Mitsubishi Lancer Evolution X. Manual — part 351
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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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
• MB992110: Power Plant ECU Check Harness
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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(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 properly?
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 sensor supply 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. 3 and ground by
backprobing.
• Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 8 .
NO : Go to Step 3 .
STEP 3. Check 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 12 .
AK704700
3
2
1
AK704395
D-21 harness
connector:
harness side
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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STEP 4. Measure the sensor supply voltage at ECM
connector B-10 by using power plant ECU check harness
special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant
ECU check harness special tool MB992110 between the
separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 114 and ground.
• Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 7 .
NO : Go to Step 5 .
STEP 5. