1990 MITSUBISHI SPYDER check engine

,
-- 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 (NON-TURBO)>
Scan tool 160
Code General scan tool EVAP Leak Monitor
No.Detected
31
[Comment]
Background
l The PCM monitors that the fuel tank, purge lines, e tc. are well.
l
ventilation solenoid with the canister ventilation valve (incorporated in the lIf the fuel tank and purge lines are sealed the pressure will rise well by the solenoid specific timeslAfter the pressure rises well, the diaphragm inside the solenoid will not work any more.lIf the purge air leaks slightly, the solenoid will be activated more than specific times.
Range of Check, Set Condition
l The solenoid has been activated more than specific times.
‘ P r o b a b l e
I,
l Fuel tank cap screwed on l tank and purge lines, l Evaporative emission failed
l
l PCM failed’
NGCheck the evaporative Replace
(Refer to GROUP Emission Control System.)
OK
Check the evaporative emission purge solenoid.NG Replace
(Refer to GROUP 17 Emission Control System.)
OK
Check the fuel tank and purge line for leakage.
Scan tool 161
Code General scan tool EVAP Leak Monitor Large Leak
No. Detected
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[Comment]
l The PCM monitors that the fuel tank, purge lines, e tc. are well.
l
ventilation with the canister ventilation valve (incorporated in the solenoid) lIf the fuel tank and purge lines are sealed correct ly, the pressure will well by the solenoid specific times.lAfter the pressure rises well, the diaphragm inside the solenoid will not work any more.lIf the purge air leaks excessively, the solenoid should be activated much more than specific
times.
of Check. Set Condition
l been activated much more than specific times.
Probable cause
l Fuel tank filler cap screwed on lFuel tank and purge seated
l Evaporative solenoid
failed
l
l PCM ,
Check the evaporative emission ventilation solenoid .
(Refer to GROUP 17 Emission Control System.) Replace
NGCheck the evaporative emission purge solenoid. Replace
(Refer to GROUP 17 Emission Control System.)
OK
Check the fuel tank and line for I

ENGINE (NON-TURBO)>
Scan tool 183
Code General scan tool Evaporative Emission
No.tion Solenoid Circuit
31
[Comment]l Open or short control drcuitBackgroundl Open fused ignition l The PCM provides a switched ground path to the sole noid. Open or shorted solenoid lThis DTC indicates an open or short-circuit condition in the evaporative emission l PCM failed
solenoid control circuit.
Range of Check
l Battery voltage:
or more
l Ignition switch: ON
ConditionlOpen or short circuit is detected in the evaporativ e emission ventilation solenoid for 3seconds.
N GMeasure at the evaporative emission ventilation sol enoid connectorCheck the following connectors:
lDisconnect the connector and measure at the harness side.
l Voltage between 2 and ground
(Ignition switch: ON)
OK: Battery positive voltage
OKCheck the harness wire between ignition switch and emission ventilation solenoid connector. Repair,if
NGMeasure at the PCM connector Check the following connectors: lDisconnect the connector and measure at the harness side.
l Voltage between 77 and ground
(Ignition switch: ON)
OK: Battery positive voltage
OKCheck the harness wire between PCM and emissionventilation solenoid connector. Repair, if necessar y.
Check the following connector: Repair
Check trouble symptom.
N G
Replace the PCM.
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ENGINE (NON-TURBO)> Troubleshooting’
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Communication with all systems is not possible.1tion with scan,
tool is
Communication with PCM only is not possible.2
malfunctionThe check engine/malfunction indicator lamp does no t illuminate right after the ignition
indicator lamp switch is turned to the ON position.3
and related
parts The check engine/malfunction indicator lamp remains
illuminated and never goes 4
Cranks, won’t start
5
StartingFires up and dies6
Hard starting7
Idling stability Unstable idle. (Rough idle, hunting)6
(Improper
Idle speed is high. (Improper idle speed)9idling)Idle speed is low. (Improper idle speed)1 0
When the engine is cold, it stalls at idle (Die out )11
stabilityWhen the engine becomes hot, it stalls at idle. (Di e 12
(Engine stalls)Th engine stalls when accelerating. (Pass out)13
The engine stalls when decelerating.14
Hesitation, sag or stumble15
Acceleration shock1 6
Deceleration shock 17DrivingPoor acceleration 16
Surge19
Knocking 20
21
Too high CO and HC concentration when idling22
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ENGINE (NON-TURBO)>
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1Communication with scan tool is not possible. (Comm unication
with all systems is not possible.)
