Fuel System (Sohc 8 Valve) - Failsafe/Back-Up Functions List; Fuel System (Sohc 8 Valve) - Read Out Of Diagnostic Trouble Code - Mitsubishi 1989-1993 GALANT Service Manual

FUEL SYSTEM <SOHC-8 VALVE>
FAILSAFE/BACK-UP FUNCTIONS LIST
If trouble with any major sensor is detected by the on-board diagnostic, the vehicle will be kept in the safe
driving conditions according to the preset control logic.
Control content for trouble
Trouble item
Volume air flow Fuel injection timing and ignition timing are determined according to the throttle position
sensor (TPS) and engine revolution speed signal (crankshaft position sensor signal).
sensor
Intake air temperature The control is executed with the suction air temperature regarded as 25°C (77°F).
sensor
The fuel injection rate is not increased for acceleration according to the throttle position
Throttle position
sensor signal.
sensor (TPS)
After the idle speed control motor plunger is driven and contracted, the idle revolution speed
Idle speed control
motor position sensor is not controlled.
The control is executed with the engine coolant temperature regarded as 8OO.C (176°F).
Engine coolant
(Even if the sensor signal becomes normal again, the control is continued until the ignltlon
temperature sensor
switch is turned off.)
Simultaneous injection of fuel is executed for all cylinders. (In this case, the No.1 cylinder top
Camshaft position
dead center is not detected at all after the ignition key is turned on.)
sensor
The control is executed with the pressure regarded as 760 mmHg (30 in.Hg).
Barometric pressure
sensor
Closed loop control of the air/fuel mixture ratio is not executed.
Oxygen sensor
READ OUT OF DIAGNOSTIC TROUBLE CODE
Precautions for operation
(1) When battery voltage is low, no detection of failure is
possible. Be sure to check the battery for voltage and
other conditions before starting the test.
(2) On-board diagnostic item is erased if the battery or
the engine control module connector is discon-
nected. Do not disconnect the battery before the di-
agnostic result is completely read.
Using Scan Tool
(1) Switch OFF the ignition switch.
(2) Connect the power-source terminal
cigarette lighter socket.
the scan tool to the data link connector.
(3) Connect
(4) Turn ignition switch to ON.
(5) Using the scan tool, read out and make a note of the on-
board diagnostic output.
(6) Refer to the diagnostic chart, and repair the indicated loca-
tion of malfunction.
(7) Erase the diagnostic trouble code. (Refer to P.13-17.)
of the scan tool to the
I