Mitsubishi Lancer Evolution X. Manual - part 346

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-449

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-450

.

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

Compare evaporative emission purge solenoid sta-
tus with fuel tank differential 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 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

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MULTIPORT FUEL INJECTION (MFI)

13A-451

DTC SET CONDITIONS
Logic Flow Chart (Monitor Sequence)

.

Check Conditions

• Intake air temperature is more than 5° C (41° F).
• Engine speed is more than 1,594 r/min.
• Volumetric efficiency is between 20 and 50 per-

cent.

Judgement Criterion

• When the evaporative emission purge solenoid is 

off, the fuel differential pressure sensor output 
voltage is less than 1.0 volt for 10 seconds.

Check Conditions 

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

and 45° C (113° F).

• Engine speed is more than 1,594 r/min.

• Volumetric efficiency is between 20 and 50 per-

cent.

Judgement Criterion

• When the evaporative emission purge solenoid is 

fully operational (100 percent ratio), the fuel dif-
ferential pressure sensor output voltage is more 
than 4.0 volts for 10 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-ll Drive Cycle − 

Pattern 4 

P.13A-9

.

.

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-452

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

• Fuel tank differential pressure sensor failed.

• Fuel tank differential pressure sensor circuit har-

ness damage, or connector damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check data list item 52: 
Fuel Tank Differential Pressure Sensor.

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) Plug the disconnected end of hose E.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode for item 

52, Fuel Tank Differential Pressure Sensor.

• Output voltage should be between 1,500 to 3,500 mV.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK704692 AB

Plug

Hose E