The cause is probably a defect in the power supply system (including ground) for the on-board
Measure at the data link connector
OK
. Check the following connectors: 5 7 5
Check troubleNG. Check between and
Replace the scan tool.
. .
INSPECTION PROCEDURE 2
Scan tool communication with PCM is not possible.P r o b a b l e
[Comment]One of the following causes may be suspected. l No power supply to PCM
* Defective ground circuit of PCM
l Defective PCM
l Improper communication line between PCM and scan to olMalfunctionof- power supply o f lOpen circuit between PCM and data link con-
Check the following connectors:
OK
NG Repair
Check trouble symptom.IN G
Check the harness wire between PCM and data link connector.
OK
Check the power supply and ignition circuit.
(Refer to INSPECTION PROCEDURE 23.)
N G Repair
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INSPECTION PROCEDURE 3,
T h e c h e c k i n d i c a t o r . l a m p n o t
illuminate right after the ignition switch is turned to the
position. ,
[Comment]l bulbThe PCM causes the check engine/malfunction indicator lamp to illuminate for three seconds, l Defective check engine/malfunction immediately after the ignition switch is turned to ON.
If the check engine/malfunction indicator lamp does not illuminate immediately after the ignition llamp circuit of the switch is turned to ON, one of the malfunctions lis
ted at right probably occurred.
NG
10Battery voltage (Refer toCheck the power supply and ignition circuit.
(Refer to I N S P E C T I O N
Measure at the PCM connector,
OK: The check engine/malfunction indicator lamp
NG
Check a burnt-out bulb.
OK
N G Replace
Measure at the combination meter connector
lDisconnect the connector, and measure at the harnes s
side.
lVoltage between 10 and ground (Ignition switch: ON)
OK: Battery positive voltage
OK
Replace the PCM.I
NGCheck the check engine/malfunction indicator power supply circuit. Repair, if necessary.; ,
Check the
OK
Repair
Check trouble symptom.I
Check the harness wire between combination meter an d
PCM connector. Repair, if necessary.
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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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ENGINE (NON-TURBO)=,
INSPECTION PROCEDURE 6
Fires up and dies.P r o b a b l e
[Comment]l of the ignition system
In such cases as the above, the cause is probably t hat the spark plugs are generating sparkslbut the sparks are weak, or the initial mixture for starting is not appropriate.Malfunction of the injector system
l Foreign fuel
l Poor compression
l
of the PCM
Check the battery. (Refer to GROUP 54
OK:8 or higher
Scan tool: Inspection when incomplete combustion oc curs.(Refer to INSPECTION PROCEDURE 30.)
OK
Canany sound be heard (Refer to
Yes
Check the injector control circuit. Carry out procedures in “INSPECTION PROCEDURE
FOR DIAGNOSTIC TROUBLE CODES”.
Is starting good if the engine is cranked with the acceleratorpedal slightly depressed?
No
motor circuit INSPECTION
PROCEDURE FOR
TROUBLECODE
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 fuel lines for
l Check if foreign (water, alcohol, etc.) got into fuel.
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INSPECTION PROCEDURE 7
Hard startingIProbable cause I
[Comment]l Malfunction of the ignition systemIn cases such as the above, the cause is probably t hat the spark is weak and ignition is difficult,lMalfunction of the injector system
the initial mixture for starting is not appropriate , or sufficient compression pressure is not beinglInappropriate gasoline useobtained.l P o o r
Check battery positive vo
OK: 8 or higherOK
Scan tool: Inspection when incomplete combustion oc curs.
(Refer to INSPECTION PROCEDURE 30.)Check the battery. (Refer to GROUP 54
Battery)1
Can any sound be heard fro
No Check the injector control circuit. Carry out proc
edures 19, 20, 21,
(Refer to in “INSPECTION PROCEDURE
YesFOR DIAGNOSTIC TROUBLE CODES”.
Check the following items.
l Check the ignition coil, spark plugs, spark plug ca bles.
l Clean the
l Check the pressure.
l Check if foreign materials (water, alcohol, etc.) g ot into fuel.