Mitsubishi 1992 3000GT, Руководство по обслуживанию

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MULTIPORT FUEL INJECTION Troubleshooting
LIST OF FAIL-SAFE/BACK-UP FUNCTIONS
When the failure of a major sensor is detected by the on-board diagnostics, the preset control logic
provides controls to assure safe operation of the vehicle.
Trouble item
Controls to be provided in the event of trouble
Volume air flow (1) Based on throttle position sensor (TPS) signal and engine speed signal (crank angle sensor
sensor . signal), 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 Controls provided on the assumption that intake air temperature is
ature sensor
Throttle position
sensor (TPS) No additional fuel injection provided on the basis of throttle position sensor signal at acceleration
Engine coolant Controls provided on the assumption that engine coolant temperature is (176°F) (Even if
temperature the sensor signal returns to normal, this control mode is retained until the switch is set to
sor OFF.)
Camshaft (1) Fuel injected into the cylinders in the order l-2-3-4-5-6 with irregular timing
position sensor (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
sure sensor
Controls provided on the assumption that barometric pressure is (760 (sea level)
Knock sensor
Ignition coil and
ignition power
transistor unit
Ignition timing is changed from that for premium gasoline to that for regular gasoline.
Fuel cut for cylinders whose ignition signal is abnormal
Induction control
valve position
sensor
Turbo>
The induction control valve is driven to full open position.
Communication
line with
mission control
module No ignition timing retard control (overall engine-transmission control) achieved when
sion speeds are changed
Heated oxygen
sensor (front) No air-fuel ratio closed loop control achieved
Heated oxygen
sensor (rear)
Misfire detection
Only signals of oxygen sensor (front) installed upstream of catalyst are used, and the air-fuel ratio
feedback control (closed loop control) is not performed.
The ECM stops supplying fuel to the cylinder with the highest misfiring rate if a misfiring that could
damage the catalytic converter is detected.
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