Mitsubishi 3000GT 1991 Service Manual page 212

FUEL SYSTEM
INSPECTION
Tester
Using Multi-use
Item No.
Function
Data
reading
Function Item No.
Data
reading
NOTE
"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.
Item No.
Function
Actuator test
Normal waveform
drive time
Check condition
Data display
Drive time*' Engine: Cranking
Data display Check condition
Drive time*3 Engine coolant tem-
l
perature: 80 to 95°C
(176 to 205°F)
Lamps, electric cooling
l
fan, accessory units:
All OFF
Transaxle: Neutral
l
with A/T)
Steering wheel: Neutral
l
Drive content
01
No. 1 injector shut off
02
No. 2 injector shut off
03 No. 3 injector shut off
04 No. 4 injector shut off
05 No. 5 injector shut off
06 No. 6 injector shut off
Using Oscillqscope
(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.
TSB Revision
Coolant temperature
0°C (32'F)*'
20°C (68°F)
80°C (176°F)
Engine state
700 rpm (Idle)
2,000 rpm
When sharp racing is
made
Check condition
Engine: Idling after
warm-up
(Shut off the injectors
in sequence during after
check
engine warm-up,
the idling condition)
value
Standard
Approx. 53 ms
Approx. 29 ms
Approx. 7 ms
Standard value
1.9 - 2.5 ms
1.6 - 2.2 ms
To increase
Normal state
Idle state to change
further (becoming less
stable or stalling)