Mitsubishi Stealth 1994 Import Service Manual page 458

MULTIPORT FUEL INJECTION
Diagnos-
Diagnostic item
tic
trouble
code No.
69
Right bank
heated oxygen
sensor (Rear)
<California>
LIST OF FAIL-SAFE/BACK-UP FUNCTIONS
the failure of a major sensor is detected by the on-board diagnostics, the preset control logic provides
When
controls to assure safe operation of the vehicle.
Trouble item
Volume air flow
sensor
basic driving time of injectors and basic ignition timing is read from the preset map.
(2) Idle air control motor fixed at predetermined position, and no idling speed control achieved
Intake air tem-
Controls provided on the assumption that intake air temperature is 25°C (77°F)
perature sensor
Throttle position No additional fuel injection provided on the basis of throttle position sensor signal at acceleration
sensor (TPS)
Engine coolant Controls provided on the assumption that engine coolant temperature is 80°C (176°F)
temperature (Even if the sensor signal returns to normal, this control mode is retained until the ignition switch
sensor
is set to OFF.)
Camshaft (1) Fuel injected into the cylinders In the order 1-2-3-4-5-6 with irregular timing
(Provided that no No. 1 cylinder top dead center position has been detected since the
ignition switch was placed in the ON position)
(2) Fuel cut 4 seconds after a failure was detected
(Provided that no No. 1 cylinder top dead center position has been detected since the
ignition switch was placed in the ON position)
Barometric Controls provided on the assumption that barometric pressure is 101 kPa (760 mmHg) (sea level)
pressure sensor
Knock Ignition timing is changed from that for premium gasoline to that for regular gasoline.
sensor <DOHC>
Ignition coil and Fuel cut for cylinders whose ignition signal is abnormal
ignition power
transistor unit
<DOHC>
Communication No ignition timing retard control (overall engine-transmission control) achieved when transmission
line with speeds are changed
transmission
control module
No air-fuel ratio closed loop control achieved
Heated oxygen
sensor (front)
<All models>
Heated oxygen Only signals of oxygen sensor (front) installed upstream of catalyst are used, and the air-fuel ratio
sensor (Rear) feedback control (closed loop control) is not performed.
<California>
Description
Engine warm-up has been (1) Failure of oxygen sensor
completed, but oxygen
sensor signal voltage does
not rise above 0.1 V.
Controls to be provided in the event of trouble
Major cause
(2) A break or short in oxygen
sensor circuit or poor contact
of connectors
(3) Failure of engine control module
Remarks
(Symptoms, etc.)
Decrease of exhaust
l
gas purification
performance*