Mitsubishi Galant (2004+). Manual - part 813

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-69

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the manifold abso-

lute pressure sensor power terminal (terminal No.
3) from the PCM (terminal No. 68). The ground
terminal (terminal No. 2) is grounded with PCM
(terminal No. 69).

• A voltage that is proportional to the intake mani-

fold pressure is sent to the PCM (terminal No.
102) from the manifold absolute pressure sensor
output terminal (terminal No. 1).

TECHNICAL DESCRIPTION

• The manifold absolute pressure sensor outputs a

voltage which corresponds to the intake manifold
pressure.

• The PCM checks whether this voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS
Compare load value with manifold absolute pressure

sensor output voltage.

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)

• Engine coolant temperature sensor

• Throttle position sensor

AK303013

CONNECTORS: B-21, B-22

PCM

AIR CLEANER

B-22 (B)

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-70

DTC SET CONDITIONS <Range/Performance problem

− high input>

Logic Flow Chart

Check Conditions

• 8 minutes or more have passed since the engine

starting sequence was completed, when the
engine coolant temperature at engine start is 0

°C

(32

°F) or lower.

• Engine speed is 1,500 r/min or lower.

• Throttle position sensor output voltage is 0.8 volt

or lower.

Judgement Criteria

• Manifold Absolute pressure is 89 kPa (26.3

in.Hg) or higher for 2 seconds.

START

YES

MONITORING

CONDITIONS

PRESSURE

> 89kPa (26.3in.Hg)

CONTINUOUS

FAILURE FOR 2secs

MALFUNCTION

END

GOOD

THROTTLE POSITION

< =0.8V

AK302009

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-71

DTC SET CONDITIONS <Range/Performance problem

− low input>

Logic Flow Chart

Check Conditions

• 8 minutes or more have passed since the engine

starting sequence was completed, when the
engine coolant temperature at engine start is 0

°C

(32

°F) or lower.

• Engine speed is 1,500 r/min or higher.

• Throttle position sensor output voltage is 3.5 volts

or higher.

Judgement Criteria

• Manifold absolute pressure is 45 kPa (8.3 in.Hg)

or lower for 2 seconds.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-5

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

• Manifold absolute pressure sensor failed.

• Harness damage.

• Connector damage.

• PCM failed.

START

YES

MONITORING

CONDITIONS

PRESSURE

< 45kPa (8.3in.Hg)

CONTINUOUS

FAILURE FOR 2secs

MALFUNCTION

END

GOOD

THROTTLE POSITION

>= 3.5V

AK302010

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-72

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991923: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check data list item 95:
Manifold Absolute Pressure Sensor.

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

95, Manifold Absolute Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).

• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).

• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0

in.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9

in.Hg).

(4) Start the engine.

• When the engine is idling, 19 − 33 kPa (5.6 − 9.7 in.Hg).

• When the engine is suddenly revved, manifold absolute

pressure varies.

(5) 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.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

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