Mitsubishi Galant (2004+). Manual — part 1214
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-549
STEP 5. Check for open circuit and harness damage
between throttle position sensor connector B-06 (terminal
No. 3) and PCM connector B-22 (terminal No. 95).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 8.
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-550
STEP 6. Using scan tool MB991958, check data list item 14:
Throttle Position Sensor (sub).
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
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only
terminals No. 3, No. 4, No. 5, and No. 6.
(6) Set scan tool MB991958 to the data reading mode for item
14, Throttle Position Sensor (sub).
• Output voltage should be between 2.2 and 2.8 volts
when the throttle valve is fully closed with your finger.
• Output voltage should be 4.0 volts or more when the
throttle valve is fully open with your finger.
(7) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Replace the PCM. Then go to Step 8.
STEP 7. Replace the throttle body assembly.
(1) Replace the throttle body assembly.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0223 set?
YES : Replace the PCM. Then go to Step 8.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-551
STEP 8. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P0223 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0300: Random/Multiple Cylinder Misfire Detected
CAUTION
If DTC P0300 has been set, TCL related DTC
U1120 is also set. After P0300 has been diag-
nosed, don't forget to erase DTC U1120.
.
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The PCM checks for such changes in engine
speed.
.
DESCRIPTIONS OF MONITOR METHODS
Monitor angular acceleration of crankshaft and
detect malfunction when negative variation of the
angular acceleration is large.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Camshaft position sensor
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-552
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine speed is between 440 and 6,200 r/min.
• Engine coolant temperature is higher than −10°C
(14
°F).
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• Volumetric efficiency is between 30 and 60 per-
cent.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shift-
ing, deceleration, sudden acceleration/decelera-
tion and A/C compressor switching.
• The throttle deviation is −0.06 V/10 ms to +0.06
V/10 ms.
START
MONITORING
CONDITIONS
CALCULATE CRANKSHAFT
ANGULAR ACCELERATION (An)
An < TH
MF
(Ne, v)
MISFIRE
CALCULATE PERCENT MISFIRE (R
MF
)
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
GOOD
WITHIN 1000rev
R
MF
> SPECIFIED VALUE
MALFUNCTION
(EXCEED STD ×1.5)
GOOD
MALFUNCTION
(CATALYTIC CONVERTER
IS DAMAGED.)
GOOD
R
MF
> TH
CD
(Ne, v)
CALCULATE PERCENT MISFIRE (R
MF
)
WITHIN 200rev
Ne: ENGINE SPEED
v: VOLUMETRIC EFFICIENCY
AK204053
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