1990 MITSUBISHI SPYDER coolant temperature

ENGINE (TURBO)
AND
ENGINE> Troubleshooting
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES (FAULT TREE)
DTC No.Diagnostic items Check items (Remedy) MemoryRefer-
,
00Volume air flow circuit malfunctionl Harness and connector
R e t a i n e d
(If harness and connector are not
defective, replace volume air flow
sensor assembly.)
Barometric pressurel Harness and connector
‘ R e t a i n e d
circuit malfunction(If harness and connector are not
defective, replace volume air ,
sensor assembly.)
Intake air temperature circuit l Harness and connector R e t a i n e d
functionlIntake air temperature sensor
Engine coolant temperature circuitl Harness and connector
Retained
malfunctionl Engine coolant
20Throttle position circuit malfunctionl Harness and connector R e t a i n e dl Throttle position sensor
l Closed throttle posit& switch
25
30
‘0136
‘0141
‘0170
Excessive time to enter closed sensor (front) R e t a i n e d
Loop Fuel Control*l sensor harness and connector
I n j e c t o r
sensor circuit malfunction (Bankl
Harness and connector R e t a i n e d
1 Sensor 1)(If harness and connector are not
d e f e c t i v e , r e p l a c e
s e n s o r
(front).)
sensor heater circuit malfunctionl Harness and connector R e t a i n e d
(Bank 1 Sensor 1) sensor (front)
sensor circuit malfunction (Bankl Harness and connector R e t a i n e d
1 Sensor 2) sensor (rear)
sensor heater circuit malfunctionl
Harness and connector R e t a i n e d
(Bank 1 Sensor 2)l sensor (rear) heater
Fuel trim malfunctionl
V o l u m e a i r f l o w s e n s o r o u t p u t R e t a i n e d
(Bank 1)frequency
I n j e c t o r
l F u e l p r e s s u r e
l I n t a k e a i r l e a k s
lEngine coolant temperature sensorlIntake air temperature sensor
l Barometric pressure sensor
S e n s o r
l Exhaust manifold
‘0201 Injector circuit malfunction Cylinderl
Harness and connector R e t a i n e d
1 I n j e c t o r
‘0202Injector circuit malfunction Cylinder
2
‘0203Injector circuit malfunction Cylinder.
3
‘0204Injector circuit malfunction CylinderlHarness and connector R e t a i n e d
4Injector
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ENGINE (TURBO)
AND
ENGINE> Troubleshooting
DTC No.Diagnostic items Check items (Remedy)MemoryRefer-
; ,
Evaporative emission control systeml Harness and connector
Retained
pressure sensor malfunctionl
Engine>F u e l t a n k d i f f e r e n t i a l p r e s s u r e
sensor
Vehicle speed sensorl Harness and connectormalfunctionl Vehicle speed sensor Retained
Idle control systeml
Harness and connector
RetainedmalfunctionlIdle air control motor
Closed throttle position switch mal-e Harness and connector Retained
functionlClosed throttle position switch
Power steering pressure sensor l Harness and connector
Retained
range/performancelPower steering pressure switch
Transaxle range sensor circuit mal-e Harness and connector Retainedfunction Input)lPark/neutral position switch
Turbocharger waste gate actuatorl Harness and connector
Retained
malfunctionl Turbocharger waste gate solenoid
Engine (Turbo)>l Turbocharger waste gate actuator ,
lVacuum hose routing
Turbocharger waste gate solenoidl Harness and connector Retained
malfunctionl Turbocharger waste gate solenoid
Engine (Turbo)>
Fuel pressure solenoid malfunctionl Harness and connector
Retained
Engine (Turbo)>lFuel pressure solenoid
Manifold differential pressure (MDP)l Harness and connector Retainedsensorcircuitl
MDP sensormalfunction
Pi 500Generator terminal
circuit malfunctionlHarness and connector
Serial communication link
tion
l Harness and connector R e t a i n e d
‘1750
‘1791PG assy malfunction
l
Harness and connector RetainedlPulse generator
Solenoid assy malfunction
l Harness and connector Retained
l
Converter clutch solenoid
l Shift control solenoid
lPressure control solenoid
Engine coolant temperature level in-
lHarness and connectorRetained
put circuit (to TCM) malfunction
1. Do not replace theengine control module (ECM) until a thorough termin al check reveals there are
no short/open circuits.
2.After the ECM detects a malfunction, a diagnostic t rouble code is recorded when the engine is next
started and the same malfunction is re-detected. Ho wever, for items marked with a the diagnostic
trouble code is recorded on the first detection of the malfunction.
3.
Heated oxygen sensor
4. Sensor 1: indicates sensors which are mounted cl osest to the engine.
5. Sensor 2: indicates sensors which are mounted ne xt-closest to the engine.
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ENGINE (TURBO)
AND ENGINE>
Code No. 5 Engine Coolant Temperature Circuit
Malfunction Probable
[Comment]l
Engine coolant temperature BackgroundlOpen shorted engine l theenginecoolanttemperature and outputs it. sensor circuit, or l
The engine control module checks whether the voltag e is within a specified range.l
Engine control module In addition, it checks that the engine coolant temp erature (signal) does not drop while
the engine is warming up.
Check Area, Judgement Criteria
1. Check Area, Judgement Criteria
lSensor output voltage has continued to be 4.6 or higher [corresponding to an enginecoolant temperature of or lower] for 4 sec.
or
lSensor output voltage has continued to be 0.1 or lower [corresponding to an enginecoolant temperature of or higher] for 4 sec.
2. Check Area, Judgement CriterialSensor output voltage increased from a value lower than 1.6 to a value higher than1.6 [Engine coolant temperature decreases from a highe r than temperature to a lower than temperature.]lThen the sensor output voltage has continued to be 1.6 or higher for 5 min.
3. Check Area
lEngine coolant temperature is approximately immediately after engine
is started.
Judgement CriterialAbout 60 300 have passed for the engine coolant temperature to about after starting sequence was completed.
Measure at the engine coolant
temperature sensor connector
l Disconnect the connector, and
measure at the harness side.
l Voltage between 1 and ground
(Ignition switch: ON)
OK:
l Continuity between 2 and ground
OK: Continuity
Check trouble symptom.
NG
Replace the ECM.
Replace the
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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.
Revision

ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. (Heated Oxygen) Sensor Circuit . .
Malfunction (Bank Sensor 1)
[Comment]lBackgroundHeated oxygen sensor deteriorated , ,l
lWhen the heated oxygen sensor begins to the sensor signal responseOpen circuit in heated oxygen l i n ebecomes poor. l Engine control module failedlThe engine control module forcibly the mixture to make it leaner and richer,and checks the response speed of the heated oxygen sensor.In addition, the engine control module also checks for an open circuit in the heated oxygensensor output line.
Check Area, Judgement Criteria
1. Check Areal Engine coolant temperature sensor: normallHeated oxygen sensor signal voltage has continued t o be 0.1 or lower for 3 minor more after the starting sequence was completed.l Engine coolant temperature is higher than l Engine speed is higher than 1200 l Volumetric efficiency is not lower than 25%.
l intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
Judgement CriterialInput voltage supplied to the engine control module interface circuit is not lower than
4.5 when 5 is applied to the heated oxygen sensor output line via a resistor.
2. Check Area l Engine coolant temperature sensor: Normal
l Engine
temperature is not lower than l Engine speed is between 1500 and 3000 lEngine speedis between and 3000 l Volumetric efficiency is 25 60%.
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
l Under the closed loop air-fuel control.
l Monitoring time: 6
Judgement CriterialWhen the air-fuel ratio is forcibly changed (lean t o rich and rich to lean), the heated
oxygen sensor signal doesn’t provide response withi n 1.2 sec.
l Monitored only once per
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Check the heated oxygen sensor
(front). (Refer to N G Repair
NGOK
ReplaceCheck trouble symptom.
NGNGCheck the harness wire between the Repair
ECM and the heated sensor (front) connector.. .
OK
Replace the oxygen sensor (front).
I
Check trouble symptom.
NG
Replace the ECM.

ENGINE AND ENGINE> Troubleshooting
Code No. (Heated Oxygen) Sensor Circuit
Malfunction (Bank 1 Sensor 2)
[Comment]l Heated oxygen sensor B a c k g r o u n dllThe engine control module checks for an open circui t in the heated oxygen sensor outputOpen circuit in ,
line.l
Check Areal Coolant temperature sensor: normallHeated oxygen sensor signal voltage has continued t o be 0.1 or lower for 3 min or. . .more after the starting sequence was completed.
l Engine coolant temperature is not lower than .
. . l Engine speed is higher than 1200 l Volumetric efficiency is not lower than 25%.
l Intake air temperature is or higher
l Barometric pressure is 76 (11 psi.) or higher.
l Monitoring Time:
Judgement CriterialInput voltage supplied to the engine control module interface circuit is not lower than 4.5 when 5 is applied to the heated oxygen sensor output line via a resistor.lMaking the air-fuel ratio 15% richer doesn’t result in raising the heated oxygen sensoroutput voltage beyond 0.1 V.
tne neatea oxygen sensor (rear).(Refer to
ReplaceCheck trouble symptomr
Check “trouble symptom.
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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

E N G I N E ( T U R B O ) .
AND ENGINE> ,
Code No. Random Misfire Detected
[Comment]l Ignition system related part(s) BackgroundlIf a misfiring occurs while the engine is running, the engine speed suddenly changes.l
Poor crankshaft sensor l Incorrect air/fuel ratiol The engine control module checks for changes in the engine speed.
l Low compression
Check ArealEngine coolant sensor: l 5 or more have passed after the engine was started. l
liming belt broken
l Engine speed is at between 500 and 6000 l Injector failedl Engine coolant temperature is or higher, l
EGR valve failed
l Intake air temperature is or higherlEngine control l Barometric pressure is 76 (11 psi.) or higher.l Running free from sudden accelerations/deceleration s such as shift change.
Judgement Criteria. .
(change in the angular acceleration of the crankshaft is used for misfire detection.)lMisfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than
orlMisfire has occurred in 20 or more of the last 1000 revolutions (corresponding to 1.5
times the limit of emission standard.) I,
SCAN TOOL Data list
22 Crankshaft position sensor (Refer to
l Crankshaft position sensor wave form check
l Engine speed: stable
OK: Constant pulse range
OK
position sensor and
Check the injector (Refer toNG Replace
Check the fuel trim malfunction (bank 1) (Refer to IN-SPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
SCAN TOOL list
21 Engine coolant temperature sensor (Refer to
OK
Check the engine coolant temperature circuit malfu nction (Refer
to INSPECTION PROCEDURE FOR DIAGNOSTICTROUBLE CODE 5.)
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the compression pressure.
l Check for broken timing belt teeth.
l Check the EGR system and the EGR valve.
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