Mitsubishi 3000GT 1991 Service Manual page 179

FUEL SYSTEM
INSPECTION
Using Multi-use
Tester
Function Item No. Data display
Data reading 22
NOTE
actual engine speed.
Function Item No. Data display
Data reading
22
5v
f - l
Normal waveform
Check condition
Cranking
Engine cranking
l
speed Tachometer connected and multi-use tester
l
(check on and off of
primary current of
ignition coil by
tachometer)
Check condition
Idle speed Engine: Running at
l
idle
Idle position switch:
l
ON
Using Oscilloscope
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform.
Check content
Compare cranking speed Indicated speed
to agree
reading
Coolant temperature
At -20°C (-4°F) 1,300 - 1,500 rpm
1,250 - 1,450 rpm
At 0°C (32°F)
1 ,I 00 - 1,300 rpm
At 20°C (68°F)
At 40°C (104°F)
At 80°C (176°F) 600 - 800 rpm
at idle speed.
Normal state
Standard value