13-74
FUEL SYSTEM
VALVE>
inspection of
Components
Hint 4:
If idling is possible even though the crankshaft
tion sensor indicated rpm is a deviation from the
standard value, the cause is usually a malfunction of
something other than the crankshaft position
sor.
Examples:
(1) Malfunction of the coolant-temperature sensor.
(2) Malfunction of the idling-speed control motor.
(3) Improper adjustment of the standard idling
speed.
INSPECTION
Using Scan tool
Function
Item No.
Data reading 22
Data display
Inspection conditions
Description
Normal condition
Cranking rpm
. Engine: Cranking
Compare cranking
Both agree.
. Tachometer connection
rpm and scan tool
(Check intermittent flow of
indicated
ignition coil primary current
by tachometer.)
Function
Data reading
Item No.
22
Data display
Inspection conditions Engine coolant temperature Standard value
At
I
I
At
rpm
Normal waveform
HARNESS INSPECTION
I
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.
Harness side
connector
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
TSB Revision
Содержание 1989 Galant
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