Mitsubishi Lancer Evolution X. Manual — part 353
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-477
.
CIRCUIT OPERATION
• The ECM (terminal No. 114) supplies a 5 volts
reference voltage to the fuel tank differential pres-
sure sensor (terminal No. 3). The ECM (terminal
No. 113) supplies a ground to the fuel tank differ-
ential pressure sensor (terminal No. 2).
• The ECM (terminal No. 112) receives a voltage
signal proportional to the pressure in the fuel tank
from the fuel tank differential pressure sensor
(terminal No. 1).
.
TECHNICAL DESCRIPTION
• To determine whether the fuel tank differential
pressure sensor is defective, the ECM monitors
the fuel tank differential pressure sensor output
voltage.
• The ECM judges if the fuel tank differential pres-
sure sensor output voltage is normal.
NOTE: In rare cases, this DTC may be also set
under some fuel and driving conditions regardless of
the fuel pressure sensor output voltage when the fuel
system is clogged.
.
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
.
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-478
DTC SET CONDITIONS
Logic Flow Chart (Monitor Sequence)
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
• The fuel temperature is 36° C (97° F) or less.
• Remaining fuel level is 85 percent or less when
the engine is started.
Judgement Criterion
• The fuel tank differential pressure sensor output
voltage remains 4.8 volts or greater for 5 sec-
onds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Fuel tank differential pressure sensor failed.
• Open fuel tank differential pressure sensor cir-
cuit, or 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
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-479
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) Disconnect hose E from the evaporative emission canister,
and plug the hose.
(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
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-480
(6) Connect the evaporative emission system pressure pump
(Miller number 6872A) to the fuel tank filler tube by using
fuel tank adapter (MLR-8382) and pressurize the fuel tank.
• The fuel tank pressure reading should increase.
(7) Turn the ignition switch to the "LOCK" (OFF) position. Then
disconnect scan tool MB991958.
(8) Remove the evaporative emission system pressure pump
(Miller number 6872A) and the fuel tank adapter
(MLR-8382), and reinstall the fuel cap.
(9) Connect hose E to the evaporative emission canister.
Q: Is the sensor operating ptoperly?
YES : It can be assumed that this malfunction is intermittent.
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to
Cope with Intermittent Malfunctions
).
NO : Go to Step 2 .
STEP 2. Measure the ground voltage at fuel tank
differential pressure sensor connector D-21 by
backprobing.
(1) Do not disconnect the connector D-21.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 and ground by
backprobing.
• Voltage should be 0.5 volt or less.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?
YES : Go to Step 6 .
NO : Go to Step 3 .
STEP 3. Check harness connector D-21 at the fuel tank
differential pressure sensor and harness connector B-10
at ECM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4 .
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 7 .
STEP 4. Check for open circuit between fuel tank
differential pressure sensor connector D-21 (terminal No.
2) and ECM connector B-10 (terminal No. 113).
NOTE: Check harness after checking intermediate connector
C-47. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection
Then go to Step 7 .
Q: Is the harness wire in good condition?
YES : Go to Step 5 .
NO : Repair it. Then go to Step 7 .
AK704700
3
2
1
AK704396
D-21 harness
connector:
harness side
AC
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