engine MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE (TURBO)
AND ENGINE> Troubleshooting . .
Observation conditions (pattern changes with engine changes.)
.
id
10--
0Time
Wave pattern observation points
Check to be sure that cycle time becomes shorter and the frequency increases when speed
is increased.
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Examples of abnormal wave patterns
l Example 1
,Cause of problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the en gine
is not started.
l Example 2
Cause of problem
Damaged rectifier or vortex generation column .
Wave pattern characteristics
Unstable wave pattern with non-uniform frequency. H ow-
ever, when an ignition leak occurs during acceleration,
the wave pattern will be distorted temporarily, eve n if
the volume air flow sensor is normal.

ENGINE (TURBO)
AND ENGINE>
CAMSHAFT POSITION SENSOR AND
POSITION SENSOR
Measurement method
1.Connect the analyzer special patterns pickup to
position sensor terminal 2.
2.Disconnect the crankshaft position sensor
connect the special tool (test harness: in.
between.
3.Connect the analyzer special patterns pickup to cra nkshaft
position sensor terminal 2.
Alternate method (Test harness not available)
1. Connect the analyzer special patterns pickup. to ECM
terminal 88. (When checking the camshaft position sensor.
signal wave pattern)
2. Connect the analyzer special patterns pickup to ECM’
terminal 89. (When checking the crankshaft position sen-
sor signal wave pattern)
Standard Wave Pattern
Observation conditions
Camshaft position sensor
connector
Standard wave pattern
Crankshaft
Crankshaft
position sensor
position sensor
output wave
output wave
pattern
pattern
Camshaft position
Camshaft position
sensor output
sensor output
wave pattern
wave pattern
Special patterns
Pattern height LowI
Pattern selector DisplayI
Engine
I
TDC: Top dead centerNo. TDCNo. TDC No. TDCNo. TDC
Wave Pattern Observation Points
Check that cycle time
becomes shorter when the engine speed increases.
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ENGINE (TURBO)
AND
ENGINE> Troubleshooting
Analyzer
Examples of abnormal wave ,
l Example 1
Cause problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the en gine
is not started.
l Example 2
Cause of problem
Loose timing belt
Abnormality in sensor disk
Wave pattern characteristics
Wave pattern jumps to the left or right.
INJECTOR
Measurement method
1.Disconnect the injector connector and connect the s pecial
tool (test harness:
348) in between. (Both
on the engine control module side and the terminal
on the power supply side should be connected.)
2.Connect the analyzer special patterns pickup to the test
harness clip on the engine control module side.
Alternate method (Test harness available)
1. Connect the analyzer special patterns pickup’
terminal 1 to analyze the cylinder, connection termi-
nal 2 to analyze the cylinder, connection terminal
14 to analyze the
cylinder and connection terminal
15 to analyze the
respectively.
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ENGINE (TURBO)
AND ENGINE> Troubleshooting
Standard Wave Pattern
Observation conditions
FunctionSpecial patterns
Pattern height
Variable
Standard wave pattern
Variable knobAdjust while viewing
Pattern selector Display
Engine
.
5 .
Drive signal: ON Drive signal: OFF
27 FU 1202
Wave pattern observation points Point A: Height of injector coil induced voltage
Contrast with standard wave pattern
Injector coil induced voltage is low or doesn’t app ear at all.Probable cause
Short in the injector solenoid
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--- When idling When racing
Point B: Injector drive time
lThe injector drive be synchronized with
tool tester display.
lWhen the engine is suddenly raced, the drive time w ill
be greatly extended at first, but the drive time wi ll soon
match the engine speed.

Analyzer
STEPPER MOTOR Engine (Turbo)>
Measurement method
1. Disconnect the stepper motor connector, and connect
the special tool (test harness:
in between.
2. Connect the analyzer special patterns pickup to the step-
per motor-side connector terminal (red clip on the special
tool), terminal 3 (blue clip), terminal 4 (black clip) and
terminal 6 (yellow clip) respectively.
Alternate method (Test
not available) .
1. Connect the analyzer special patterns pickup to ECM
terminal 4, connection terminal 5, connection termi nal
17, and’ connection terminal 18 respectively.
Standard Wave Pattern
Observation conditions
Function Special patterns
Pattern height
Pattern selector
Engine conditionHigh
Display
When the engine coolant temperature is or below,
OFF to ON (without starting the engine)..
While the engine is idling, turn the A/C switch to ON.. .Immediately after starting the warm engine (approx. 1 minute).
Standard wave pattern
The wave patternappears for aninstant, but soon
30disappears.
Stepper motor
10
control signal
wave pattern
Coil reverse voltage(Approx. 3
(Point]
induced voltage from the turning
Time
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ENGINE (TURBO)
AND ENGINE>
Analyzer
IGNITION COIL AND IGNITION
l Ignition coil primary
Refer to GROUP 16 Ignition System.
l Ignition power transistor control signal.
Measurement method
1. Disconnect the ignition power transistor connect or,
connect the special tool (test harness:.
tween. (All terminals should be connected.)
2.Connect the analyzer special patterns pickup to
tion power transistor connector terminal 2 No.
3) and terminal 7 (No. 1
No. 4)
A l t e r n a t e m e t h o d ( T e s t
1. Connect the analyzer special pickup to ECM
terminal
and connection terminal 23 respectively.
Standard Wave
Observation conditions
Special patterns
Pattern height
Pattern selector
Engine
D i s p l a y
Approx. 1,200
Standard wave pattern
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wave pattern
6 6: Spark advanceangleWave build-up section
Ignition power
transistor con-
trol signal wave
OFF ON
Dwell section Time

