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Mitsubishi Lancer Evolution X. Manual - part 348

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-457

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

AK604513

114

113

112

5 V

D-21

(MU802723)

C-47

B-10

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

FUEL TANK DIFFERENTIAL PRESSURE SENSOR CIRCUIT

ENGINE CONTROL
MODULE

WHITE

BLA

AK704235 AB

Connector: B-10

ECM

B-10 (GR)

AK704252

Connector: C-47

C-47

AK704595 AB

Fuel tank differential
pressure sensor

Connector: D-21

D-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-458

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 signal voltage.

• The ECM determines whether the fuel tank differ-

ential pressure sensor signal voltage is within
normal operating parameters.

DESCRIPTIONS OF MONITOR METHODS

Detect malfunction if change of fuel tank differential
pressure sensor output voltage during idling stays
large during specified go/stop operations.

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-459

DTC SET CONDITIONS
Logic Flow Chart (Monitor Sequence)

Check Conditions

• Accelerator pedal is not depressed.
• Vehicle speed is less than 1.5 km/h (1 mph).

NOTE: The conditions for deviating from idling
operation are as follows:

•

Vehicle speed is more than 50 km/h (31 mph).

Judgement Criteria

• The drastic pressure fluctuation is detected 20

times or more per engine idling, which is that the
fuel tank differential pressure sensor output volt-
age is 0.2 volt or more.

• The condition described above is consecutively

detected 4 times under the normal driving condi-
tions.

AK705072

Start

Off-idling condition

Idling condition?

F1 = 0

Off-idling condition

Yes

End

Malfunction

F1 > 20

FTPS output voltage

fluctuation > 0.2V

Yes

F1 = F1 + 1

Good

Yes

Specified times

monitored

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-460

NOTE: If the number of sudden pressure fluctua-
tions does not reach 20 times during any one
period of engine idling, or if the ignition switch is
turned OFF, the counter will reset to 0.

FAIL-SAFE AND BACKUP FUNCTION

• None

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-ll Drive Cycle −

Pattern 15

P.13A-9

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

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