Mitsubishi Galant (2004+). Manual - part 1283

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-825

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 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-869

CIRCUIT OPERATION

• Refer to DTC P2101 − Throttle Actuator Control

Motor Circuit

P.13B-869

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.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-826

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 4 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.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item
9A: Throttle Position Sensor (main) Mid Opening Learning
Value.

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) Set scan tool MB991958 to the data reading mode for item

9A, Throttle position sensor (main) mid opening learning
value.

• Check that it is between 0.6 and 1.2 volts.

(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the measured voltage 4 volts or less?

YES : Go to Step 2..
NO : Replace the throttle body assembly. Then go to Step

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-827

STEP 2. Check the throttle actuator control motor.

(1) Disconnect the connector B-06.

(2) Measure the resistance between throttle actuator control

motor side connector terminal No. 1 and No. 2.

Standard value: 0.3

− 80 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 0.3 and 80 ohms [at

°C (68°F)]?

YES : Go to Step 3.
NO : Replace the throttle body assembly. Then go to Step

STEP 3. Check harness connector B-06 at throttle actuator
control motor for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 8..

2 1

6 5 4 3

AK303044

HARNESS
CONNECTOR:
COMPONENT SIDE

B-06 (B)

CONNECTOR: B-06

1 2 3 4 5

AK202992

THROTTLE ACTUATOR
CONTROL MOTOR
CONNECTOR

2 1

6 5 4 3

AK303044

HARNESS
CONNECTOR:
COMPONENT SIDE

B-06 (B)

CONNECTOR: B-06

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-828

STEP 4. Check harness connector B-23 at PCM for
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 8.

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AIR CLEANER

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