1990 MITSUBISHI SPYDER Service Repair Manual

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Page 545 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE>
Code No. 5 Engine Coolant Temperature Circuit
Malfunction Probable
[Comment]l
Engine coolant temperature BackgroundlOpen shorted engine l theenginecoolanttemp

Page 546 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. Throttle Position Circuit MalfunctionProbable cause’
[Comment]lThrottle position sensor failed or Backgroundl lThe throttle pos

Page 547 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual 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 ex

Page 548 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. (Heated Oxygen) Sensor Circuit . .
Malfunction (Bank Sensor 1)
[Comment]lBackgroundHeated oxygen sensor deteriorated , ,l
lWhen

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
TSB Revision
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.

Page 549 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE> Troubleshooting
Code No. 35 (Heated Oxygen) Sensor Heater Circuit Probable cause
Malfunction (Bank 1 Sensor 1)
[Comment]BackgroundOpen or shorted oxy

Page 550 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual 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 modul

Page 551 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE (TURBO)
AND ENGINE>
Code No. (Heated Oxygen) Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)
[Comment]
Background
lThe engine control module checks whether the heater curre

Page 552 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual 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

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.
TSB Revision1
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

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