Mitsubishi Galant 9G. Manual — part 1146
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-884
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) Start the engine and run at idle.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0622 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0630: Vehicle Identification Number (VIN) Malfunction
.
TECHNICAL DESCRIPTION
• The Vehicle Identification Number (VIN) is stored
in the PCM by the vehicle manufacturer.
.
DESCRIPTIONS OF MONITOR METHODS
The PCM checks whether the VIN is being entered
or not.
.
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)
• Not applicable
.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-885
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• Ignition switch is in "ON" position.
• EEP ROM is normal.
Judgement Criteria
• VIN (current) has not been written.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
END
MALFUNCTION
YES
YES
NO
NO
VIN STORED
DTC & MIL
PREVIOUSLY SET
MONITORING
CONDITIONS
CLEAR DTC & MIL
START
AK401536
YES
GOOD
NO
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-886
STEP 1. Using scan tool MB991958, check VIN Information.
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) Set scan tool MB991958 to the coding mode for VIN
Information.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Has VIN (current) been written?
YES : Go to Step 2.
NO : Write VIN. Then go to Step 3.
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC)
(1) Turn the ignition switch to the "ON" position.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0630 set?
YES : Replace the PCM.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-887
STEP 3. Using scan tool MB991958, read the diagnostic
trouble code (DTC)
(1) Turn the ignition switch to the "ON" position.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0630 set?
YES : Replace the PCM.
NO : The inspection is complete.
DTC P0638: Throttle Actuator Control Motor Circuit Range/Performance Problem
CAUTION
If DTC P0638 has been set, TCL related DTC
U1120 is also set. After P0638 has been diag-
nosed, don't forget to erase DTC U1120.
.
THROTTLE ACTUATOR CONTROL
MOTOR CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT
• Refer to DTC P2101 − Throttle Actuator Control
.
CIRCUIT OPERATION
• Refer to DTC P2101 − Throttle Actuator Control
.
TECHNICAL DESCRIPTION
• PCM checks the electronic controlled throttle sys-
tem for abnormal conditions.
.
DESCRIPTIONS OF MONITOR METHODS
Difference between throttle position sensor (main)
output and target opening is greater than the
specified value.
.
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)
• Not applicable
.
DTC SET CONDITIONS
Check Conditions
• Battery positive voltage is higher than 8.3 volts.
• Throttle position sensor (main) output voltage is
between 0.35 and 4.8 volts.
• Drop of throttle position sensor (main) output volt-
age per 100 milliseconds is more than 0.04 volt.
Judgement Criteria
• Throttle position sensor (main) output voltage has
continued to be higher than the target throttle
position sensor (main) voltage by 0.5 volt or more
for 0.5 second.
Check Conditions
• Battery positive voltage is higher than 8.3 volts.
• Throttle position sensor (main) output voltage is
between 0.35 and 4.8 volts.
Judgement Criteria
• Difference between throttle position sensor
(main) output voltage and target throttle position
sensor (main) voltage is 1 volt or higher for 1 sec-
onds.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Throttle valve return spring failed.
• Throttle valve operation failed.
• Throttle actuator control motor failed.
• Harness damage in throttle actuator control
motor circuit, or connector damage.
• PCM failed.
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