Mitsubishi Outlander GS45X. Manual - part 891

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-497

DTC P0450: Evaporative Emission Control System Pressure Sensor Malfunction

AK901211

AB

I

A

C

E

D

F

G

H

Air filter

B

System diagram

Intake manifold

Evaporative emission
purge solenoid

Fuel tank

Evaporative
emission canister

Fuel tank differential
pressure sensor

Vent pipe

Evaporative emission
ventilation solenoid

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-498

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

2

8

7

6

5

4

3

11

21

20

19

18

17

16

15

14

13

12

9

22

1

10

3

2

1

AK704184

3

2

1

4

2

3

114

113

112

5 V

AB

D-19

(MU802723)

C-129

B-11

ENGINE 
CONTROL 
MODULE

FUEL TANK DIFFERENTIAL PRESSURE SENSOR CIRCUIT

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

YELLO

W

-BLA

CK

YELLO

W

-BLA

CK

BR

O

W

N

B

R

O

WN

RED-GREEN

RED-GREEN

AK704190

ECM

B-11 (GR)

Connector: B-11

AB

AK900595

Connector: C-129

C-129

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-499

.

CIRCUIT OPERATION

• The ECM (terminal No. 114) supplies a 5-volt ref-

erence signal to the fuel tank differential pressure 
sensor (terminal No. 3). The fuel tank differential 
pressure sensor (terminal No. 2) is grounded 
through the ECM (terminal No. 113).

• The fuel tank differential pressure sensor (termi-

nal No. 1) returns a voltage signal to the ECM 
(terminal No. 112) that is proportional to the pres-
sure in the fuel tank.

.

TECHNICAL DESCRIPTION

• The ECM monitors the fuel tank differential pres-

sure sensor output voltage.

• The ECM determines whether the fuel tank differ-

ential pressure sensor signal voltage is within 
normal operating parameters.

.

DESCRIPTIONS OF MONITOR METHODS

• Compare purge solenoid status with fuel tank dif-

ferential 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)

• Evaporative emission purge solenoid monitor

• Evaporative emission ventilation solenoid monitor

• Fuel temperature sensor monitor

• Fuel level sensor monitor

 Sensor (The sensors below are determined to be 

normal)

• Mass airflow sensor

• Barometric pressure sensor

• Intake air temperature sensor

• Engine coolant temperature sensor

• Accelerator pedal position sensor

.

AK704189

Fuel tank differential
pressure sensor

D-19

Connector: D-19

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-500

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Intake air temperature is greater than 5°C (41°F).

• Engine speed is 1,594 r/min or greater.

• Volumetric efficiency is between 20 and 60 per-

cent.

Judgement Criteria

• When the evaporative emission purge solenoid is 

off, the fuel tank differential pressure sensor out-
put voltage remains 1.0 volt or less for 10 sec-
onds.

Check Conditions 

• Intake air temperature is between 5°C (41°F) and 

45

°C (113°F).

• Engine speed is 1,594 r/min or greater.

• Volumetric efficiency is between 20 and 60 per-

cent.

Judgement Criterion

• When the evaporative emission purge solenoid 

valve is fully operational (100 percent ratio), the 
fuel tank differential pressure sensor output volt-
age remains at 4.0 volts or greater for 10 sec-
onds.

.

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Pattern 5 

P.13B-11

.

.

AK704950

No

Yes

Continuous

failure for 10 secs

Start

End

No 

No

No

Yes

Yes

Malfunction

Good

Monitoring
conditions

Output voltage

< 1.0V

Output voltage

> 4.0V

Yes