MITSUBISHI SPYDER 1990 Service Repair Manual

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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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 . .
Scan tool 96
[Comment]l The TCM outputs no messages.lCommunication line between failed..
.
l PCM failed
CHECK BY SCAN TOOL
l Can the scan tool communicate with the TCM?
, l Disconnect the PCM connector. me
l Can the scan tool communicate with the TCM?
,No
Replace PCM.
, N G C h e c k t h e f o l l o w i n g .
Measure at the data link connector. l
Disconnect the PCM connector.
l Voltage between 27 and ground (Ignition switch: ON)
O K :
l Voltage between and ground (Ignition switch: ON)
O K :
l Resistance between 27 and 28
O K :
OK
Measure at the data link connector. l Connect the PCM connector.
l Disconnect the TCM connector.
l Resistance between 27 and
O K :
OK
Check the harness wire between the PCM and the
OK.
Replace the TCM.
Replace the PCM.
Check the following connectors:
OK
NG Repair
Check trouble symptom.
N G
the PCM.I
OK
Check trouble symptom.
Replace the TCM.
N G
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ENGINE (NON-TURBO)>
Scan tool 101
Code General scan tool
No.Fuel Pump Relay Control Circuit
42
[ C o m m e n t ]l Relay open or shortedBackgroundFuel pump relay control open l The fuel pump relay control the battery voltage sup plied to the fuel pump.lThe PCM provides a ground path for the fuel pump re lay. I n o p e r a t i v e P C M ,
l This DTC indicates an open or short-circuit in the control Range of Check Battery voltage: 10 or more
l Ignition switch: ON
Set Conditionl Open or short circuit is detected in fuel pump rela y control circuit for 3 seconds.
NGCheck the fuel pump Replace
OK,
Measure at the fuel pump relay connector Check the following connectors: lDisconnect the connector, and measure at the harnes s side.
l Voltage between 6 and ground
OK: Battery positive voltage
OK
Check the harness wire between the pump connector. Repair, if necessary.
N G
Check the following connector: Repair
OK
Check trouble symptom.
NG
Check the harness wire between theconnector.
NG Repair
OK
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 103
Code General scan tool
No.Upstream Failure
21
[Comment]
Background
l The PCM continues to monitor this system after the key is OFF.
l The PCM waits some periods to allow the heated oxyg en sensors to cool.
l Once the PCM calculates that the heated oxygen sens or is cooled, it energizes the
relay (ASD relay) and tests for the heated oxygen sensor operation.
Range of Check
5 seconds or more after turning the ignition switch to OFF. Battery positive voltage: or morelThe heated oxygen sensor output line voltage rises by 0.49 or more within 144 secondsafter turning the ignition switch to OFF. The initial rise of the output line voltage is less than 1.57 V.Set ConditionHeated oxygen sensor’s circuit does not show the ap propriate decrease of voltage the test.
l Heated oxygen sensor heater open l harness and connectors ,
Measure at the heated oxygen sensor (front) connect or l
Disconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test
relay (ASD relay) Check the following connector: everyapprox. 1. Voltage between 4 and ground
[Measure with the relay (ASD relay) on]
OK: Battery positive voltage Check the harness wire between the and
2. Continuity between 3 and ground the heated oxygen sensor connector. if
OK: Continuity
2. NG Check the harness wire between the heated oxygen sensor and
OKthe ground. Repair, if necessary.
NGCheck the followingconnect Repair
OK
Check trouble symptom.
NG
Replace the heated oxygen sensor (front).
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E N G I N E
[Comment]
Background
l The PCM continues to monitor this system after the key is OFF.
l The PCM waits some periods to allow the heated oxyg en sensors to cool.
l Once the PCM calculates that the heated oxygen sens or is cooled, it energizes the
relay relay) and tests for the heated oxygen sensor operation.
Range of Check
l 5 seconds or more after turning the ignition switch to OFF.
l Battery positive voltage: 10
or morelThe heated oxygen sensor output line voltage rises by 0.49 or more within 144 secondsafter turning the ignition switch to OFF. The initial of the output line voltage is less than 1.57 V.Set ConditionHeated oxygen sensor’s circuit does not show the ap propriate decrease of voltage the test.
1. NG
Measure at the heated oxygen sensor (rear) connecto r
lDisconnect the connector, and measure at the harnes s side.
SCAN TOOL Actuator test 10
relay (ASD relay) everyapprox. 1. Voltage between 3 and ground [Measure with the relay
(ASD relay) on]
OK: Battery positive voltage
2. Continuity between 4 and ground
OK: Continuity
OK
2. NG l
Heated oxygen sensor heater
l harness and
. .
Check the harness wire between (ASP the heated oxygen sensor
Check the harness wire between the heated oxygen s ensor and
the ground. Repair, if necessary.
NG Repair
Check trouble symptom.
OK
NG
Replace the heated oxygen sensor (rear).
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