Camshaft Position Sensor (Dohc) - Mitsubishi 1989-1993 GALANT Service Manual

FUEL SYSTEM <DOHC> -
CAMSHAFT POSITION SENSOR <Up to 1990 models>
One rotation of crankshaft position sensor
OPERATION
The camshaft position sensor functions to de-
l
tect the top dead center position of the No.1 cy-
linder and to convert those data to pulse signals
that are input to the engine control module. The
engine control module, based upon those sig-
nals, calculates the sequence of fuel injection.
TROUBLESHOOTING HINTS
If there is a malfunction of the camshaft position
sensor, the sequential injection will not be correct,
Normal waveform
On-Vehicle Inspection of MFI Components
Component side Crankshaft
connector
Crankshaft
position
sensor
connector
connector
Time
l
resulting in such problems as engine stalling, un-
stable idling, and poor acceleration.
INSPECTION
Using Oscilloscope
(1) Run the engine at an idle speed.
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform.
injection relay
position sensor
Camshatt posItIon sensor
Engine control module
The power for the camshaft position sensor is
supplied from the multiport fuel injection relay
and is grounded to the vehicle body. The cam-
shaft position sensor, by intermitting the flow (to
ground) of the
gine control module produces pulse signals.
2
applied from the en-