROCEDURE 28
Fuel pump system Engine (Turbo)>Probable cause
[Comment]l Malfunction of the fuel pump relay The ECM turns the fuel pump relay ON when the engin e is cranking or running, and this M a l f u n c t i o n o f ,
plies power to drive the fuel pump. Improper connector open short-circuited harness wire
l Malfunction of the
Check the fuel pump circuit.
(Refer to I N S P E C T I O N P R O C E D U R E .
Replace
OK .
Check the fuel pump drive control circuit.
Connect the connector. (Refer to INSPECTION PROCEDURE 46.)
l Voltage between 1 and ground
l SCAN TOOL Actuator test: Fuel pump drive
OK:
oositive voltaae
OK
Check the harness wire between fuel pump relay conn ectorand fuel pump drive terminal. Repair, if necessary.
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