Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 78
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-11
5. Erase the diagnostic trouble code(s).
6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect scan tool MB991502 from the data link
connector.
8. Start the engine again and do a test drive to confirm that the
problem is eliminated.
ON-BOARD DIAGNOSTICS
The engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T> monitors the input/
output signals (some signals all the time and others under specified conditions) of the ECM <M/T> or PCM
<A/T>. When a malfunction continues for a specified time or longer after the irregular signal is initially
monitored, the ECM <M/T> or PCM <A/T> judges that a malfunction has occurred. After the ECM <M/T> or
PCM <A/T> first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted
and the same malfunction is re-detected. However, for items marked with a "*," a diagnostic trouble code is
recorded on the first detection of the malfunction. There are 51 diagnostic items. The diagnostic results can
be read out with a scan tool. Since memorization of the diagnostic trouble codes is backed up directly by the
battery, the diagnostic results are memorized even if the ignition key is turned off. The diagnostic trouble
codes will, however, be erased when the battery terminal or the ECM <M/T> or PCM <A/T> connector is
disconnected. In addition, the diagnostic trouble code can also be erased by turning the ignition switch to ON
and sending the diagnostic trouble code erase signal from scan tool MUT-II (MB991502) to the ECM <M/T>
or PCM <A/T>.
NOTE: If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble code
is memorized. In this case, send the diagnostic trouble code erase signal to the ECM <M/T> or PCM <A/T> in
order to erase the diagnostic memory. The 51 diagnostic items are all indicated sequentially from the smallest
code number. The ECM <M/T> or PCM <A/T> records the engine operating condition when the diagnostic
trouble code is set. This data is called "Freeze-frame" date. This data can be read by using the scan tool, and
can then be used in simulation tests for troubleshooting. Data items are as follows:
OBD- II DRIVE CYCLE
All kinds of diagnostic trouble codes (DTCs) can be monitored by carrying out a short drive according to the
following six drive cycle pattern. In other words, doing such a drive regenerates any kind of trouble which
involves illuminating the Service Engine Soon/Malfunction Indicator Lamp and verifies the repair procedure
has eliminated the trouble (the Service Engine Soon/Malfunction Indicator Lamp is no longer illuminated).
DATA
UNIT
Engine coolant temperature
°
C or
°
F
Engine speed
r/min
Vehicle speed
km/h or mph
Long-term fuel compensation (long-term fuel trim)
%
Short-term fuel compensation (short-term fuel trim)
%
Fuel control condition
•
Open loop
•
Closed loop
•
Open loop-drive condition
•
Open loop-DTC set
•
Closed loop-O
2
(rear) failed
Calculation load value
%
Diagnostic trouble code during data recording
-