1990 MITSUBISHI SPYDER check engine

ENGINE (NON-TURBO)>
Scan tool 42
Code General scan tool
No.Ignition Coil CircuitP r o b a b l e
43
[Comment]
BackgroundlIgnition coil wiring harness or connectorfailedl The PCM provides the ground control circuit for the side of ignition coil. Open circuit in coill Battery voltage is through the relay (ASD relay). P C M Range of Checkl Battery voltage: 13 or more (engine is running)
l relay (ASD relay): ON
l Engine: 3000 or lessl Engine speed and ignition timing are always stable.
Set Condition
lThe primary circuit is not achieving peak current w ith maximum dwell for 3 seconds.
SCAN TOOL Actuator test 10
relay (ASD relay)
OK: ooeratina sound can be heard.
NG Repair relay (ASD relay) related
OK
Measure at the ignition coil connector lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test 10
relay (ASD relay) relay (ASD relay) is turned on and off 1.4 seconds.
l Voltage between 2 and ground
[Measure with
relay (ASD relay) on.]
OK: Battery positive voltage Check the harness wire the (ASD-relay) and
the ignition coil connector. Repair,’ necessary.
NGMeasure at the PCM connector Check the following connector: lDisconnect the connector and measure at the harness side.lDisconnect PCM connector and short terminal (67) of
the harness-side connector to ground.
Voltage between 3 and ground OK: Battery positive voltage
OK
Check the harness wire between PCM and the ignition connector. Repair, if necessary.
Check the following connector:
OK
NG Repair
Check trouble symptom.
Replace the PCM.
N G
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ENGINE (NON-TURBO)> ,
Scan tool 43
Code General scan tool
No.Ignition Coil Primary CircuitP r o b a b l e
43
[Comment]lBackgroundIgnition coil wiring harness orfailedl
The PCM provides the ground control circuit for the primary side of ignition coil. Open circuit in ignition l Battery voltage is supplied through the relay relay).
l PCM failedRange of Check Battery voltage: 13 or more (engine is running)l relay (ASD relay): ON
l Engine: 3000 or less
l Engine speed and ignition timing are always stable.
Set Condition
. .
lThe primary circuit is not achieving peak current w ith maximum dwell for 3 seconds.
SCAN TOOL Actuator test
10 relay (ASD relay)
NG Repair relay (ASD relay) related
OK: Relay operating sound can be heard.
Measure at the ignition coil connector lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test 10
relay (ASD relay) relay (ASD relay) is turned on and off every 1.4 s econds.
l Voltage between 2 and ground
[Measure with
relay (ASD relay) on.]
OK: Battery positive voltageCheck the harness wire between the ignition coil connector. if necessary.
Measure at the PCM connector
lDisconnect the connector and measure at the harness side.lDisconnect PCM connector and short terminal (67) of
the harness-side connector to ground.
l Voltage between 2 and ground
OK: Battery positive voltage
OK
Check the harness wire between thePCM andthe ignition coil
connector. Repair, if necessary.
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Check the following connector:
OK
NG Repair
Check trouble symptom.
N G
Replace the PCM.

ENGINE (NON-TURBO)> Troubleshooting
Scan tool 44
C o d eNo relay) output
No.General scan tool V o l t a g e a t P C M
42
[Comment]l relay (ASD output openBackgroundl Fused circuit openlThe PCM senses operation of the relay (ASD relay) by measuring relay voltage.
l relay (ASD reiay) failed .
(If relay turns to ON, voltage is high). l Circuit in faked
.lThis DTC indicates that no voltage is being sensed when the relay (ASD relay) is
being energized.
Range of Check
l Battery voltage: or more ,
l switch: ON
l Unless the engine is cranking
Set Condition
l The relay voltage is low for 1 second.
.
NG Replace
Measure at the
relay (ASD relay) connector lDisconnect the connector and measure at the harness side.
l Voltage between 6 and ground
OK: Battery positive voltage
l Voltage. between 6 and ground
OK: Battery positive voltage
OK
, .
Check the harness wire the relay relay) and,
the fusible link. Repair,
NGCheck the followingconnect Repair
OK
Check trouble symptom.
N G NG
Check the harness wire between the PCM and the relay (ASD Repair
relay) connector.
Check trouble symptom.
the PCM.
NG
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E N G I N E
Scan tool 46
Code General scan toolEGR System Failure c a u s e No.
32
[Comment]Backgroundl EGR valve
l Once per vehicle trip the PCM monitors the EGR syst em fiow rate.. t u b e l harness and lIf the flow rate is above or below the acceptable l
imits, the PCM stores a’ diagnostic
l Vacuum hoses’ failed
trouble code.
Range of Check
l Engine temperature is greater than
l More than three minutes have passed since start-up.
l Engine is between 1952 and 2400.
l MAP voltage is between and 2.70.
l TPS voltage is between 0.6 and
Vehicle speed exceeds 3 mph. Short term fuel compensation value is exhibiting l ess than During air/fuel ratio closed loop control ConditionThe measured change in the short-term fuel compensa tion value shift during the test is
less than 7.4% or greater than 20.5%.
Check the idle running.
l Idle running after warming up
lRemove the vacuum hose from the EGR valve nipple an d plugit.lConnect a hand vacuum pump to the EGR valve nipple, and
apply a 12 (3.5 of vacuum.
OK: Idle speed becomes unstable or the engine stalls.
NG.lCheck the EGR valve and replace if lCheck the EGR tube for and clean or it . .
OK
OK
Repair
Check the EGR solenoid circuit. (Refer to INSPECTIONP R O C E D U R E F O R D I A G N O S T I C T R O U B L E C O D E S
Scan tool 46
Code General scan tool PCM Failure
No.SRI Mile Not Stored
62
Revision
[Comment]lUnsuccessful attempt to update service reminder ind icator (SRI or mileage in the
control module EEPROM.
Replace the PCM.I
Probable cause

