Mitsubishi Galant. Manual — part 196
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-9
INSPECTION USING SCAN TOOL MB991502,
DATA LIST AND ACTUATOR TESTING
Required Special Tool:
MB991502: Scan Tool (MUT-II)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check and
repair the chassis harnesses and components. Refer to
Data List Reference Table (
). Refer to Actuator
Test Reference Table (
) .
4. Re-check using scan tool MB991502 and check to be sure
that the abnormal input and output have returned to normal
because of the repairs.
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 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
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 68 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 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 MUT-II (MB991502) 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 61 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: As for Diagnostic trouble code P1603, "freeze frame" data is not memorized.
AC003081 AB
16 PIN
MB991502
DATA
UNIT
Engine coolant temperature
°
C or
°
F
Engine speed
r/min
Vehicle speed
km/h or mph
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-10
OBD- II DRIVE CYCLE
All kinds of diagnostic trouble codes (DTCs) can be monitored by carrying out a test 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).
CAUTION
Two technicians should always be in the vehicle when carrying out a test drive.
NOTE: Check that the diagnosis trouble code (DTC) is not output before traveling in the drive cycle pattern.
Erase the DTC if it has been output.
DRIVE CYCLE PATTERN LIST
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
-
DATA
UNIT
PROCEDUR
E
MONITOR ITEM
DIAGNOSTIC TROUBLE
CODE (DTC)
Evaporative emission control system leak monitor
P0442, P0450,P0451, P0455
Fuel trim monitor
P0171,P0172,P0174,P0175
Catalytic converter monitor
P0421,P0431
Heated oxygen sensor monitor
P0130,P0133,
P0136,P0139,P0150,P0153,
P0156,P0159
Exhaust gas recirculation (EGR) system monitor
P0401
Other monitor
Main components
P0134, P0154,
P0300,P0301, P0302,
P0303, P0304, P0305,
P0306, P0506,P0507, P1400
Sensors and switches
P0101,P0102,
P0103,P0107,P0108, P0111,
P0115,
P0116,P0117,P0121,P0122,
P0123, P0335, P0340,
P0551
Wire breakage and short
circuit
P0130, P0135, P0136,
P0141, P0150, P0155,
P0156, P0161, P0201,
P0202, P0203, P0204,
P0205, P0206, P0403,
P0443, P0446, P1500
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-11
PROCEDURE 1
EVAPORATIVE EMISSION CONTROL SYSTEM LEAK MONITOR
DTC
P0442, P0450,P0451, P0455
Drive cycle
pattern
One drive [from start to ignition switch to the "LOCK" (OFF) position] will be completed while traveling with the
following drive pattern. It will take 8 minutes. You must complete this drive twice.
NOTE: . Vehicle speed and throttle opening angle should be within the shaded range. Test drive must be
completed within 16 minutes of "Key on."
Inspection
conditions
•
Engine coolant temperature: 30
°
C (75
°
F) or less (The engine is stopped before the test drive is started)
•
Atmospheric temperature: 5
−
45
°
C (41
−
113
°
F)
•
Condition of A/T: Selector lever D range
•
Test may not run if fuel tank is over 2/3 full.
Test procedure
1. Engine: start
2. Accelerate until the vehicle speed is 89
−
97 km/h (55
−
60 mph).
3. Travel for 200 seconds or more while keeping the vehicle speed at 89
−
97 km/h (55 - 60 mph).
4. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89
−
97 km/h (55
−
60 mph) and travel for 150 seconds or more. (During monitor)
5. Return the vehicle to the shop, then turn the ignition switch to the "LOCK" (OFF) position.
6. Confirm that the diagnostic trouble code (DTC) is not output.
7. If DTC P0442 is output, refer to DTC P0442
−
Evaporative Emission Control System Leak Detected
.
If DTC P0450 is output, refer to DTC P0450
−
Evaporative Emission Control System Pressure Sensor
Malfunction
If DTC P0451 is output, refer to DTC P0451
−
Evaporative Emission Control System Pressure Sensor Range/
performance
.
If DTC P0455 is output, refer to DTC P0455
−
Evaporative Emission Control System Leak Detected (Gross
Leak)
.
AKX01345
AKX01345
(3)
(2)
(1)
(4)
(5)
200 SECONDS
OR MORE
PREPARATION
PERIOD
ENGINE START
IGNITION
SWITCH:
"LOCK" (OFF)
DURING
MONITOR
150 SECONDS
OR MORE
89 - 97 km/h (55 - 60 mph)
97
(60)
64
(40)
32
(20)
0
100
50
0
VEHICLE SPEED
km/h (mph)
<REFERENCE>
THROTTLE
OPENING
ANGLE (%)
AKX01345 AB
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-12
PROCEDURE 2
FUEL TRIM MONITOR
DTC
P0171, P0172,P0174, P0175
Drive cycle
pattern
This monitor [from start to ignition switch to the "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 35 minutes. You must
complete this drive twice.
NOTE: . Vehicle speed and throttle opening angle should be within the shaded range.
Inspection
conditions
•
Engine coolant temperature: 80
−
97
°
C (176 - 207
°
F)
•
Atmospheric temperature: -10
−
60
°
C (14
−
140
°
F)
•
Condition of A/T: Selector lever D range
Test
procedure
1. Engine: start
2. Accelerate until the vehicle speed is 89
−
97 km/h (55
−
60 mph).
3. Travel for 30 minutes or more while keeping the vehicle speed at 89
−
97 km/h (55
−
60
mph). Carry out one gradual acceleration /deceleration, returning to a speed of 50
−
60
mph within 120 seconds. (During monitor)
4. Return the vehicle to the shop, then turn the ignition switch to the "LOCK" (OFF) position.
5. Confirm that the diagnostic trouble code (DTC) is not output.
6. If DTC P0171 is output, refer to DTC P0171
−
System too lean (Bank 1)
If DTC P0172 is output, refer to DTC P0172
−
System too rich (Bank 1)
If DTC P0174 is output, refer to DTC P0174
−
System too lean (Bank 2)
If DTC P0175 is output, refer to DTC P0175
−
System too rich (Bank 2)
AKX01346
AKX01346
(3)
(2)
(1)
(4)
30 MINUTES OR MORE
89 - 97 km/h (55 - 60 mph)
WITH 120 SECONDS
ENGINE START
IGNITION SW-
ITCH: "LOCK"
(OFF)
DURING MONITOR
97
(60)
64
(40)
32
(20)
0
100
50
0
VEHICLE SPEED
km/h (mph)
<REFERENCE>
THROTTLE
OPENING
ANGLE (%)
AKX01346 AB
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