engine MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE (NON-TURBO)>
Scan tool 20
Injector C i r c u i tNo.
27
[Comment]l Open or shorted injector control Backgroundl Open injector
l Grounds for the injector circuits are provided by t he PCM.l (ASD) supply l Battery power is provided through the relay (ASD relay).
l Driver tailedlThis DTC is set if an open or short-circuit conditi on is detected in the control circuit the individual injector.
Range of Check
l Battery voltage: or morel relay (ASD relay): ON
l Engine: 3000 or lessSet Conditionl force is not detected for 3 seconds immediately af ter injectors
Measure at the injector connector lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test
10
relay (ASD relay)
l Voltage between 2 and ground
[Measure with the relay (ASD relay) on]
OK: Battery positive voltage
OK
Check the harness wire between the relay relay) and
the injector connector. Repair,
Measure at the PCM connector 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 17 and ground
OK: Battery positive voltage Check the following
Check the harness between PCM and injector if necessary.
OKNGCheck the following connector: Repair,
OK
Check trouble symptom.
N G
Replace the PCM.
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(NON-TURBO)>
Scan tool 21
Injector Control CircuitNo.
,
Probable cause
27
[Comment]l Open or shorted injector control Backgroundl O p e n i n j e c t o rl Grounds for the injector circuits are provided by t he PCM.
l voitage supply at injector
l Battery power is provided through the relay (ASD l ’ Driver in failed, , lThis DTC is set if an open or short-circuit conditi on is detected in the circuit for
the individual injector. ,
Range of Check
l Battery
or morel relay (ASD relay): ONl Engine: 3000 or less
Set Condition
l force is not detected for 3 seconds immediately af ter injectors . .
SCAN TOOL Actuator test
10 relay (ASD relay)
NG Repair the relay (ASD relay) circuit.
OK: The reiav sound can be heard.
NGCheck the injector. (Refer to Replace
OK
Measure at the injector connector lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test 10
relay (ASD relay) relay isturnedonandoff everyapprox. l between 2 and ground
[Measure with the relay (ASD relay) on]
OK: Battery positive
OK
Check the harness wire between the relay (ASD relay) and
the injector connector. Repair, if necessary.
Measure at the PCM connector
lDisconnect the connector, and measure at the harnes s side.lDisconnect PCM connector A-l 07 and short terminal (67) of
the harness-side connector to ground.
l
between 13 and ground
OK: Battery positive
Check the following connectors:
Check the harness between PCM and injector connecto r. if necessary.
OK
Check the following connector:
OK
NG Repair
Check trouble symptom.
NG
Replace the PCM.
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ENGINE (NON-TURBO)>
Scan tool 25
Code General scan tool
No. Air Control Motor Circuits
25,
[Comment]l Driver circuit shorted to groundBackgroundl Driver circuit shorted to batterylThe idle air stepper motor is used to prevent the engine from at
l shorted to togetheridle.l PCM failed
With the throttle plate completely placing a load on the engine (A/C or power l Shorted motor
steering operation) might cause the engine to stall or run rough.
lAs the PCM anticipates load, it operates the motor, opening the throttle bypass passageand allowing more air into the intake manifold.
l Malfunction of this system cause rough idle and emissions.lThe PCM cannot detect an open circuit or determine if the stepper motor is stuck in
one position.
Range of Check
l Battery
10 or more . .
l ignition switch: ON
Set Condition
lA short or open circuit condition is detected in a motor circuit for 3 seconds.
Check the idle air motor. (Refer to Replace
Check NG Repair
OK
Check trouble symptom.
N G
NG
harness wire between PCM and the Repair
Replace the PCM.
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ENGINE (NON-TURBO)>
Scan tool 27
Code scan tool Throttle Position Sensor Voltage
No. High
24
[Comment] Sensor circuit openBackgroundl position sensor failed
lThe sensor consists of a resistor that provides a to the PCM based S e n s o r g r o u n d c i r c u i t on the position of the throttle blade.l The PCM uses throttle body position information to adjust fuel injector width.
Range of Check
l ignition switch: ON
Set Condition
l Throttle position sensor output remains more than for 1 second.
