Mitsubishi Galant 9G. Manual — part 644
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-18
DIAGNOSTIC BY DIAGNOSTIC TEST MODE II
(INCREASED SENSITIVITY)
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
NOTE: When mode II is selected with MB991958, the Malfunc-
tion Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) will light when the powertrain control module
(PCM) first detects the trouble (Note that this is only for emis-
sion-related trouble). At the same time, the relevant diagnostic
trouble codes will be registered. In respect to the comprehen-
sive component electrical faults (opens/shorts), the time for the
diagnostic trouble code to be registered after the fault occur-
rence is four seconds
→
one second. Therefore, the confirma-
tion of the trouble symptom and the confirmation after
completing repairs can be reduced. To return to the normal
mode I after mode II has been selected once, the ignition
switch must be turned "OFF" once or mode I must be rese-
lected with MB991958. The diagnostic trouble code, system
readiness test status and freeze frame data, etc., will be erased
when mode I is returned to, so record these before returning to
mode I.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Change the diagnostic test mode of the powertrain control
module to DIAGNOSTIC TEST MODE II (INCREASED
SENSITIVITY).
4. Road test the vehicle.
5. Read the diagnostic trouble code and repair the
malfunctioning part.
6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect scan tool MB991958 from the data link
connector.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-19
ON-BOARD DIAGNOSTICS
The powertrain control module (PCM) monitors the input/output signals (some signals all the time and others
under specified conditions) of the PCM. When a malfunction continues for a specified time or longer after the
irregular signal is initially monitored, the PCM judges that a malfunction has occurred. After the PCM first
detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted and the same mal-
function is re-detected. However, for items marked with a "*", a diagnostic trouble code is recorded on the first
detection of the malfunction. There are 126 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 diag-
nostic 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 PCM 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 MB991958 to the PCM.
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 PCM in order to erase the
diagnostic memory. The 126 diagnostic items are all indicated sequentially from the smallest code number.
The PCM records the engine operating condition when the diagnostic trouble code is set. This data is called
"Freeze-frame" data. 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:
NOTE: If the PCM detects multiple malfunctions, the PCM stores the "Freeze-frame" data for only the first
item that was detected. However, if the PCM detects a misfire or a fuel system malfunction, the PCM stores
the data by giving priority to the misfire or fuel system malfunction, regardless of the order in which the mal-
function was detected.
NOTE: As for Diagnostic trouble code P1603, "Freeze frame" data is not memorized.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-20
MUT-III SCAN TOOL
DISPLAY
ITEM NO.
DATA ITEM
UNIT or STATE
ECT SENSOR
21
Engine coolant temperature sensor
°C or °F
ENGINE LOAD
87
Calculated load value
%
ENGINE SPEED
22
Crankshaft position sensor
r/min
IAT SENSOR
13
Intake air temperature sensor
°C or °F
IG.TIMING ADV
44
Ignition coils and ignition power transistor deg
LONG TRIM B1
81
Cylinder 1, 4 long-term fuel trim
%
LONG TRIM B2
83
Cylinder 2, 3 long-term fuel trim
%
MAP/MDP SNSR.
32
Manifold absolute pressure sensor
kPa or in.Hg
SHORT TRIM B1
82
Cylinder 1, 4 short-term fuel trim
%
SHORT TRIM B2
84
Cylinder 2, 3 short-term fuel trim
%
SYS.STATUS B1
88
Cylinder 1, 4 fuel control system status
• Open loop
• Closed loop
• Open loop-drive
condition
• Open loop-DTC set
• Closed loop-O
2
(rear)
failed
SYS. STATUS B2
89
Cylinder 2, 3 fuel control system status
• Open loop
• Closed loop
• Open loop-drive
condition
• Open loop-DTC set
• Closed loop-O
2
(rear)
failed
TP SENSOR
8A
Throttle position sensor
%
VAF/MAF SNSR.
12
Mass airflow sensor
gm/s
VSS
24
Vehicle speed signal
km/h or mph
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-21
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 Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) and
verifies the repair procedure has eliminated [the trouble the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) is no longer illuminated].
CAUTION
Two technicians should always be in the vehicle when carrying out a test.
NOTE: Check that the diagnosis trouble code (DTC) is not output before driving the OBD-II drive cycle. Erase
the DTC if it has been output.
DRIVE CYCLE PATTERN LIST
.
PROCEDURE
MONITOR ITEM
DIAGNOSTIC TROUBLE
CODE (DTC)
Evaporative emission system leak monitor
P0441, P0442, P0451,
P0452, P0453, P0455,
P0456
Fuel trim monitor
P0171, P0172, P0174,
P0175
Catalytic converter monitor
P0421, P0431
Heated oxygen sensor monitor
P0133, P0139, P0153,
P0159
Exhaust gas recirculation (EGR) system monitor
P0401
Other monitor
Main components
P0106, P0107, P0108,
P0134, P0154, P0300,
P0301, P0302, P0303,
P0304, P0506, P0507
Sensors and switches
P0069, P0101, P0102,
P0103, P0111, P0112,
P0113, P0116, P0117,
P0118, P0125, P0181,
P0182, P0183, P0335,
P0340, P0461, P2066,
Wire breakage and short
circuit
P0130, P0131, P0132,
P0135, P0136, P0137,
P0138, P0141, P0150,
P0151, P0152, P0155,
P0156, P0157, P0158,
P0161, P0201, P0202,
P0203, P0204, P0403,
P0443, P0446, P0462,
P0463, P2228, P2229
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