1990 MITSUBISHI SPYDER fuel pump

ENGINE (TURBO)
AND ENGINE> General lnformaiton
Engine>
Heated oxygen sensor Power supply(front)l Vehicle speed sensor Volume air flow sensor l switch Intake air temperature Park/neutral positionsensorswitch Throttle position sensor Power steering pressure Closed throttle positionswitch
switchl Ignition switch ST Camshaft position sensor Crankshaft position sen-sor Barometric pressure sen-sor Engine coolant tempera-
ture sensor
valve position sensor Heated oxygen sensor(rear) Manifold differential pres-sure sensor tank differential pres-
sure sensor
,
Engine control Injector l
Fuel pump relay Evaporative emission lFuel pump relay purge solenoid air control motor injection EGR solenoid relay Evaporative emission l ventilation solenoid clutch relay
l C h e c k
o u t p u t coil, ignition
T h r o t t l e s e n s o r ,
control
Intake air
t e m p e r a t u r e
. . . sensor pressure
a
temperature sensor EGR
solenoidHeated oxygen
Fuel tank pressure
sensor (rear) Heated oxygen
Evaporativeemission canisterFuel tank
Crankshaft position sensor
Camshaft positionsensor
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Excessive to Enter Closed Loop Fuel
Control
[Comment]l Heated oxygen failedBackgroundl Injector failed
l The system reduces exhaust emissions by means of close d-loop fuel control.
l Fuel pressure regulator failedlThe engine control module checks the time taken unt il closed-loop fuel control commences.l Fuel pump failed
Check Areal Fuel filter blocked,
l Engine coolant temperature is higher than l into intake system-
l Intake air temperature is
or higher E x h a u s t - g a s l e a k
l Barometric pressure is 76 (11 psi.) or higher. l
Engine control module l Engine speed is at between about 1800 and 3500 l Volumetric efficiency is 16 62%.
l Running within air/fuel mixture ratio feedback zone .
l Monitoring time: 128
Judgement Criterial fuel injection system doesn’t enter the closed loo p control within about 30 sec.
l Monitored only once per trip.
,
Check the heated oxygen sensor (front). (Refer to Replace
Engine>
NG Repair
OKNGCheck the harness wire between the ECM and the heat ed oxygensensor connector. Repair
OK
Check meInjector. (Refer to P.lNG Replace
OKNG Repair
OKNG Repair
OK
Check the fuel pressure. (Refer to
l Check for air being drawn into me air intake system .lCheck for exhaust gas leaks (oxygen sensor fitting, exhaust
l Check the fuel pump (insufficient discharge).
Replacethe ECM.
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Fuel Trim Malfunction (Bank 1)
[Comment]
Background
lIf a malfunction occurs in the fuel system, the fue l compensation value becomes too largeor too small.lThe engine control module checks whether the fuel c ompensation value is within a specified
range.
Check Areal Under the closed loop air-fuel ratio control
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
Judgement CriterialLong-range fuel correction has continued to be not lower than or not higher than
-12.5% for 10 sec.
lShort-range fuel correction has continued to be not lower than or not higher than-10.0% for 10 sec.
SCAN TOOL Data list 13 Intake air temperature sensor (Refer to
Probable
l V o l u m e ‘ a i r l Injector failed .Incorrect fuel pressure
Air drawn gaps seals,’ etc.
Heated oxygen sensor
Engine coolant temperature sensor failed, Intake air, temperature sensor f a i l e d Exhaust gas leaks
E n g i n e
NG Check the intake air temperature circuit malfuncti on. (Refer to INSPECTION PROCEDURE TROUBLE CODE
NGSCAN TOOL Data list Check the engine coolant malfunction (Refer
21 Engine coolant temperature sensor (Refer to to INSPECTION PROCEDURE
OKTROUBLE CODE
SCAN TOOL Data list
25 Barometric pressure sensor (Refer to
OK
NG Check the barometric pressure circuit INSPECTION PROCEDURE D I A G N O S T I C
TROUBLE CODE
NGCheck the injector (Refer to Replace
OK N G
Check the following connectors: Repair
NG Repair
OK
Check the fuel pressure (Refer to
OK
SCAN TOOL Data list
Morethan zero Check if air was drawn N G Repair81 Long-term fuel compensation (Refer to l fuel trim more or less than zero?I
sensor(Refer to l Does the tester indi-
cate more than the
standard value?
Yes
Replace the volume airflow sensor.
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lCheck for fuel leakingfrom injectors.lCheck for contamina-
tion (water, kerosene,
etc.) in the fuel.
OK
Replace the ECM
into the intake
OK
SCAN No
12 Volume air flow sensor(Refer to l Does the tester indi-
cate less than the
standard value?
l Check for blockedinjectors.l Check for fuel filter
and fuel line block-
ages.l Check the fuel pump(insufficientdis-charge).l Check for exhaust
gas leaks (oxygen
sensorfitting, exhaust
manifold cracks, front
pipe cracks, etc.)lCheck for contamina-
tion (water, kerosene,
etc.) in the
OK
Replace

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)
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.

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> 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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