check engine MITSUBISHI SPYDER 1990 Service Repair Manual

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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ENGINE (TURBO)
AND ENGINE>
INSPECTION PROCEDURE 29 ,
Fuel pump system Engine>
[Comment]l of the fuel pump The ECM judges the engine (Low, Middle, High), and outputs the result of this judgement tol Malfunction fuel the fuel pump relay module. The fuel pump relay mod ule controls the operation of the fuel pump
in accordance with the engine which is input from the ECM. When the engine is high, Malfunction, of the fuel pump moduleImproper connector contact, open orthe fuel pump operates at high speed, and when the engine is low, the fuel pump operates
short-circuited harness at low speed.l Malfunction of the ECM,,
Check the fuel pump
OK
Measure at the fuel pump relay connector l Connect the connector.
l Voltage between 1 and ground switch: ON)
OK: Battery positive voltage Check the fuel pump drive
circuit 46.)
NG Repair lDisconnect the connector and measure at the harness
side.connector.. . 1. Voltage between 1 and ground (Ignition switch: O N)OK: Battery positive voltage2. Continuity between 5 and ground
OK: Continuity
OK
Check trouble ,
3. 2 and ground (Engine: Cranking)
4.
the terminal to the terminal 3
negative the terminal 4.
OK: Fuel pump operates.
U K
Check the following NG Repairc o n n e c t o r .
OK
Check trouble symptom
N G
Replace the fuel pump relay module
Check the harness wire between the fuel pump relay module con-nector and fuel pump relayconnector and repair if necessary.
Check the harness wire between the fuel pump relay con-nector and around and if
Check the following Repairconnector.
Check trouble
NG
Replace the ECMI
- - - Check the following Repairconnectors.
OK
Check trouble symptom.
Replace the fuel pump
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ENGINE (TURBO)
AND ENGINE>,
INSPECTION PROCEDURE 30
Ignition switch-ST system
[Comment]l Malfunction, of ignition switch ,
The ignition switch ST inputs a HIGH signal to the while the engine is cranking.Improper connector
The ECM controls fuel injection, etc. during starti ng based on this input. . l t h e .
Measure at the ECM connector lDisconnect the connector, and measure at the harnes s
side.
1. Voltage between 71 and ground (Ignition switch: START)
OK: or more
2. Continuity between 91 and ground OK: Continuity
OK
R e p a i r
Check trouble symptom.
Replace the ECM. 1. NG
2. NG
. . .,
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ENGINE (TURBO)
AND ENGINE>
INSPECTION PROCEDURE 31Ignition switch-ST and park/neutral position
system
[Comment]
l The ignition switch ST inputs a HIGH signal to the ECM while the engin e is cranking.
The ECM controls fuel injection, etc. during starti ng based on this input.
l The park/neutral position switch inputs the conditi on of the select lever, i.e. whether it is
in
or range or in some other range, to the The ECM controls the idle air control motor based o n this input.l
Malfunction of
switch park/neutral switchImproper connector contact, open circuit or
shortcircuited harness wire
l Malfunction of the
I , .
,
.Check the park/neutral position switch. (Refer to G ROUP Replace On-vehicle Service.)
park/neutral position switchand ignition switch connector.
OK
Check the ignition switch. (Refer to GROUP 54 Switch.)
1. NG
Measure at the position switch connector
lDisconnect the connector, and measure at the harnes s2. NGOKside.Voltage between 8 and ground Engine (Turbo)>(Ignition switch: ON) Check trouble symptom.ING . ,
Voltage between 5 and ground Engine>(Ignition switch: ON) NGOK: Battery positive voltage 3. NGCheck harness wire between
2. Continuity between 7 and ground ECM and park/neutral Engine (Turbo)>tion switch connector.
Continuity between 8 and ground Engine>OK
OK: Continuity3.Voltage between 8 and ground Engine Replace the ECM.
Voltage between 5 and ground
l Ignition switch: START
l Disconnect ECM connector.Check harness wire between park/neutral OK: Battery positive voltage and starter terminal. Repair, if necessary.
OK, ,
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E N G I N E
AND ‘ENGINE> Troubleshooting
INSPECTION PROCEDURE 32
switch and compressor clutch relay system, . .
(Comment]l Malfunction of control When an A/C ON signal is input to the the ECM carries out control of the idle air control Malfunction of motor, and also operates the compressor magnetic clutch.lImproper connector open circuit or harness .
NG
(Refer toGROUP55 On-vehicleService.) Replace
OK
Measure at the ECM connectors lDisconnect the connector, and measure at the harness
lVoltage between 22 and ground, and 45 and ground
(Ignition switch: ON)
(A/C switch: ON)
OK: Battery positive voltage
l Shortcircuit between 22 and ground
(Ignition switch: ON)
switch: ON)
OK: compressor clutch turns ON.
