1990 MITSUBISHI SPYDER check engine

ENGINE (NON-TURBO)>
Scan tool 112
C o d e G e n e r a l s c a n t o o l C a t a l y t i c C o n v e r t e r E f f i c i e nc y
No.Failure,
64
[Comment]l Catalytic converter Backgroundl Heated oxygen sensor failedlDuring normal closed-loop operation, the PCM monito rs the catalytic converter for hydrocar-l E x h a u s tbon conversion (HC) efficiency.l . failedlWhen HC conversion drops below 60 percent efficienc y, the PCM stores a diagnostic
l PCM failed
trouble code. .
Range of Checkl
Engine coolant temperature greater than l Vehicle speed greater than for 2 minutesl Open throttlel Closed loop operationl Engine speed between 1248 and 2400 l MAP voltage between 1.50 and 2.60 Set Conditionl The switch (Lean/Rich) rate of the rear heated oxyg en sensor reaches 70% of the frontsensors switch rate.
Check the exhaust system.
l Check for cracks or exhaust leaks.Replace the exhaust manifold.
OK
SCAN TOOL SENSOR READ TESTS (Data list)
63 Downstream heated oxygen sensor volts
(Refer to
Transaxle: range
l with wide-open throttle
OK: 600 1000
SCAN TOOL SENSOR READ TESTS (Data list)
02 Upstream heateed oxygen sensor volts (Refer to
OK: 600 1000 during sudden racing
N G Check the heated oxygen sensor (rear) circuit(Refer to INSPECTION PROCEDURE
, , .
NGCheck the heated oxygen sensor (front) circuit (Ref er to INSPECTION PROCEDURE 42).
OK
SCAN TOOL SENSOR READ TESTS (Data list)
02 Upstream heated oxygen sensor volts (Refer to
OKRepeat 0 400 and 600 1000 alternately whenidling.
OK
Replace the heated oxygen sensor (rear).
Check trouble symptom.
N G
Check trouble symptom.
NG Replace the heated oxygen sensor (front).1
NG
Replace the PCM.
Revision

ENGINE (NON-TURBO)> Troubleshooting’
Scan tool 113
Code General scan tool Evaporative Purge Flow Monitor
No.
31
Failure
Purge line cloggedBackgroundl Vacuum hose failedl This is a functionality test.
l Evaporative purge solenoid failed lIf the fuel control doesn’t sense purge vapor flow from the canister, this code will be
l Evaporative emission cloggedset.Range of ChecklDifference between the long-ten adaptive memory val ues (fuel injection compensationvalue) is less than 5 shift injector pulse width when the evaporative purge solenoid
is turned on and off.
Engine speed: less than 2048 l MAP sensor output voltage: MAP sensor pressure right after ignition switch ON: lees than 87 (12.6 psi) Vehicle speed: 28-48 mph Driving at a constant speed The above conditions continue for at least 1 minut e. ConditionThere is little difference (1 failed count) between the MAP sensor output voltages (on .
the average for 2 seconds) when the evaporative pur ge solenoid is turned on and off.
Failures counted exceed 6 times while engine starts and then stops.
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ENGINE (NON-TURBO)>
Scan tool 114
Code General scan tool Park/Neutral Position (PNP)
No.Switch (transaxle range cause
Failure
37
[Comment]l range sensor failed Backgroundll
The diagnostics for the transaxle range sensor are divided into two categories.Transaxle range sensor l f a i l e d ’lThe first is trying to identify if the transaxle range sensor is indicating park or neutral
while driving.
lThe second involves identifying a condition in whic h the vehicle is in park or neutral butthe PCM indicates drive or reverse.Range of Check
l Vehicle speed greater than 80 (50 mph)
l Engine speed between 1984 and 4480
lThrottle position sensor voltage is greater than 0. 49 volts above minimum throttle position
sensor.
l MAP is greater than 66% of barometric pressure
Set Condition
l Transaxle range sensor output voltage: Low
Range of Check
l relay (ASD relay): ON
l Engine is cranking
Set conditionl Transaxle range sensoroutput voltage: High
,Check the transaxle range sensor
(Refer to GROUP On-vehicle Service.)
Measure at the transaxle range sensor connector lDisconnect the connector, and measure at the harnes s side.
1. Voltage between and ground
(Ignition switch: ON)
OK: Battery positive voltage
2. Voltage between
and ground
l Ignition switch: START
l Disconnect the PCM connector.
OK: Battery positive voltage
I
OK
Check the followingconnector:
the PCM.
