engine MITSUBISHI 3000GT 1991 Owners Manual

13-16FUEL SYSTEM - Troubleshooting
CHECK CHART CLASSIFIED BY PROBLEM SYMPTOMSstepper motor type)
0:Warmen,gine (number inside indicates check order)Cl: Cold engine (number inside indicates check order): Non TurboCT>: TurboTSB Revision

FUEL SYSTEM - Troubleshootina13-17
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
I;
L
/
L/
Items
Won’t start(no initial combustion)-g Starting problem
2(i;il;i combustion, then
Symptom
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
There is combustion within the cylinders, but then the engine soon stalls.(Starting takes a long
time.)Engine won’t start quickly.
Idling instability
(Rough idling)Engine speed doesn’t remain constant; changes during idling.Usually, a judgement can be based upon the movement of the tachometer
>.rpointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
EThis is called rough idling.
s0
Incorrect idling speedThe engine doesn’t idle at the usual correct speed.
F.-=e-ImpDr;p;ertidling continuityThis non-continuity of idling includes the following elements.(1) Die outPass out. . . . . The engine stalls when the foot is taken from the accelerator pedal,regardless of whether the vehicle is moving or not.(2) Pass out . . The engine stalls when the accelerator pedal is depressed or while
it is being used.
Hesitation
Sag
“Hesitation” is the delay in responseHesitation
of the vehicle speed (engine rpm) thatLNormaloccurs when the accelerator pedal is
depressed in order to accelerate from---
the speed at which the vehicle is nowx\a,r- ,
traveling, or a temporary drop in vehi-g Initialv) accelerator**’ ,8’ /cle speed (engine rpm) during such+ pedal/,’ /
’
acceleration.2 depression
Serious hesitation is called “sag”.2
1“*’.’
/’ ,’I&L-e**’Ii Sag
Poor acceleration
Time1 FU022:
Poor acceleration is inability to obtain an acceleration corresponding to thedegree of throttle opening, even though acceleration is smooth, or the inability toreach maximum speed.
0, Stumble.F
‘iIn
Engine rpm response is delayed when
the accelerator pedal is initially.
depressed for acceleration from thestopped condition.
$Normal
x
:Initial
3acceleratorI//
c
-7
pedal2 depression,#’,
4,/Idling *--’Stumble
Shock
cTime1 FUO22L
The feeling of a comparatively large impact or vibration when the engine isaccelerated or decelerated.
SurgeThis is repeated surging ahead during constant speed travel or during variable
speed travel.
Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.TSB Revision

13-18FUEL SYSTEM - Troubleshooting
CIRCUIT DIAGRAM
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IKX35-AC-R0502-NY
TSB Revision

FUEL SYSTEM - Troubleshooting
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UNIT
PTSB Revision

13-20FUEL SYSTEM - Troubleshooting
CRANK ANGLEAND TOP DEAD z
BCENTER SENSOR $j
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SENSOR
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1 TSB Revision

FUEL SYSTEM - Troubleshootinn13-21
ENGINE
CONTROL
RELAY
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3-131
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IDLE SPEED sgCONTROL
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A-22@&TSB Revision

13-22FUEL SYSTEM - Troubleshooting
J/B
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UNITKX35-AC-R05025-NY
TSB Revision

FUEL SYSTEM - Troubleshootina13-23
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ENGINE
CONTROL
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1 TSB Revision
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13-24FUEL SYSTEM - ‘Troubleshootinn

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EaaTSB Revision

FUEL SYSTEM - Troubleshootinn13-25
ENGINE
CONTROL
RELAYIGNISWITIN(IGl)
1234
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1 TSB Revision