Wave pattern observation points
Point:Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wavepattern
examples 1 and 2.)
Condition of wave pattern build-up section and maxi mum voltageProbable cause
Rises from approx. to approx. at the top-rightNormal
rectangular wave Open-circuit in ignition primary circuit
Rectangular wave at power voltage Ignition power transistor malfunction
--- Normal wave pattern
-- Normal wave pattern
Examples of abnormal wave
l
Example 1
Wave pattern during engine cranking
of problem
Open-circuit in ignition primary circuit
Wave pattern , ,
Top-right part of the build-up section cannot
voltage value is approxiinatety too
l Example 2
Wave pattern during engine cranking
Cause of problem
Malfunction in ignition power transistor
Wave pattern characteristics
Power voltage results when the ignition power trans istor
is ON.
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THROTTLE BODY
CLEANING
1.
2.
Start the engine and warm it up the coolant is
to higher and then stop the
Remove the air intake hose from the
.
3.
4.
5.
6.
7.
8.
9.
Plug the bypass passage inlet of
Caution
Do not allow cleaning solvent to enter the bypass
passage.
Spray cleaning solvent into the valve through throttle’
body intake port and leave it for about 5
Start the engine, race it several times and idle it for about
1 minute. If the idling speed becomes unstable (or if the
engine stalls) due to the bypass passage being plug ged,,
slightly open the throttle valve to keep the
If the throttle valve deposits are removed, repeat
steps 4 and 5.
U n p l u g t h e p a s s a g e i n l e t .
Attach the air intake hose.
Use the scan tool to erase the
code.
10. Adjust the basic idle speed. (Refer to
N O T E If the engine hunts while idling after
of the
basic idle speed, disconnect the cable from the battery
for 10 seconds or more, and then reconnect it and r un
the engine at idle for about
minutes.

Terminal 2Terminal 4
--
9. When not using the scan tool, proceed as follows :
(1) Disconnect the throttle position connectors
and connect the special tool.
set, be-
tween the disconnected connectors.
(2) Connect a digital voltmeter
throttle
tion sensor terminal 2 (sensor output) and
4 (sensor ground.)
10. Turn the ignition switch ON (but do not start th e engine).:
11. Check the throttle position sensor voltage.
value:
__
12. If there is a deviation from the’ standard value, check
the throttle position sensor and the
13. Remove the feeler gauge.
14. Switch OFF the ignition switch.
.
,
. .

SPEED
NOTE
1.The standard idle speed by,
engine speed the
and there should usually for readjustment.
2. The adjustment, after first:
confirming that the spark plugs; the
air control servo, the compression pressure,
all normal.
1.. The vehicle should be prepared as follows before the
i n s p e c t i o n a n d a d j u s t m e n t .
lEngine coolant temperature:
l Lights, cooling fan and accessories: OFF
‘2.
l Transaxle: Neutral (A/T for range)
Connect the scan tool to the data link connector
N O T E
When the scan tool is connected, the diagnostic tes t mode
control terminal should be grounded.
3. Start the engine and run at idle.
4. Select the item No. 30 of the SCAN TOOL (MUT-II)
Actuator test.
NOTE
This holds the motor at the basic step to adjust the
basic idle speed.
5. Check the idle speed. Standard value: 750
50
NOTE
1. The engine speed may be 20 to 100 lower
than indicated above for a new vehicle [driven appr oxi-
mately 500 km (300 mile) or less], but no adjustment
is necessary.
2.If the engine stalls or the is low even though
the vehicle has been driven approximately 500 km (300 mile) or more, it is probable that deposits ar e
adhered to the throttle valve, so clean it. (Refer to