Mitsubishi Galant. Manual — part 155

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-301

STEP 1. Using scan tool MB991502, check data list item 95:
Manifold Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

95, Manifold Differential Pressure Sensor.

•

While engine is idling, pressure should be between 62
and 76 kPa.

(4) 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.00-8

).

NO : Go to Step 2.

STEP 2. Check connector B-18 at manifold differential
pressure sensor for damage.
Q: Is the 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 12.

STEP 3. Check the sensor supply voltage at manifold
differential pressure sensor harness side connector B-18.
(1) Disconnect the connector B-18 and measure at the harness

side.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 3 and ground.

•

Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to "LOCK"(OFF) position.

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Go to Step 4.

AC003081 AB

16 PIN

MB991502

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AKX01427

B-18 HARNESS SIDE
CONNECTOR

1

2

3

AE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-302

STEP 4. Check connector C-40 at PCM for damage.
Q: Is the 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 12.

STEP 5. Check for open circuit and short circuit to ground
between manifold differential pressure sensor connector
B-18 terminal 3 and PCM connector C-40 terminal 46.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

STEP 6. Check the continuity at manifold differential
pressure sensor harness side connector B-18.
(1) Disconnect the connector B-18 and measure at the harness

side.

(2) Measure the continuity between terminal 2 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 9.
NO : Go to Step 7.

AK000280

CONNECTOR : C-40

PCM

AV

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AK000280

CONNECTOR : C-40

PCM

AV

AKX01426

B-18 HARNESS SIDE
CONNECTOR

1

2

3

AE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-303

STEP 7. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

STEP 8. Check for open circuit and harness damage
between manifold differential pressure sensor connector
B-18 terminal 2 and PCM connector C-40 terminal 57.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

STEP 9. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

AK000280

CONNECTOR : C-40

PCM

AV

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AK000280

CONNECTOR : C-40

PCM

AV

AK000280

CONNECTOR : C-41

PCM

AY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-304

STEP 10. Check for harness damage between manifold
differential pressure sensor connector B-18 terminal 3 and
PCM connector C-40 terminal 46.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 12.

STEP 11. Check for open circuit and short circuit to ground
and harness damage between manifold differential
pressure sensor connector B-18 terminal 1 and PCM
connector C-41 terminal 91.
Q: Is the harness wire in good condition?

YES : Replace the manifold differential pressure sensor.

Then go to Step 12.

NO : Repair it. Then go to Step 12.

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AK000280

CONNECTOR : C-40

PCM

AV

ACX02471

CONNECTOR : B-18

MANIFOLD
DIFFERENTIAL
PRESSURE
SENSOR

AG

AK000280

CONNECTOR : C-41

PCM

AY