Mitsubishi 1992 3000GT, Service Manual

Page: 263 / 1308

MULTIPORT
On-Vehicle Inspection of MFI
FUEL INJECTION Components
INSPECTION
Using Scan Tool
Function
Item
No.
Data reading
44
I
I
I
Data display Check condition Engine state Standard value
Ignition
advance
l
Engine: Warming up 700 rpm (Idle)
l
Timing light: Set (set
timing light to check
actual ignition timing)
Turbo>
<Turbo>
<Ignition Timing Mode>
Item
Function Data display
present or not
present between ignition
timing adjustment termi-
nal and ground
Check
condition
l Engine:
Idling
Ignition Timing>
Function
Item No.
Terminal condition Standard value
timing adjust- ON
ment terminal is
grounded
Ignition timing adjust- OFF
ment terminal is discon-
nected from ground
Drive
I
Check condition
I
Normal condition
I
Actuator test 17 Set to ignition timing ad- l
iustment mode
Engine: idling
l
Timing light: set
I
I I I
1
1
Oscillo 1
I
.
Normal waveform
Oscillo 2
Normal waveform
Using Oscilloscope
1. Primary signal of ignition coil
(1) Run the engine at an idle speed.
(2) Connect the probe to oscilloscope pick-up point 1
as shown in the circuit diagram, and check the primary
signal of the ignition coil.
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.