Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 80
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-19
READINESS TEST STATUS
PURPOSE
The Readiness function also referred as I/M
Readiness or I/M Flags indicate if a full diagnostic
check has been "Completed" (is "Ready") for each
non-continuous monitor. Enhanced I/M State
Emission Programs will use the Readiness status
(Codes) to see if the vehicle is ready for OBD-II
testing. "Incomplete" (Not Ready) codes will be one
of the triggers for I/M failure.
OVERVIEW
The engine control module (ECM) <M/T> or
powertrain control module (PCM) <A/T> monitors the
following main diagnosis items and records whether
the evaluation was completed or is incomplete. The
Readiness codes were established for the I/M
programs, thereby confirming that the vehicle was
not tampered with by erasing the diagnostic trouble
code(s) (DTC's) before I/M testing. The Readiness
and DTC codes can be reset by disconnecting the
battery or by erasing the codes with a scan tool. For
this reason all Readiness codes must read
"Complete" before I/M testing.
When the monitors run and complete, the MUT-II will
record the Readiness Code as "Complete" (General
Scan Tools record as "Ready"). If the monitor did not
run completely, the system then reads as
"Incomplete" (General Scan Tools record as "Not
Ready"). When the vehicle is operating normally and
the OBD-II Drive Cycle is carried out, Readiness
Code will set as "Complete" on the first drive cycle. If
during the first drive cycle a fault is detected then, a
second drive is required before the Readiness Code
will "Complete." If the fault is still there, then a DTC
will set.
•
Catalyst: P0421
•
Evaporative system: P0442, P0455
•
Heated oxygen sensor: P0130,P0133,
P0136,P0139
•
Heated oxygen sensor heater: P0135, P0141
•
EGR system: P0401
After the Readiness is "Complete," the technician is
assured that any DTC's associated with that monitor
will be displayed if the system has a problem. That is
why some State's I/M programs require the
Readiness Code as "Complete" before they check
for DTC's.
NOTE: After a repair is mode for a DTC the
technician should drive the OBD-II drive cycle
checking that the MUT-II records all Readiness as
"Complete".
FAIL-SAFE/BACKUP FUNCTION TABLE
M1131009100065
When the main sensor malfunctions are detected by the diagnostic test mode, the vehicle is controlled by
means of the following defaults.
MALFUNCTION ITEM
CONTROL CONTENTS DURING MALFUNCTION
Volume air flow 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).
Knock sensor
Switches the ignition timing from ignition timing for high octane to ignition timing
for standard octane fuel.