Failsafe/Back-Up Functions List - Fuel System (Dohc); Clear Memory Of Diagnostic Trouble Code - Mitsubishi 1989-1993 GALANT Service Manual

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-accdrding to the preset control logic.
Trouble item Control content for trouble
Volume air flow
(1) Fuel injection timing and ignition timing are determined according to the throttle positior
sensor
(2) The idle air control motor is fixed at the specified position, and the idle revolution speec
Intake air
The control is executed with the suction air temperature regarded as 25'C (77°F).
temperature sensor
Throttle positron
The fuel injection rate is not increased for acceleration according to the throttle position
sensor (TPS) sensor signal.
Engine coolant
The control
temperature sensor
(Even if the sensor signal becomes normal again, the control is continued until the ignition
switch is turned off.)
Camshaft position (1) Simultaneous injection of fuel is executed for all cylinders.
sensor
(2) Fuel is cut 4 seconds after trouble is detected.
Barometric pressure The control is executed with the pressure regarded as 760 mmHg (30 in.Hg.).
sensor
Knocksensor The ignition timing is retarded further from the normal state, and ignition is executed even
when knocking does not occur.
Ignition coil, ignition Fuel is cut in the cylinder where the ignition signal is abnormal.
power transistor unit
Heated oxygen sensor Closed loop control of the air/fuel mixture ratio is not executed.
FUEL SYSTEM <DOHC> - Troubleshooting
sensor (TPS) and engine revolution speed signal (crankshaft position sensor signal).
control is not executed.
executed with the engine coolant temperature regarded as 80°C (176°F).
IS
(In this case, the No. 1 cylinder top
key is turned on.)
(In this case, the No. 1 cylinder top dead center
key is turned on.)
READ OUT OF DIAGNOSTIC TROUBLE CODE
Refer to P.13-16.
CLEAR MEMORY OF DIAGNOSTIC TROUBLE
CODE
Refer to P.13-17.
TSB Revision
dead
center is not detected at all after the ignition
not detected at all after the ignition
IS