Mitsubishi 3000GT 1991, Service Manual

Page: 179 / 1146

FUEL SYSTEM
On-vehicle Inspection of MPI Components
INSPECTION
Using Multi-use
Tester
Function Item No. Data display Check condition Check content
Normal state
Data reading 22 Cranking
l
Engine cranking Compare cranking speed Indicated speed
speed
l
Tachometer connected and multi-use tester
(check on and off of to agree
reading
primary current of
ignition coil by
tachometer)
NOTE
The tachometer indicates a third of the actual engine speed. Therefore, 3 times the tachometer indication is the
actual engine speed.
When the tachometer is set to the
range, it indicates actual engine speed.
Function Item No. Data display
Check condition Coolant temperature Standard value
Data reading
22
Idle speed
l
Engine: Running at At (-4°F) 1,300 1,500 rpm
idle
l
Idle position switch:
ON
At 0°C (32°F)
At (68°F)
At 40°C (104°F)
At 80°C (176°F)
1,250 1,450 rpm
1 00 1,300 rpm
600 800 rpm
5v
f - l
N o r m a l w a v e f o r m
Using Oscilloscope
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.
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