Mitsubishi 3000GT 1991, Service Manual

Page: 212 / 1146

FUEL SYSTEM
On-vehicle Inspection of MPI Components
INSPECTION
Using Multi-use
Tester
Function Item No. Data display Check condition Coolant temperature
Standard
value
Data
Drive time*’ 0°C
reading
Engine: Cranking Approx. 53 ms
20°C (68°F) Approx. 29 ms
80°C (176°F) Approx. 7 ms
Function Item No. Data display Check condition
Engine state Standard value
Data
reading
Drive
l
Engine coolant 700 rpm (Idle)
1.9 2.5 ms
perature: 80 to 95°C
(176 to 205°F)
2,000 rpm
1.6 2.2 ms
l
Lamps, electric cooling
fan, accessory units:
To increase
All OFF
When sharp racing is
made
l
Transaxle: Neutral
range for vehicle
with A/T)
l
Steering wheel: Neutral
NOTE
The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.
“2: When coolant temperature is lower than 0°C (32°F). injection is made by four cylinders simultaneously.
“3: When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about
10% longer.
Function
Actuator test
Item No. Drive content
Check condition Normal state
01 No. 1 injector shut off Engine: Idling after
Idle state to change
warm-up
further (becoming less
02
No. 2 injector shut off
(Shut off the injectors stable or stalling)
03
in sequence during after
No. 3 injector shut off engine warm-up,
check
the idling condition)
04 No. 4 injector shut off
05 No. 5 injector shut off
06
No. 6 injector shut off
Using
(1) Run the engine at idle speed.
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform at
the drive side of each injector.
A: Injector
Normal waveform
drive time
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