Mitsubishi 3000GT Service Manual page 263

INSPECTION
Using Scan Tool
Item
Function Data display
No.
Ignition
Data reading 44
advance
<Ignition Timing Adjustmernt Mode>
Item
Function
present between ignition
timing adjustment termi-
nal and ground
Item No.
Function
17
Actuator test
Oscillo 1
1
. ..) +- .--
Normal waveform z,,3,,02,,
Oscillo 2
1
Normal waveform
MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
Check condition
Engine: Warming up 700 rpm (Idle) 7-23"BTDC
l
Timing light: Set (set
l
timing light to check
actual ignition timing)
Check
Data display
condition
l Engine:
Idling
Drive
Set to ignition timing ad-
iustment mode
I -
Using Oscilloscope
I
1. Primary signal of ignition coil
(1) Run the engine at an idle speed.
(2) Connect the probe to oscilloscope pick-up point 1
2. Control signal of ignition power transistor
Connect the probe to oscilloscope pick-up point 2 as
shown in the circuit diagram, and check the control signal
of the ignition power transistor.
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Engine state
Terminal condition
ment terminal is
grounded
Ignition timing adjust- OFF
ment terminal is discon-
nected from ground
Check condition
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Engine: idling
l
Timing light: set
l
I
as shown in the circuit diagram, and check the primary
signal of the ignition coil.
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Standard value
Standard value
Normal condition
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