ENGINE , Troubleshooting
EEPROM Write DeniedProbable.
[Comment)l Unsuccessful attempt to write to an EEPROM location by the control module.l
PCMI
Replace the PCM.
Scan tool 57
Code General scan Intake Air Temperature
No.Voltage Low
23
[Comment]l Sensor to Backgroundl Sensor internally shortedlWhen the fuel system is in the open loop mode, the heated oxygen sensor cannot be
l PCM failed
used for injector pulse width calculation.
l In this instance, the system uses information on ai r mass to determine the correct
,
width necessary to achieve the proper air/fuel rati o.lBecause air mass is related to temperature, informa tion from the intake air temperature ,
sensor is necessary.
Range of Check
l Ignition switch: ON
Set Condition
lIntake air temperature sensor output voltage is les s than 0.2 for 3 seconds.
N GCheck the intake air temperature sensor. (Refer to Replace
OK
Repair
OK
Check trouble symptom.
N G
Check the harness wire temperature sensor connector.
OK
Repair
Replace the PCM.
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ENGINE
Scan tool 59. . ,
Knock Sensor CircuitNo.
16
[Comment]
Background
lThe sensor consists of a material that constantly vibrates, sending asignal to the PCM when the engine is operating.lWhen the signal exceeds a threshold, the PCM retards engine ignition timing to reduce
Set Condition
l Knock sensor signal below minimum acceptable thresh old voltage.
Knock sensor output voltage is above 5.0 volts.
l Knock sensor lOpen or shorted knock sensor l
. .
,
I
Measure at the knock sensor connector Check the following lDisconnect the connector, and measure at the harnes s side.
l Continuity between 2 and ground
OK: Continuity,
OK
if.
NG.
Repair .
OK
Check trouble symptom.
N G Repairconnector.
OK
Replace the knock sensor.
.
Check trouble symptom.
NG
Replace the PCM.
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E N G I N E
Scan tool 61
Code General scan tool
No.Injector Control Circuit c a u s e
27
[Comment]
Backgroundl Open or shorted injector control
l Grounds for the injector circuits are provided by t he PCM.l
Open injector
l Battery power is provided through the relay. (ASD relay) l
O p e n in PCM lThis DTC is set if an open or short-circuit is detected in the control forthe individual injector.Range of Check
l Battery voltage: or morel relay (ASD relay): ON Engine: 3000 or lessSet ConditionlCounterelectromotive force is not detected for thre e seconds immediately after injectors off.
Check the injector. (Refer to
OK
Measure at the injector connector lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test 10
relay (ASD relay) istumedonandoff l Voltage between 2 and ground
[Measure with the relay (ASD relay) on]
OK: Battery positive voltage
N G the following connect&s:
OK NG
Check trouble symptom. Repair
NG
Check the harness wire between the the injector connector. Repair, if necessary.
NG Measure at the PCM connector Check the following connectors: lDisconnect the connector, and measure at the harnes
s side.lDisconnect PCM connector and short terminal (67) of
the harness-side connector to ground.
l Voltage between 16 and ground
OK: Battery positive voltage
Check the harness between PCM and injector connecto r; if necessary.
OK
Check the NG Repair
OK
Check trouble svmotom.I
Replace the PCM.
NG
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ENGINE (NON-TURBO)>
NG Replace
Scan tool 62
Code General scan tool Upstream Shorted to Volt;
No.
21
[Comment]l Heated oxygen sensor failedBackgroundl W i r i n glUpstream heated oxygen sensor requires a heater cir cuit for proper operation.
l PCM,
l The heater circuit is supplied with battery voltage through the
relay relay):lA failure in the sensors heater circuit prevents it from providing accurate data to the PCM.l the PCM monitors more than 1.2 volts, the sensor h as shorted to heater circuit voltage.Range of Checkl Two or more minutes after the engine startsl Engine coolant temperature: or moreSet Conditionl Heated oxygen sensor output voltage is more than 1. 2 for 3 seconds.
OK
OKNG Repair
Check trouble symptom.
NGNGCheck the harness wire between the PCM and the heat ed oxygen Repairsensor (front).
OK
Replace the PCM.
Scan tool 68
Code General scan tool PCM Failure
No. Communications
53
[Comment]Set Condition
l There is no communication between in the control module.
Probable cause
l PCM failed
the PCM.
Probable cause
[Comment] BackgroundlBattery temperature input is used to adjust the gen erator charging rate based upon the
ambient temperature around the battery.
Range of Check
l
switch: ON
Set Condition
lThe sensor voltage is not within the acceptable ran ge of 0.3 to 4.9 volts for 3 seconds
or more. l
Battery temperature sensor failed
l PCM failed
Replace the PCM.
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