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Mitsubishi Eclipse. Manual - part 581

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-867

DTC P2227: Barometric Pressure Circuit Range/Performance Problem

AK301513

4 5 6

1 2 3

GREEN-YELLO

GREEN-WHITE

ENGINE CONTROL MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL MODULE (PCM) <A/T>

5 V

B-14

BAROMETRIC PRESSURE SENSOR
(INCORPORATED IN VOLUME
AIRFLOW SENSOR)

42 <M/T>*1
46 <A/T>*3

51 <M/T>*1
55 <A/T>*3

34 <M/T>*2
16 <A/T>*4

43
50

42
49

41
48
60 61

46 47
58 59
67 68

56
66

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64 65 66

Barometric Pressure Sensor Circuit

NOTE
*1: ECM connector C-58 <M/T>
*2: ECM connector C-51 <M/T>
*3: PCM connector C-55 <A/T>
*4: PCM connector C-52< A/T>

C-51 <M/T>, C-52 <A/T>
(MU803784)

3 4

5 6

7 8

11 12 13 14 15 16 17 18 19 20

21 22 23

24 25

26 27 28 29

3132 33

34 35

AK300053

CONNECTOR: B-14

BAROMETRIC
PRESSURE
SENSOR

B-14 (B)

AK300091

CONNECTORS: C-51, C-58 <M/T>

ECM

C-51 (GR)

C-58 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-868

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the barometric

pressure sensor power terminal (terminal No. 1)
from the ECM (terminal No. 42) <M/T> or PCM
(terminal No. 46) <A/T>. The ground terminal
(terminal No. 5) is grounded with ECM (terminal
No. 34) <M/T> or PCM (terminal No. 16) <A/T>.

• A voltage that is proportional to the atmospheric

pressure is sent to the ECM (terminal No. 51)
<M/T> or PCM (terminal No. 55) <A/T> from the
barometric pressure sensor output terminal (ter-
minal No. 2).

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The ECM <M/T> or PCM <A/T> checks whether

this voltage is within a specified range.

DESCRIPTIONS OF MONITOR METHODS
Barometric pressure sensor output voltage does not

change for specified period. (approximately 1
week)

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

AK300244

CONNECTORS: C-52, C-55 <A/T>

PCM

C-52 (GR)

C-55 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-869

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Barometric pressure is lower than 76 kPa (11

psi).

Judgement Criteria

• During 15 times of driving, the changes in the

sensor output voltage should be 0.015 volt
[equivalent to 0.4 kPa (0.12 in.Hg)] or less.

• Make sure that the engine coolant temperature is

°C (162°F) or higher during each of the 15

times of driving. Also, during each of the 15 times
of driving, make sure that after the engine has
been started, the engine coolant temperature has
increased for 23

°C (41°F) or higher.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 6

− Other Monitor

P.13B-7

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

• Barometric pressure sensor failed.

• Open or shorted barometric pressure sensor cir-

cuit harness damage, or connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

MONITORING
CONDITIONS

CIRCUIT VOLTAGE

MALFUNCTION

CONTINUOUS

FAILURE FOR 2secs

YES

< 6V

END

GOOD

Yes

AK301455

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-870

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).

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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2228 set?

YES : Refer to, DTC P2228

− Barometric Pressure Circuit

Low Input

P.13B-877

NO : Go to Step 2.

STEP 2. Check connector B-14 at the barometric 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 9.

AK300810

MB991911

16-PIN

MB991827

MB991824

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