NGCheck the throttle position sensor. (TPS) (Refer to Replace
OK
Measure at the TPS connector lDisconnect the connector, and measure at the harnes s side.
l Continuity between 1 and ground
OK: Continuity
OK
Scan tool 30
Code General scan tool Engine Coolant Temperature
No.Sensor Voltage Too
22
[Comment]l Sensor shorted to Backgroundl Sensor internally shortedlData from the engine temperature sensor is used in most fuel and spark related
l PCM failed
control functions.
Range of Checkl Ignition switch: ON ,
Set ConditionEngine temperature sensor output remains less than 0.51 for 3 seconds.
Check the wire between We PCM and TPS Repair, if necessary.
NG Check the following connectors: Repair ,
Check trouble symptom.
OKNGCheck the harness wire between the PCM and the TPS connector.
NG
Replace
Replace
(Refer to
OK
Repair
OK
Check trouble symptom.
NG N G
the Repair
temperature sensor connector.
OK
Replace the PCM.
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ENGINE
Scan tool 31 .
Code General scan tool Engine Coolant Temperature
No.Sensor Voltage Too High
22
[Comment]
Backgroundl Sensor signal circuit open
Data from the engine coolant temperature sensor is used in most fuel and spark relatedl
Sensor internally openlcontrol functions.l PCM failedl When DTC is set, the PCM uses a default value as th e engine coolant temperature, andthe vehicle enters the limp-in mode.Range of Checkl Ignition switch: ON ,
Set Condition,lEngine coolant temperature sensor output voltage re mains more than for 3 seconds.
(Refer to
NG Replace
OK
Measure at the engine coolant temperature sensor lDisconnect the connector, and measure at the harnes s side.
l Continuity between 1 and ground
OK: Continuity
OK
OK
NG
NG
Check the harness wire between the PCM and the engi ne coolanttemperature sensor connector. Repair, if
Repair..
.
Check the harness wire between the coolanttemperature sensor connector.
[Comment] OK
Replace the PCM.
NG
Repair
Upstream Stays
Backgroundl
Sensor output voltage is checked.lIf voltage stays at center instead of switching, an open circuit is likely.
Range of Check
l 2 minutes after starting engine
l Engine coolant temperature: More than
Set ConditionNeither rich nor lean condition is detected from th e upstream heated oxygen sensor input.(Voltage is 0.5 volts for 1.5 minutes)
Check the heated oxygen sensor (front). [Refer to
l Heated oxygen sensor (front) Sensor signal circuit l PCM failed
OK. .
NGCheck the following connectors: Repair
Check trouble symptom.
Check the harness wire between Repair
sensor (front) connector.
OK
Replace the PCM.
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ENGINE (NON-TURBO)>
Scan tool 33
General scan tool is Too LongP r o b a b l e
[Comment]
Backgroundl Thermostat fully
l When the engine is started, the engine coolant temp erature The PCM checksl
Engine temperature sensor failedlthat the engine coolant rises the specified value within a sufficient period aft er theEngine coolant temperature
engine is started. improperly connected
l PCM failed
Range of Check
l Vehicle speed: More than 28 mph
l
minutes after starting engine
Set Condition
lEngine coolant temperature does not rise to 71 ,
Replace
(Refer to Replace
Repair
.
NG Repairtemperature sensor connector.
OK
Replace the PCM.
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ENGINE
I Scan tool 35
Code General scan tool
No.No Vehicle Speed Sensor Signal
15
[Comment]
Background
lThe speed sensor serves as a PCM input switching voltage between 0 and 5volts.lOnce the vehicle is in motion and the throttle is open, information from the sensor is
sampled every 11 milliseconds and compared to a min imum threshold equal to 1 mph.
lIf the sensors output voltage indicates a speed higher than this threshold, the sensor
is considered to be operating normally.
lFailure of the sensor would be quite noticeable bec ause the speedometer would fail tooperate.Diagnostic features that depend on the speed sensor may never execute if this component
fails.
