Mitsubishi 1992 3000GT, Service Manual

Page: 135 / 1308

MULTIPORT FUEL INJECTION Troubleshooting
Fault ID
Title
62 Induction Control Valve Position
Effect Probable causes
Turbo> Sensor
Background
Limp-in
l
control valve position
l
The induction control valve position sensor outputs a pulse signal The induction control
sensor failed.
according to a change of the valve opening.
valve is driven under
l
Open or shorted induction
l
The engine control module checks an actual valve position when
condition of the valve full
control valve position sensor
the intake-air control valve drive motor was driven. opening.
circuit, or loose connector.
l
Variable induction control
Range of Check
motor failed.
l
60 seconds or more have passed immediately after engine was
l
Open or shorted variable
started. induction control motor circuit,
l
Engine speed is approx. 50 or more. or loose connector.
l
Battery voltage is 10 V or more.
l
Engine control module failed.
Set Conditions
l
The intake-air control valve does not reach target position even
after the intake-air control valve drive motor is operated several
times.
l
When the range of check operations given above which
accompany starting of the engine are carried out four times
in succession, a problem is detected after each operation.
Fault ID
Title
69
and
Right Bank Heated Oxygen Sensor
a t e r
nia
Effect Probable causes
Background
Limp-in
l
Oxygen sensor deteriorated.
l
The oxygen sensor converts the oxygen density in the exhaust
The air/fuel ratio
l
Open or shorted oxygen
gas to a voltage and outputs it.
back control (closed
sensor circuit, or loose
l
The engine control module checks an output voltage of the loop control) is
connector.
oxygen sensor when the oxygen volume in the exhaust gas formed only by using a
l
Engine module failed.
is little (Air/fuel ratio is rich.).
signal of the oxygen
Range of Check
sensor (front) which is
installed on the front
l
Approx. minutes or more have passed after engine started. side the
l
Engine coolant temperature is approx. or more. converter.
l
Closed throttle position switch OFF
l
The throttle position sensor output voltage is 4.1 V or more.
Open loop control in operation.
l
20 seconds have passed after deceleration finished.
Set Conditions
l
The heated oxygen sensor (rear) output voltage is 0.1 V or
less.
l
The heated oxygen sensor (front) output voltage is 0.5 V or
more.
l
The above conditions continue for a continuous period of 5
seconds.
TSB Revision