Mitsubishi Lancer Evolution X. Manual - part 350

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-465

DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input

AK704684

L

A

B

C

D

E

F

H

G

I

J

K

AB

Intake manifold

Fuel tank

Check valve

Evaporative emission
purge solenoid

Evaporative emission
ventilation solenoid

Evaporative emission
canister

Fuel tank differential 
pressure sensor

System diagram

Air filter

Vent pipe

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-466

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

AK604513

3

2

1

17

15

16

114

113

112

5 V

AE

D-21

(MU802723)

C-47

B-10

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

FUEL TANK DIFFERENTIAL PRESSURE SENSOR CIRCUIT

ENGINE CONTROL
MODULE

WHITE

WHITE

BLA

CK

BLA

CK

BR

O

WN

BR

O

WN

AK704235 AB

Connector: B-10

ECM

B-10 (GR)

AK704252

Connector: C-47

C-47

AB

AK704595 AB

Fuel tank differential
pressure sensor

Connector: D-21

D-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-467

.

CIRCUIT OPERATION

• The ECM (terminal No. 114) supplies a 5 volts 

reference signal to the fuel tank differential pres-
sure sensor (terminal No. 3). The fuel tank differ-
ential 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

Fuel tank differential pressure sensor output voltage 
is out of specified range.

.

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 tank 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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-468

DTC SET CONDITIONS

Logic Flow Chart (Monitor Sequence)

.

Check Condition

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgement Criterion

• The fuel tank differential pressure sensor output 

voltage remains 0.2 volt or less for 5 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CODE TO BE 
SET ARE:)

• Fuel tank differential pressure sensor failed.
• Open or shorted fuel tank differential pressure 

sensor circuit, connector damage.

• ECM failed.

AK704952

No

Continuous

failure for 5 secs

Start

End

No 

No

Yes

Yes

Malfunction

Good

Output voltage

< 0.2V

Output voltage

> 4.8V

Yes

No

Yes

Monitoring
conditions