of Check Engine coolant temperature: or more Transaxle: Other than or range only). 31 seconds after starting engine Brakes not applied Throffle valve: Open Engine: 1600 or more Difference between the atmospheric pressure and in take manifold pressure:
34 (10 or more Condition Vehicle speed: Less than lmph for 11 seconds
Measure at the speed sensor connector
l Disconnect the connector, and measure at the harnes s side.
l Voltage between 1 and ground
(Ignition switch: ON)
O K :
l Continuity between 2 and ground
OK: Continuity
OK
OK
Check trouble
Open or shorted. circuitS p e e d o m e t e r d a m a g e d Open supply circuit
Open sensor ground circuit
Vehicle speed sensor failed PCM failed
Repair
Check the harness wire between the PCM and the spee d sensor
connector. Repair, if necessary.
N G Check the following connectors: I Repair
SCAN TOOL SENSOR READ TESTS (Data list)
Replace the vehicle speed sensor.
connector.
N G NG
Repair
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ENGINE (NON-TURBO)>
SCAN SENSOR READ TEST list)
65 Vehicle speed sensor
l Is vehicle speed displayed during driving?
No
Check the following
OK
Check trouble symptom.
OK
harness wire module connector.
OK
Yes R e p l a c e t h e P C M .
N G Repair
NG Repair
Check the automatic transaxle control system.
Code General scan tool
No.MAP Sensor Voltage Too Low
14
[Comment]Background
lWhen this code is produced, the MAP sensor voltage has fallen below the minimum accept-able voltage of 0.02 volts.lAs in the situation above, the estimates MAP value to allow the engine to run.
Range of Check
l Engine:
l position sensor output voltage: Less than Set ConditionlMAP sensor output voltage remains less than for 2 seconds.
Probable cause
Open supply circuit Signal circuit shorted to ground Sensor l PCM failed
Measure at the MAP sensor connector lDisconnect the connector, and measure at the harness side.l Voltage between 2 and ground
(Ignition switch: ON)
O K :
OKCheck the harness wire between the PCM and MAP sens or
connector Repair, if
NGCheck the following Repair
OK
Check trouble symptom.
N G NG
Check the harness wire between the PCM and MAP sens or Repairconnector.
OK
Replace the MAP sensor.
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ENGINE
Scan tool 37 ,
Code General scan tool
No. 08 MAP Sensor Voltage Too HighProbable cause
14
[Comment] Signal circuit openBackground Sensor open lThis code is generated when the MAP sensor voltage
exceeds maximum voltage
of 4.7 volts. l
Sensor ground circuit open
Range of Check l
Sensor circuit shorted to voltage
l PCM
l Engine: 1500 l Throttle position sensor output voltage: Less than Set ConditionlMAP sensor output voltage remains less than 4.7 for 2 seconds. .
Measure at the MAP sensor connector Check the following connectors: lDisconnect the connector, and measure at the harnes
s side.
Check the harness wire between the PCM and MAP se&or
connector. Repair, if necessary. ,
N G
Check the following connectors: Repair
OK
Check trouble symptom.
N G
NG
Repairconnector.
OK
Replace the MAP sensor.
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ENGINE Troubleshooting
General scan toolNo Change in MAP From Start to
[Comment]
Background
l The MAP sensor is mounted to intake manifold vacuum .
lThis information provides an important PCM input fo r determining fuel injector pulse wide.lThe sensor should measure a difference in manifold pressure between key ON and after
the engine is running.
Range of Check
l Vehicle is not moving
l
Engine: The engine idle speed is almost identical t o the target idle speed while the engineis idling.
Set Condition
l Diagnostic trouble code (DTC) memory is not deleted even after the ignition switch is
turned off.
l The difference between the two following MAP values is small.
The value immediately after the ignition switch is turned to ON.
The value while the
is at idle for two seconds.
Ice in sensorl Sensor failedl . failed
Measure at the MAP sensor connector l
Disconnect the connector, and measure at the harnes s side.
l Continuity between and ground.
OK: Continuitv
Check the
Check the harness wire between the PCM and the MAP sensor
connector. if
Check the following connectors: Repair
OK
Check trouble symptom.
N G N G
Check the harness wire between the PCM and the MAP
connector.
OK
.
Replace the MAP sensor.
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