Check the harness wire between the PCM and the tran saxle rangesensor connector.
Replace the PCM.
Check the following connectors:
Repair
Check the harness wire between the transaxle range sensor and
the ianition switch connector.
OKNG
Revision
Repair

ENGINE (NON-TURBO)> Troubleshooting
Scan tool 115
scan tool Power Pressure Probable.
65
[Comment]l PSP switch failedBackgroundl Wiring harness and connectors failed lData from the PSP switch allows the PCM to compensa te for the additional load put on
the engine during steering maneuvers that require h igh steering pump pressure.
Range of Check
l Vehicle speed: 90 (56 mph),Set Conditionl PSP switch output voltage: High for 30 seconds
N G Measure at the t h e P S P Disconnect the connector and measure at the compone nt side.
Measure at the switch connector lDisconnect the connector, and measure at the harness side.
l Voltage between 1 and ground
(Ignition switch: ON)
OK: Battery positive voltage
OK
Replace the PCM. Check the harness wire between the and the PSP switchconnector.
O K
Replace “the PCM.
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E N G I N E ( N O N - T U R B O ) >
Scan tool 118
C o d e
No. 72
[Comment]l Engine coolant temperature Backgroundl Intake air temperature sensor l The PCM monitors the fuel system for compliance wit h emission standards:’
l Head gasket ‘failed Range of Checkl Engine coolant temperature is greater than l Exhaust manifold cracked , l , Injectors failedl Closed loop operation
l MAP sensor failed .
Set Condition l Heated oxygen sensor failed,
l The test fails if the fuel control system reduces p ulse width by 25% long l regulator and 7% short term compensation due to a rich condit ion. W i r i n g failed
l Incorrect fuel used
l PCM failed
N G
05 Engine coolant temperature sensor. (Refer to
NGSCAN TOOL SENSOR READ
27 Intake air temperature sensor (Refer to
NGSCAN TOOL SENSOR READ TESTS (Data list)
11 MAP sensor reading (Refer to
OK
Check the engine coolant temperature circuit. INSPECTION -PROCEDURE 38.) . ., , ,
. - -
Check the intake air temperature circuit. (Refer t o INSPECTION PROCEDURE 39.)
Check the MAP sensor circuit. (Refer to INSPECTION
PROCEDURE
SCAN TOOL SENSOR READ TESTS (Data list)
63 Oxygen sensor volts (rear) (Refer to
l Transaxle: gear range l Drive with wide-open throttle
O K :
heatedoxygen circuit. PROCEDURE 41.) ,
OK
SCAN TOOL SENSOR READ TESTS (Data list)
02 Oxygen sensor volts (front) (Refer to
OK: during sudden racingINSPECTION PROCEDURE 42.) ,
SCAN TOOL SENSOR READ OK
Oxygen sensor volts (front) (Refer
OK
Check the following items.l Check the injectors for operation sound.
l Check the injectors for leakage.
l Check the evaporative emission control system.
l Check for contamination (water, kerosene, etc.) in the fuel.
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ENGINE (NON-TURBO)> Troubleshooting
Scan tool 119
Code General scan tool
No. 71Fuel System LeanProbable
51
[Comment]l Engine coolant temperature sensor Backgroundl The PCM monitors the fuel system for compliance wit h emission standards.l
Intake air temperature sensor failed- l Head gasket Range of Check
l Exhaust manifold cracked
l Engine coolant temperature is greater than l Injectors failed
l Closed loop operation
l MAP sensor failed
Set Condition
l Heated oxygen sensor failedlThe test fails if the fuel control system increases pulse width by 25% long term memory
and 12% short term compensation due to a lean condi tion.l
Fuel pressure regulator l l Fuel filter or fuel line blocked
l Fuel pump failed (insufficient discharge)
l Incorrect fuel used
__
l PCM failed
NGSCAN TOOL SENSOR READ TESTS (Data list)
05 Engine coolant temperature sensor (Refer to
SCAN TOOL SENSOR READ 27 Intake air temperature sensor to
SCAN TOOL SENSORREAD11 MAP sensor reading (Refer to
I
NG
Check the engine coolant temperature circuit.
(Refer to INSPECTION PROCEDURE 38.)
Check the intake air temperature circuit.(Refer to PROCEDURE 39.)
Check the MAP sensor circuit.
( R e f e r
63 Oxygen sensor volts (rear) (Refer to l Transaxle: gear range
SCAN TOOL SENSOR READ TESTS (Data list)
02 Oxygen sensor volts (front) (Refer to
OK: during sudden racing
NG Check the heated oxygen sensor (front) circuit.(Refer to INSPECTION PROCEDURE 42.)