OK
N G
OK
Check trouble symptom.
the
NG
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ENGINE (TURBO)
AND
INSPECTION PROCEDURE 33
Fan motor relay system (Radiator fan, A/C condenser fan)Probable cause
[Comment]l Malfunction of fan motor relay
The fan motor relay is controlled by the power tran sistor inside the ECM turning ON and OFF.l Malfunction of fan motorImproper connector open shortclrcuitedl Malfunction of the ECM
Disconnect the connector, and measure at the harnes s
Voltage between 20 and ground, and 21 and ground
l Shortcircuit between 20 and ground (Ignition switch :
Check the Repair
O K
Check trouble symptom.
OK: Radiator fan and condenser fan rotate at highspeed.l Shortcircuit between 21 and ground (Ignition switch :
OK: Radiator fan and condenser fan rotate at lowspeed.
l Check the radiator fan circuit
l Check the condenser fan circuit.
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ENGINE (TURBO)AND Troubleshooting
INSPECTION PROCEDURE 34
Ignition circuit system cause’
[Comment]l Malfunction of ignition The interrupts the ignition coil current by turning the transistor in- of side the ECM ON and OFF.l Improper connector contact, open circuit or,
shortcircuited harness wire
l Malfunction
the ECM
Engine (Turbo)>
Measure at the ignition coil connector
lDisconnect the connector and measure at the harness
side.
l Voltage between 3 and ground (Ignition switch: ON)
OK: Battery positive voltage
Engine>
Measure at the ignition coil connectors 0, lDisconnect the connectors and measure at the harnes s
side.
l Voltage between 1 and ground (Ignition switch: ON)
OK: Battery positive voltage
OK
lDisconnect the connector, and measure at the harnes s
side.
l Continuity between 3 and ground
OK: Continuitv
Check trouble symptom.
Check the ignition switch. (Refer to Ignition Switch.)
N GCheck the harness wire between ignition connectorand ground. Repair, if necessary.
OK
Check the following connectors: EngineNG Repair(Turbo)>, Engine>, A-l 11
OK
Check trouble symptom.
NG Replace
(Refer toGROUP16 Ignition System.)
Check the ignition power tranNG Replace
(Refer to GROUP 16 Ignition
OK
lDisconnect the connector, and measure at the harnes s
side.
1. Voltage between each of 1, and ground
(Ignition switch: ON)
OK: Battery positive voltage
2.
between each of 2. 7 and around Cranking)
OK:
Check the following con- NG Repair
I
Check trouble symptom.
NGI
Check the harness wire between the ignition coil an d ignition power
transistor unit connector. Repair, if necessary.
.
Check trouble symptom.
Check trouble symptom.
NG
Check the ignition signal circuit. (Refer to INSPECTION PROCEDURE
Replace the ECM.
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ENGINE (TURBO)
AND
ENGINE> Troubleshooting
INSPECTION PROCEDURE 35
Idle air control motor (DC motor) Engine>P r o b a b l e c a u s e
[Comment]l Malfunction of idle air control motor
The ECM controls the intake air volume during idlin g by opening and closing the I m p r o p e r c o n n e c t o r open “circuit’ servo valve located in the bypass passage.
l Malfunction of the
at the idle air control motor connector Connect the connector. (Use test harness: Voltage between 5 and ground (Ignition switch: ON)
OK: 2 or more to 0 (momentarily) Voltage between 6 and ground (Ignition switch: ON)OK: 4 or more to 0 (momentarily)
OK
the idle air control motor.1
Check symptom.
Replace
INSPECTION PROCEDURE 36
Scan tool: Inspection when no initial combustion oc curs
SCAN TOOL Data listNGCheck the power and ignition 16 Voltage of ECM power source (Refer to (Refer to I PROCEDURE 27.)
(Whenoil filler cap is removed.)
SCAN TOOL DTC
Are the diagnostic trouble codes output
Check timing belt for breakage.
INSPECTION CHART FOR TROUBLE CODES.
(Refer to
SCAN TOOL list NG
22 Crankshaft position sensor OK: Cranking speed is displayed.
OK
Check the crankshaft position sensor circuit malfu nction. (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODES
SCAN TOOL Actuator testCheck the fuel pump system Engine 07 Fuel pump (Refer to (Refer to INSPECTION PROCEDURE 28.)
OKCheck the fuel pump system (Refer to INSPECTION PROCEDURE 29) .
SCAN TOOL list21 Check the engine coolant temperature circuit (Refer to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODES
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