sensor MITSUBISHI SPYDER 1990 Service Owners Manual

ENGINE Troubleshooting .
Scan tool 138
Code General scan tool
No. Not
25
[Comment]Range of Check
l Engine:
l Vehicle at rest and the brake appliedSet Conditionl speed differs from target idle by 200 for 12 seconds. l
Idle air control motor failed
l motor related circuit .
SCAN TOOL SENSOR READ TESTS (Data list)
12 position (Refer to Check the air control motor. (Refer to
OK
Check the throttle body minimum air flow. (Refer to
Code
No. R e l a y
General scan tool High Speed Radiator Fan Control
[Comment]
Background
lThe high speed radiator fan relay controls the high speed operation of the radiator fan.lOne side of the relay control coil is supplied with 12 volts when the 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/or A/C compressor condition, etc.
Range of Check
l Battery voltage: 10
or more
l Ignition switch: ON
Set Condition
lAn open or shorted condition is detected in the hig h speed radiator fan relay control circuitfor 3 seconds.
Probable cause
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l Relay open or l Ignition switch output lLow speed radiator fan relay control circuit
open or shorted
NGMeasure at the PCM connector Check the radiator fan circuit.lDisconnect the connector, and measure at harness side. Voltage between 69 and ground(Ignition switch: ON),.
OK: Battery positive voltage .,
l
Connect a jumper wire between 69 and ground(Ignition switch: ON)
OK: Radiator fan runs at high speed.
OK
Check the following connector: N G Repair
OK
Check trouble symptom.1
NG
Replace the PCM.

ENGINE (NON-TURBO)>
Scan tool 146
Code General scan too!
No.5 Volts Supply output Low‘
14
[Comment)
l The PCM supplies aregulated B-volts to the and MAP sensor.lThis DTC is set when both the and MAP sensors have the sensing too low of voltage.
Range of Check
l Ignition switch: ON
Set Condition
l
feed circuit drops below 4 volts for over four sec onds.l
supply circuit groundedl
PCM failed
Check harness wire between the PCM the MAP sensor connector. Repair, if necessary.
N G
Measure at the position sensor connector Check the following connectors: lDisconnect the connector, and measure at the harnes s side.
l Voltage between 3 and ground
(Ignition switch: ON)
OK: 4.8
Repair
OK
.
Check harness wire between the PCM and the TPS necessary;
NGCheck the following Repair
OK
Replace the PCM. ,
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E N G I N E
Scan tool 149
Code General scan tool Fuel Level Sending Unit Volts Too
No.Low
42
[Comment]l Sensor signal line is grounded. . Backgroundl Fuel level sensor failedlThe fuel level sensor, which is installed in the fu el tank, informs the PCM of fuel level(amount).Loss of supply. . lThe PCM does not carry out a specific OBD-II monito r when the fuel amount is small
or large.
Range of Checkl Battery positive voltage: 13 15 l Engine is runningSet ConditionsThe fuel level sensor output voltage is less than 0 .1 V.
Check the fuel gauge unit and its circuit. (Refer to GROUP 54
Combination Meters.)
OK1Check the following NG Repair
Check trouble symptom. Check the harness wire between the PCM and fuel lev
el sensor
Scan tool 150
Code General scan tool
Fuel Level Sending Unit Volts Too
No.High
42
[Comment]l Sensor is grounded.Backgroundl Fuel level sensor failedlThe fuel level sensor, which is installed in the fu el tank, informs the PCM of fuel levell Open sensor ground circuit(amount.)lThe PCM does not carry out a specific OBD-II monito r when the fuel amount is small
or large.
Range of Check
l Battery positive voltage: 13
15 l Engine is running
Set Conditions
The fuel level sensor output voltage is less than 4 .5 V.
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Check the fuel gauge unit and its circuit. to GROUP 54 Combination Meters.)
OK
Check the connectors: A-l 06 NG Repair
Check trouble symptom. Check the harness wire between the PCM and fuel lev
el sensor
connector.
the PCM.Repair

ENGINE Troubleshooting
[Comment]
Background
lThe fuel level sensor, which is installed in the fuel tank, informs the PCM of fuel level(amount).lThe PCM does not carry out a specific monitor when the fuel amount is small
or large.
Range of Check
l Battery positive voltage: 13
15 l Engine is running
Set Conditions
The fuel level signal does not change according to the fuel consumption by driving.Probable cause
l
Fuel level sensor failed
l PCM failed
Check the fuel gauge unit and its circuit.
(Refer to GROUP 54 Combination Meters.)
OK
N GCheck the following connectors: A-l 06 Repair
OK
Check trouble symptom.
N G
N G
Check the harness wire between the PCM and fuel lev el sensor Repairconnector.
OK
Replace the PCM.
Scan tool 153
Code General scan tool Battery Temperature Sensor
No.Voltage Too LowI
44
[Comment]
Background
Battery temperature input is used to adjust the gen erator charging rate based upon the ambient
temperature around the battery.
Range of Check
Ignition switch: ON
Set Conditions
The sensor voltage remains less than 0.3
for 3 seconds.
l Battery temperature sensor l PCM
Replace the
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E N G I N E
Scan tool 154
C o d e G e n e r a l s c a n t o o l T e m p e r a t u r e S e n s o r
No.Voltage Too High
44
[Comment]
Backgroundl Battery temperature sensor l PCM failedBattery temperature input is used to adjust the gen erator charging rate based upon the ambienttemperature around the battery.Range of CheckIgnition switch: ON
Set Conditions .
The sensor voltage remains more than 4.9 for 3 seconds.
Replace the PCM.
Scan tool 155
C o d e G e n e r a l s c a n t o o l U p s t r e a m S h o r t e d t o
No. G r o u n d
[Comment]
Background
lWhen the heated oxygen sensor temperature is low, t
he sensor has the same electrical
characteristics as an insulator.
lThe heated oxygen sensor output signal line is rest ricted to That is why the line voltageis approx. when the heated oxygen sensor temperature is low.lIf the heated oxygen sensor output signal line is grounded, its voltage will become low.
Range of Check
l Engine coolant temperature when the engine starts:
or less
l Within three seconds after the engine
Set Conditions
The heated oxygen sensor output signal line is or less.
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l
.
Upstream, heated oxygen sensor failed
Wiring harness and connectors failed PCM failed
NGCheck the harness wire between the PCM and upstream heated Repair
oxygen sensor connector.
OK
Replace the PCM.

,
-- Scan tool 156,I
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 to
No. G r o u n d
21
[Comment]l Downstream heated oxygen Backgroundl harness and connectors lWhen the heated oxygen sensor temperature is low, t he sensor has the same electrical
l PCM failed characteristics as an insulator.lThe heated oxygen sensor output signal line is That is is approx. when the heated oxygen sensor temperature is low.If the heated oxygen sensor output signal line is g rounded, will become lRange of checkl Engine coolant temperature when the engine starts: or lessl Within three seconds after the engine starts
Set Conditions
The heated oxygen sensor output signal line is
or less.
NGCheck the harness I .oxygen sensor connector.. , ,
OK
Replace the PCM.
11
[Comment]Background , connectedlAfter the engine has been started, the PCM maintain s an expected camshaft port l position
Scan tool 157,General scan toolIntermittent Loss of CMP CKP Probable cause
value. connectedlAt every crankshaft leading edge, this value is updated to reflect the expected
.Camshaft position sensor change in the cam level.
l lAt every crankshaft trailing edge, this value is compared to the true port level. sensor improperly lIf there is a disagreement between two values, then the diagnostic code isset.l sensor
Range of Check
l Engine: running
Set Condition
l Cam and crank signals have been out of sync, than times.
N GCheck the following connectors:. A-l 06
OK
__Check no cam sync. signal at PCM. (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE.
Check no crank reference signal at PCM. (Refer to INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
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ENGINE Troubleshooting
INSPECTION PROCEDURE 4
The check engine/malfunction indicator lamp remains
illuminated and never goes out.
[Comment]In cases such as the above, the cause is probably t hat the PCM is
detecting a problem in a sensor or actuator, or tha t one of the malfunctions listed at right has
occurred.
Probable cause
l Short-circuit between the check indicator lamp and l Malfunction of the PCM
SCAN TOOL DTC Refer to
INSPECTION CHART FOR DIAGNOSTIC
Are diagnostic trouble codesoutput? TROUBLE CODES
Measure at the combination meter connector lDisconnect the connector, and measure at the harnes s
side.Check the harness wire between meter and PCM
connector. Repair, if necessary.
l Disconnect the PCM connector.
l Continuity between 51 and ground
OK: No continuity
O K
Replace the PCM.
INSPECTION PROCEDURE 5
Cranks, won’t start Probable cause
[Comment]l Malfunction of the ignition system
In cases such as the above, the cause is probably t hat a spark plugs are fouled defective,l Malfunction of the fuel pump system
or that the supply of fuel to the combustion chambe r is defective.
l Malfunction of the injector system
in addition, foreign materials (water, kerosene, et c.) may be mixed with the fuel.
l Malfunction of the PCM
l Foreign materials in fuel
,
Check battery positiv
OK: 8 or hiaher Check the battery. (Refer to GROUP 54 Battery)
OK
Scan tool: Inspection when no initial combustion oc
curs.
(Refer to INSPECTION PROCEDURE 29.)
OK
Can any sound be heard
.
(Refer to
Yes
Check ignition circuit system.
(Refer to INSPECTION PROCEDURE 28.)
OK
Check the injector control circuit. Carry out proce dures 19, 20, 21, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.,
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
l Check the compression pressure.
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E N G I N E
INSPECTION PROCEDURE 9
Idle speed is high. (Improper idle speed)
[Comment] lIn such cases as the above, the cause is probably that the intake air volume during idle is’ ltoo great. Intake manifold vacuum leak b o d y
SCAN TOOL DTC
Are diagnostic trouble codes output
NO
07 motor (Refer to
NG
Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
Checktheidleaircontrolmotorcircuit.PROCEDURE FOR DIAGNOSTIC TROUBLE
OK
SCAN TOOLSpecial function
“Reset
Check trouble symptoms.
NG
SCAN TOOL SENSOR NGCheck the engine coolant temperature circuit.(Refer to INSPECTION
OK
SCAN TOOL OUTPUT clutch relay (Refer to
OK
NGCheck the switch and compressor clutch relay to INSPECTION PROCEDURE 26.)
Check the throttle body minimum air flow.
(Refer to
INSPECTION PROCEDURE 10
Idle speed is low. (Improper idle speed) Probable ca use
,
[Comment]l control motor In cases such as the above, the cause is probably that the intake air volume during idling is l
Malfunction of the’ throttle body
too small.
SCAN TOOL DTC
YESRefer to INSPECTION CHART FOR DIAGNOSTIC
Are diagnostic troublecodesoutputTROUBLE CODES.
SCAN TOOL Actuator test
07 motor. (Refer to
OK
NG
PROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Special function
“Reset
Check trouble
OK
Check the engine coolant temperature circuit. (Refer to INSPECTION PROCEDURE 36.)
SCAN TOOL INPUT STATE TESTS
list) position switch (transaxle range switch)
(Refer to
OK Checktransaxle range sensorcircuit.
INSPECTION
PROCEDURE 25.)
Check the throttle body minimum air flow.
(Refer to
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E N G I N E
INSPECTION PROCEDURE 12 , .
. .
When the engine is hot, it stalls at idle. (Die out )
[Comment]l Malfunction of the ignition In cases such as the above, the cause is probably t hat ignition system, mixture, idle l
air control motor or compression pressure is defect ive.Malfunction control M a l f u n c t i o n o f t h e s y s t e m In addition, if the engine stalls, the cause
mayalso be a defective connector contact.l into intake system
l Improper connector contact
W ere the battery terminals disconnected recently
NO
YES After warming-up, let the engine run at idling for 10 minutes.
SCAN TOOL DTC
Are diagnostic trouble codes output?
NO
SCAN TOOL Actuator test
07 motor. (Refer to
OK YES
N G
Refer to INSPECTION CHART FOR DIAGNOSTICTROUBLE CODES.
Checktheidleaircontrolmotorcircuit. INSPECTIONPROCEDURE FOR DIAGNOSTIC TROUBLE CODE
SCAN TOOL Special function
“Reset
Check trouble symptoms.
NG
Check the injector for operation sound.
(Refer to Check the injector control circuit. Carry out proc edures 20, in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.
Does the engine stall right
released
NO.
Does the engine stall easily again
YES
Scan tool: Inspection when engine stalls when the e ngine
is warm and idling (Refer to INSPECTIONPROCEDURE 33.)
OK
Check the throttle body minimum air flow (Refer to
While carrying out an intermittent malfunction simulation test (Refer
to GROUP 00 How to Cope with Intermittent Malfunctions), check
for sudden changes in the signals shown below.
l Crankshaft position sensor and
l MAP sensor signal Fuel pump signall Injector drive signal l power supply voltage
Check the following items.
l
Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the injectors.
l Check the compression pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.
INSPECTION PROCEDURE 13
The engine stalls when accelerating. (Pass out) Probable cause
[Comment]l
Injectors failedIn cases such as the above, the cause is probably m isfiring due to a weak spark, or an inappropriatelMalfunction of the ignition system
air/fuel mixture when the accelerator is depressed.
YESRefer to INSPECTION CHART FORDIAGNOSTIC
Arediagnostic trouble codes outputTROUBLE CODES.
NO
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clogged injectors

