Mitsubishi Galant 9G. Manual — part 682

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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CIRCUIT OPERATION

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

position sensor (main) 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 (main) outputs volt-

age which corresponds to the throttle valve open-
ing angle.

• The PCM checks whether the voltage is within a

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

Throttle position sensor (main) 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

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• Throttle position sensor (main) 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 (main) circuit, har-

ness damage or connector damage.

• PCM failed.

START

YES

YES

YES

NO

NO

NO

CONTINUOUS

FAILURE FOR 0.5sec

MALFUNCTION

END

GOOD

OUTPUT VOLTAGE

< =0.35V

OUTPUT VOLTAGE > =4.8V

AK302016

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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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 79:
Throttle Position Sensor (main).

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

79, Throttle Position Sensor (main).

• Output voltage should be between 0.3 and 0.7 volt 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

− How to

Cope with Intermittent Malfunctions

P.00-14

.

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.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303818

1

6 5 4 3 2

AB

CONNECTOR: B-06

B-06 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-173

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.

AK303818

1

6 5 4 3 2

AB

CONNECTOR: B-06

B-06 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

1

6 5 4 3 2

AK203051

B-06 HARNESS
CONNECTOR:
COMPONENT SIDE

AC

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