Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 213

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-51

TECHNICAL DESCRIPTION

•

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

•

The ECM <M/T> or PCM <A/T> 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 4.45 volts or higher
[corresponding to a barometric pressure of 114
kPa (16.5 psi) or higher] approximately 4,000 ft
below 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.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

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.00-6

).

NO : Go to Step 2.

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-52

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 5.

STEP 3. Check connector B-14 at the barometric pressure
sensor and connector C-58 at ECM <M/T> or connector C-
55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

AKX01520AC

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

ACX02480

CONNECTOR : B-14

AF

BAROMETRIC
PRESSURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AI

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-53

STEP 4. 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.00-6

).

NO : Replace the ECM or PCM. Then go to Step 12.

STEP 5. 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 7.
NO : Go to Step 6.

STEP 6. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Replace the ECM or PCM. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

AKX01177

16 PIN

MB991502

AB

AKX01521AC

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AI

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-54

STEP 7. Check the ground 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 5 and ground by

backprobing.

•

Voltage should be 0.5 volt or less.

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

Q: Is the voltage normal?

YES : Go to Step 10.
NO : Go to Step 8.

STEP 8. Check connector B-14 at the barometric pressure
sensor and connector C-58 at ECM <M/T> or connector C-
55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

AKX01517

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

AC

ACX02480

CONNECTOR : B-14

AF

BAROMETRIC
PRESSURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AI