1990 MITSUBISHI SPYDER coolant temperature

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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ENGINE
Scan tool 92
C o d e G e n e r a l s c a n t o o l L o w S p e e d F a n
No.Circuit, 35,
[Comment]l Relay coil open or shortedBackgroundlThe low speed radiator fan relay controls the low of the radiator fan. l
Ignition switch output circuit openOne side of the relay control coil is supplied with 12 volts when the ignition switch isl
Low speed radiator fan l o r turned to the ON position.
l The circuit is completed when the other side of the relay coil is grounded by the PCM.l .
lThe PCM grounds the relay control circuit depending
on engine coolant temperature etc. . . Range of Checkl
Battery voltage: 10 or morel Ignition switch: ONSet ConditionlAn open or short-circuit condition is detected in t he low speed radiator fan relay controlcircuit for 3 seconds.
NGMeasure at the PCM connector Check the radiator fan relay drcuit.lDisconnect the connector, and measure at the harnes s side.
l Voltage between 55 and ground
(ignition switch: ON)
OK: Battery positive voltage
l Connect a jumper wire between 55 and ground.
(Ignition switch: ON)
OKRadiator fan runs at low speed.
OKNG Repair
OK
Check trouble symptom.
Replace the PCM.
NG
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ENGINE
Scan tool 93
Code General scan tool High Speed Fan
No.Control Relay Circuit
35
[Comment]
Background
lThe high speed condenser fan relay controls the hig h speed operation of the condenserfan.lOne side of the relay control coil is supplied with 12 volts when the ignition switch is
turned to the ON position.
lThe circuit is completed when the other side of the relay coil is grounded by the PCM.lThe PCM grounds the relay control circuit depending on engine coolant temperature and
other conditions.
Range of Check
l Battery voltage:
or more Ignition switch: ONSet ConditionAn open or shorted condition is detected in the hig h speed condenser fan relay controlcircuit for 3 seconds.
lRelay, coil open, shorted . ..
lHigh speed condenser fan relay control circuito p e n PCM failed
Measure at the PCM connector lDisconnect the connector, and measure at the harnes s side.Check the condenser fan circuit.
l Voltage between 19 and ground
(Ignition switch: ON)
OK: Battery positive voltage
l Connect a jumper wire between 19 and ground.
(Ignition switch: ON)
OK A/C condenser fan runs at high speed.
OK. . . . NG RepairCheck the following connector: IOK
Check trouble symptom.
Replace the PCM.
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ENGINE (NON-TURBO)>
Scan tool 102
Code General scan tool
No. Response
21
[Comment]
Backgroundl Heated oxygen sensor failed
l Exhaust system failed
During closed-loop operation the PCM monitors the h eated oxygen sensor response ratefor proper operation.-Pipes
lResponse rate is the time required for the heated o xygen sensor to switch from - s e a l sonce the sensor is exposed to a richer than the ide al air fuel mixture.
If the response rate is below the acceptable limit, the PCM stores a diagnostic troublel harness and connectors l
l PCM failed .code.Range of Checkl Engine coolant temperature greater than l Approximately three minutes elapsed time after star t-up.
lVehicle has operated at more than for 75 seconds with engine coolant temperatureat.
l Power steering pressure switch is offl Vehicle is at idle with engine speed between 512 an d 864 lThis test may be inhibited if the A/C is cycling to o rapidly. (Testing with the off issuggested)Set Condition.Heated oxygen sensor does not produce 0.67 volt out put and/or does not perform enoughswitches within the test threshold time of 6 seconds.
NGCheck the exhaust l Check for cracks or exhaust leaks. Repair
OK
Check the following connectors: N G Repair
OK
Check trouble symptom.
NG
NG
Check the harness wire between Repair
sensor (front).
OK
[Replace the heated oxygen sensor (front).
Revision

ENGINE (NON-TURBO)>
Scan tool 106
Code General scan tool
No.Multiple Cylinder Mlsfire
43
[Comment]Background
l Excessive engine misfire results in increased catal yst temperature.
l Severe misfire could cause catalyst damage.
l To prevent catalytic converter damage, the PCM moni tors engine misfire.
l The PCM monitors for misfire during most engine ope rating conditions.
lWhen a misfire is detected, the PCM stores a diagnostic trouble code and causes the to either flash or illuminate continuously during active misfire.
Range of Check
l MAP voltage is less than 1.60
l Engine speed is between 2200 and 2800 l Engine coolant temperature is greater than l Vehicle speed less than Set Condition
l 1000 Rev Misfire
The PCM detects misfire in more than 1.6% of the en gine cycles in a 1000 revolution
period.l 200 Rev MisfireThe PCM detects misfire in more than 15% of the eng ine cycles in a 200 revolution period.
.
Spark plugs or wires failed
l Ignition coil failed
l Crankshaft position piston rings v a l v e s
l Head gasket failed
l C r a c k e d
l Fuel lines and filter failed
l Fuel failed
l failed
l Wiring and connectors failed
l Engine coolant
l Timing belt tooth broken,
l EGR
SCAN TOOL SENSOR READ TESTS (Data list)
05 Engine coolant temperature sensor (Refer to Check the engine coolant temperature circuit.
(Refer to INSPECTION PROCEDURE 38.)
OK
SCAN TOOL SENSOR READ TESTS (Data list)
27 Intake air temperature sensor (Refer to
OK
Check the intake air temperaturecircuit.(Refer to INSPECTION PROCEDURE
SCAN TOOL SENSOR READ TESTS (Data list)
11 MAP sensor reading (Refer to
OK
OK
Check the MAP sensor circuit.(Refer to INSPECTION PROCEDURE 40.)
SCAN TOOL SENSOR READ TESTS (Data list)
Check the following connectors: 66 Oxygen sensor volts (front) (Refer to OK: Repeat and alternately whenidling.
Check the fuel pressure. (Refer to Check the harness wire between the PCM and the cran kshaft
position sensor connector.
l Check the injectors for operation sound.
l Check the injectors for fuel leakage.
l Check the evaporative emission control system.
Check the following items.
l Check the ignition coil, spark plug cables.
l Check the compression pressure.
Check the EGR
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E N G I N E
Scan tool
Cylinder Misfire
Code General scan tool Cylinder Misfire
No.Cylinder MisfireProbable cause
Cylinder Misfire
43,
[Comment]
Backgroundl Spark plugs or ,
l Excessive engine misfire results in increased catal yst temperature.l l . valves
l Severe misfire could cause catalyst damage.
l To prevent catalytic converter damage, the PCM moni tors engine’ misfire.l
H e a d g a s k e t f a i l e d
l The PCM monitors for misfire during most engine ope rating conditions., h e a d
When a misfire is detected, the PCM stores a diagno
stic trouble code and causes thel
Injector failedl to either flash or illuminate continuously during active misfire.
Range of Check
l MAP voltage is less than
l Engine speed is between 2200 and l Engine coolant temperature is greater than l Vehicle speed less than Set Conditionl 1000 Rev Misfire l
Wiring harness and connectors failed
6
The PCM detects misfire in more than 1.6% of the en gine cycles in a 1000 revolutionperiod. 200 Rev MisfireThe PCM detects misfire in more than 15% of the eng ine cycles in a revolution period.
NG
OK
OK
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Check the following items.
l Check the spark plug, spark plug cables.
l Check compression pressure.
l Check the cylinder head gasket and intake manifold gasket for damage.

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

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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