Mitsubishi Galant (2004+). Manual - part 1213

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-545

CIRCUIT OPERATION

• A 5-volt power supply is applied on the throttle

position sensor (sub) power terminal (terminal
No. 5) from the PCM (terminal No. 94).
The ground terminal (terminal No. 3) is grounded
with PCM (terminal No. 95).

TECHNICAL DESCRIPTION

• The throttle position sensor (sub) outputs voltage

which corresponds to the throttle valve opening
angle.

• The PCM checks whether the voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor (sub) output voltage is out of

specified range.

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-546

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Throttle position sensor (sub) output voltage

should be 4.8 volts or more for 0.5 second.

OBD-II DRIVE CYCLE PATTERN
None.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• Throttle position sensor failed.

• Open throttle position sensor (sub) circuit, har-

ness damage, or connector damage.

• PCM failed.

START

YES

CONTINUOUS

FAILURE FOR 0.5sec

MALFUNCTION

END

GOOD

OUTPUT VOLTAGE

< =2.25V

OUTPUT VOLTAGE > =4.8V

AK302390

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-547

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991658: Test Harness

STEP 1. 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

P.00-6

NO : Go to Step 2.

STEP 2. Check harness connector B-06 at throttle position
sensor for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 8.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

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-548

STEP 3. Check the continuity at throttle position sensor
harness side connector B-06.

(1) Disconnect the connector B-06 and measure at the harness

side.

(2) Measure the continuity between terminal No. 3 and ground

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 7.
NO : Go to Step 4.

STEP 4. Check harness connector B-22 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.

2 1

6 5 4 3

AK303044

HARNESS
CONNECTOR:
COMPONENT SIDE

B-06 (B)

CONNECTOR: B-06

6 5 4 3 2

AK303046

B-06 HARNESS
CONNECTOR:
COMPONENT SIDE

AK303016

104

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

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

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