Mitsubishi Galant. Manual — part 204

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-41

TECHNICAL DESCRIPTION

•

The barometric pressure sensor outputs a
voltage which corresponds to the barometric
pressure.

•

The PCM checks whether this voltage is within a
specified range.

DTC SET CONDITIONS

Check Conditions

•

Two seconds or more have passed since the
starting sequence was completed.

•

Battery positive voltage is higher than 8 volts.

Judgement Criteria

•

Barometric pressure sensor output voltage has
continued to be 1.95 volts or lower
[corresponding to a barometric pressure of 50
kPa (7.3 psi) or lower] approximately 15,000 ft
above sea level for 10 seconds.

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

•

Barometric pressure sensor failed.

•

Open or shorted barometric pressure sensor
circuit, or loose connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 25:
Barometric 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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

25, Barometric Pressure Sensor.

•

When altitude is 0 m(0 foot), 101 kPa.

•

When altitude is 600 m(1,969 feet), 95 kPa.

•

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

•

When altitude is 1,800 m(5,906 feet), 81 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 : NO: Go to Step 2.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-42

STEP 2. Check the sensor output voltage at barometric
pressure sensor connector B-14 by backprobing.
(1) Do not disconnect the connector B-14.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and ground by

backprobing.

•

When altitude is 0 m(0 foot), voltage should be 3.7 and
4.3 volts.

•

When altitude is 600 m(1,969 feet), voltage should be
3.4 and 4.0 volts.

•

When altitude is 1,200 m(3,937 feet), voltage should be
3.2 and 3.8 volts.

•

When altitude is 1,800 m(5,906 feet), voltage should be
2.9 and 3.5 volts.

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

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 7.

STEP 3. Check the sensor output voltage at PCM
connector C-40 by backprobing.
(1) Do not disconnect the connector C-40.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 55 and ground by

backprobing.

•

When altitude is 0 m(0 foot), voltage should be 3.7 and
4.3 volts.

•

When altitude is 600 m(1,969 feet), voltage should be
3.4 and 4.0 volts.

•

When altitude is 1,200 m(3,937 feet), voltage should be
3.2 and 3.8 volts.

•

When altitude is 1,800 m(5,906 feet), voltage should be
2.9 and 3.5 volts.

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

Q: Is the voltage normal?

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

AKX01520AC

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

AK000282

C-40 CONNECTOR
HARNESS SIDE VIEW

46
57
66

45
56
65

44
55

43
49

54

64

42
48
59

41
47
58

53
63

52
62

51
61

50
60

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-43

STEP 4. Check connector B-14 at the barometric pressure
sensor and 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 18.

STEP 5. Using scan tool MB991502, check data list item 25:
Barometric 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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

25, Barometric Pressure Sensor.

•

When altitude is 0 m(0 foot), 101 kPa.

•

When altitude is 600 m(1,969 feet), 95 kPa.

•

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

•

When altitude is 1,800 m(5,906 feet), 81 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 : Replace the PCM. Then go to Step 18.

ACX02480

CONNECTOR : B-14

AF

BAROMETRIC
PRESSURE
SENSOR

AK000280

CONNECTOR : C-40

PCM

AV

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-44

STEP 6. Check connector B-14 at the barometric pressure
sensor and connector C-40 at connector C-40 at PCM for
damage.
Q: Is the connector in good condition?

YES : Repair harness wire between barometric pressure

sensor connector B-14 terminal 2 and PCM connector
C-40 terminal 55 because of open circuit or harness
damage. Then go to Step 18.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 18.

STEP 7. Check the sensor supply voltage at barometric
pressure sensor connector B-14 by backprobing.
(1) Do not disconnect the connector B-14.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground by

backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the voltage normal?

YES : Go to Step 12.
NO : Go to Step 8.

STEP 8. Check the sensor supply voltage at PCM
connector C-40 by backprobing.
(1) Do not disconnect the connector C-40.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 46 and ground by

backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the voltage normal?

YES : Go to Step 9.
NO : Go to Step 10.

ACX02480

CONNECTOR : B-14

AF

BAROMETRIC
PRESSURE
SENSOR

AK000280

CONNECTOR : C-40

PCM

AV

AKX01521AC

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

AK000284

C-40 CONNECTOR
HARNESS SIDE VIEW

46
57
66

45
56
65

44
55

43
49

54

64

42
48
59

41
47
58

53
63

52
62

51
61

50
60

AC