SCAN TOOL SENSOR READ TESTS (Data list)
02 Oxygen sensor volts (front) (Refer to
OK: Repeat and alternately whenidling.
Check the fuel pressure. (Refer to
OK
Check the following items.
l Check the injectors for operation sound.
,
l Clean the injectors.
l Check the positive crankcase ventilation system.
l Check the fuel pump.
lCheck the fuel filter and fuel line for blockages.
l Check for exhaust gas leaks.
l Check for contamination (water, kerosene, etc.) in the fuel.
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(NON-TURBO)>
Scan tool 126
Code General scan tool Downstream Shorted to
No. 38Voltage
21
[Comment]l Heated oxygen sensor failedBackgroundlDownstream heated oxygen sensor requires a heater c ircuit for proper operation.l harness and connectors
l
The heater circuit is supplied with battery voltage through the relay relay).l .
lA failure in the sensors heater circuit prevents it
from providing accurate data to the lIf the PCM monitors more than 1.2 volts, the sensor has 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.
NGCheck the heated oxygen sensor (rear). (Refer to R e p l a c e
OKNGCheck the following Repair
OK
Check trouble symptom.
NG
Check the harness wire between the PCM and the hea ted NG
sensor (rear) connector.
OK
Replace the PCM.
Scan tool 128
Code General scan tool Closed Loop Temperature
No.
17
[Comment]l Thermostat fully openBackgroundl Engine coolant temperature sensorl The fuel control system remains in open loop due to low engine lEngine coolant temperature sensor lThis DTC will be stored if engine temperature remains for 10 minutesimproperly connected
of operation and no engine coolant temperature sens or code has been set.
l PCM failed,
Range of Check
l Engine: running ,Set ConditionlEngine coolant temperature does not exceed after 10 minutes have passed ,
since starting the engine.
,
NGCheck the thermostat. (Refer to GROUP 14 Thermostat.) Replace
OKNG Replace
Check the following connectors:NG Repair
Check trouble symptom.
temperature
sensor connector. OK
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ENGINE (NON-TURBO)>
Scan tool 129.
C o d e G e n e r a l s c a n t o o l D o w n s t r e a m Stays at
No. 40. 21
[Comment]Backgroundl Heated oxygen sensor (rear) ,
l Sensor output voltage is checked. l
Sensor signal circuit open
PCM failedlIf voltage stays at center instead of switching, an open circuit is likely.Range of Check
. .l 2 minutes after starting enginel Engine coolant temperature: More than Set Condition.lNeither rich nor lean condition is detected from th e downstream heated oxygen sensor .
input. (Voltage is 0.5 volts for 1.5 minutes)
Check the heated oxygen sensor (rear)
OK
NG
N G
Replace
Repair
OK
Check trouble svmptom.
NG
Check the harness wire between thesensor (rear) connector.
OK
NG Repair
Replace the PCM.
Scan tool 132
Code
No.
scan tool Throttle Position Does Not Agree
Map
24
[Comment] Background
lThis DTC indicates a failure in the rationality che ck comparing MAP values to throffleposition.Range of Check
l Engine speed: less than 1,500
l Subtract MAP value from atmospheric pressure:
more than 13 (19 psi) [when atmospheric pressure is more than 7 7 (11 psi)]
more than 6 (0.9 psi) [when atmospheric pressure is less than 77 (11 psi)]
Set Condition
l Throttle position sensor output voltage is 3.75-4.7 1 V.
Range of Check
l Engine speed: more than 1,500
l Vehicle speed: more than 25 mph
l Subtract MAP value from atmospheric pressure: less than 13 (19 psi)
Set Condition
l Throttle position sensor output voltage is
V.
SCAN TOOL SENSOR READ TESTS (Data list)
07 Throffle position (Refer to
OK
. _ -
SCAN TOOL SENSOR READ TESTS (Data list)
69 MAP gauge reading (Refer to
t -
OK
Replace the PCM.
. sensor failed position sensor related lMAPlM A P related circuit
.
Check the throffle position sensor system. (Refer. I N S P E C T I O N P R O C E D U R E FO RC O D E (Refer to I N S P E C T I O NPROCEDUREF O R D I A G N O S T I C T R O U B L E C O D E
Check the MAP sensor system. (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 (Refer to INSPECTION FOR DIAGNOSTIC TROUBLE CODE
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