Mitsubishi 1989-1993 GALANT Service Manual page 216

13-74
FUEL SYSTEM <SOHC-8 VALVE> -
Hint 4:
If idling is possible even though the crankshaft posi-
tion sensor indicated rpm is a deviation from the
standard value, the cause is usually a malfunction of
something other than the crankshaft position sen-
sor.
INSPECTION
Using Scan tool
Function Item No.
Data reading 22
Function Item No.
22
Data reading
Normal waveform
HARNESS INSPECTION
Harness side
connector
Data display Inspection conditions
Cranking rpm . Engine: Cranking
. Tachometer connection
(Check intermittent flow of
ignition coil primary current
by tachometer.)
Data display
I
Using Oscilloscope
(2) Connect
shown in the circuit diagram, and
Measure the power
. C o n n e c t o r : D i s c o n n e c t e d -
. Ignition switch: ON
Examples:
(1) Malfunction of the coolant-temperature sensor.
(2) Malfunction of the idling-speed control motor.
(3) Improper adjustment of the standard idling
speed.
Description
Compare cranking
rpm and scan tool
indicated rpm.
I
the probe to the oscilloscope pick-up point as
Normal condition
Both agree.
check the waveform.