Mitsubishi Montero Sport (2004+). Manual - part 153
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-25
FAIL-SAFE/BACKUP FUNCTION TABLE
M1131153000307
When the main sensor malfunctions are detected by the diagnostic test mode, the vehicle is controlled by
means of the following defaults.
MALFUNCTION ITEM
DEFAULT VALUES DURING MALFUNCTIONS
Volume airflow sensor
1. Uses the throttle position sensor signal and engine speed signal (crankshaft
position sensor signal) for basic injector drive time and basic ignition timing
from the pre-set mapping.
2. Fixes the IAC motor in the appointed position so idle air control is not
performed.
Intake air temperature
sensor
Controls as if the intake air temperature is 25
°C (77°F).
Throttle position sensor
No increase in fuel injection amount during acceleration due to the unreliable
throttle position sensor signal.
Engine coolant
temperature sensor
Controls as if the engine coolant temperature is 80
°C (176°F). (This control will
be continued until the ignition switch is turned to the "LOCK" (OFF) position
even though the sensor signal returns to normal.)
Camshaft position sensor Injects fuel simultaneously into all cylinders. (After the ignition switch is turned to
the "ON" position, the No.1 cylinder top dead center is not detected at all.)
Barometric pressure
sensor
Controls as if the barometric pressure is 101 kPa (30 in Hg).
Heated oxygen sensor
<front>
Air/fuel ratio closed loop control is not performed.
Heated oxygen sensor
<rear>
Performs the closed loop control of the air/fuel ratio by using only the signal of
the heated oxygen sensor (front) installed on the front side of the catalytic
converter.
Misfire detection
The PCM stops supplying fuel to the cylinder with the highest misfiring rate if a
misfiring that could damage the catalytic converter is detected.