engine MITSUBISHI SPYDER 1990 Service Repair Manual

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 (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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I E N G I N E
PROBLEM SYMPTOMS TABLE (FOR YOUR
ItemsSymptom
StartingWon’tThe starter is used to crank the engine, but there is no combustion
within the cylinders, and the engine
Fires up and diesThere is combustion within the cylinders, but then the
stalls..
Engine starts after cranking a while.Hard starting
Idling
stability
HuntingEngine speed doesn’t constant; idle.
Usually, a judgement can be
upon the of
tachometer pointer, and the vibration transmitted to the
wheel, shift lever, body, etc. This is rough idle.
Rough idle
The engine doesn’t idle at the usual correct Speed. ”
The engine stalls when the foot is taken ‘from
pedal,
regardless of whether
vehicle is moving or not.
Incorrect idle speed
Engine stall (Die out)
The engine stalls when the accelerator pedal is dep ressed
is being used.
Engine stall (Pass out)
Hesitation“Hesitation” is the delay in response of the vehicle speed (engine
speed) that occurs
accelerator is depressed in order to
accelerate from the speed at which the vehicle is
temporary drop in vehicle speed (engine speed)
Serious hesitation is called “sag”. (Refer to 1)
Poor acceleration is inability to obtain an
to the degree of throttle opening, even though acce leration is smooth,
the inability to reach maximum speed.
acceleration
Engine speed increase is delayed when the pedal is
depressed for acceleration. (Refer to Fig. 2)
feeling of a comparatively large impact or when the
is accelerated or decelerated.,
is acceleration and deceleration feel usually at steady,
hrottle cruise. Most notable under light loads.
sharp sound like a hammer striking the cylinder wa lls during driving
which adversely affects driving.
condition in which the engine continues to run after the ignition
is turned to OFF. Also called “Dieseling”.
on
Fig.1Hesitation
Hesitation
Vehicle
speed
Fig. 2
Vehicle
speedNormal
Idling Stumble
ITimeTime
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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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