ENGINE (NON-TURBO)>
INSPECTION PROCEDURE 14. .. .
The engine stalls when decelerating.P r o b a b l e c a u s e
[Comment]In cases such as the above, the cause is probably t
hat the intake air volume is insufficient due
to a defective idle air control motor system. l Malfunction of the system
W ere the battery terminals disconnected recently?YES After warming-up, let the engine run at idling for
SCAN TOOL DTC
Are diagnostic trouble codes output?
OK
Refer to I N S P E C T I O N FOR TROUBLE CODES.. .
SCAN TOOL SENSOR07 Throttle position (Refer to
NO
NGCheck the throttle position sensor circuit.
(Refer to INSPECTION PROCEDURE 43.)
Check the following items. l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the throttle body minimum air flow.
INSPECTION PROCEDURE 15
Hesitation, sag or stumble
[Comment]In cases such as the above, the cause is probably t hat ignition system, air/fuel mixture or
compression pressure is defective.
Probable cause
Malfunction of the ignition Malfunction of air-fuel ratio control l Malfunction of the fuel supply l of the EGR. solenoid l P o o r
Are diagnostic trouble
codes output
Check the injectors for opNG
(Refer to Check the injector control circuit. out procedures 20, 21, in’ INSPECTION PROCEDUREFOR DIAGNOSTIC TROUBLE CODES”.
Scan Tool: Inspection when hesitation, sag, stumble or pooracceleration occur. (Refer to INSPECTIONPROCEDURE 34.)
OK
Check the fuel pressure. (Refer to
OK
Check the following items.l Check the ignition coil, spark plugs, spark plug ca bles.
l Check the EGR system.
l Check the compression pressure.
l Check the fuel filter or fuel line for clogging.
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