Mitsubishi 1992 3000GT, Service Manual

Page: 130 / 1308

MULTIPORT FUEL INJECTION Troubleshootina
Fault ID Title
Effect Probable causes
23 Camshaft Position Sensor
Background
Limp-in
l
Camshaft position sensor
l
When the engine is running, the camshaft position sensor outputs
(a) Injects fuel into all
failed.
a pulse signal.
cylinders
l
Open or shorted camshaft
The engine control module checks whether the pulse signal
neously. (After the
position sensor circuit, or loose
is input.
ignition switch is
connector.
The engine control module checks the pulse signal patterns turned to ON, the
l
Engine control module failed.
of the camshaft position sensor. No.1 cylinder top
Range of Check, Set Conditions
dead center is not
Range of check
detected at all.)
l
Ignition switch ON
(b) Cuts off the fuel
Engine speed is approx. 50 or more.
supply 4 seconds
Set conditions
after a problem is
detected. (After the
Sensor output voltage does not change for 4 seconds (no pulse
signal input).
Range of check
l
Ignition switch ON
l
Engine is not cranking.
Set conditions
ignition switch is
turned to ON, the
No.1 cylinder top
dead center is not
detected at all.)
Regular signal patterns for cylinder discrimination from the
crankshaft position sensor signal and the camshaft position
sensor signal are not input 20 times in a 10 seconds period.
speed sensor outputs a pulse signal while the vehicle
ne control module checks whether the pulse signal
module failed.
Range of Check
l
Ignition switch ON
l
Excluding 60 seconds after the ignition switch is turned to ON
or immediately after the engine starts.
l
Closed throttle position switch OFF
l
Engine speed is 3,000 or more.
l
Driving under high engine load conditions.
Set Conditions
ut voltage does not change for 4 seconds (no pulse
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