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 

P.00-14

.

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 

Motor Circuit 

P.13B-932

.

.

CIRCUIT OPERATION

• Refer to DTC P2101 − Throttle Actuator Control 

Motor Circuit 

P.13B-932

.

.

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.