Mitsubishi 3000GT Service Manual page 369

INSPECTION
Using Scan Tool
Data reading 44
Function Item No.
Data list
<Standard Ignition Timing>
Function Item No.
Actuator test 17
Oscillo 1
o v
Normal waveform
Oscillo 2
ov
Normal waveform
MULTIPORT
FUEL INJECTION Components
Data display Check condition
Ignition Engine: Warming up 700 rpm
l
Timing light: Set (set (Idle)
advance l
timing light to check
actual ignition tim- 2,000
Data display
l
Drive
Set to ignition timing
adjustment mode
Using Oscilloscope
1. Primaty 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.
Engine state
rpm
models>
2,500 rpm 32-52" BTDC <Non Turbo>
models>
Check
Terminal condition
condition
Engine: Ignition timing adjust- ON
Idling terminal
ment
grounded
Ignition timing adjust- OFF
ment terminal is discon-
nected from ground
Check condition
Engine: idling
l
Timing light: set
l
as shown in the circuit diagram, and check the primary
signal of the ignition coil.
Standard value
7-23" BTDC
23-43" BTDC <Turbo>
Standard value
is
Normal condition
5" BTDC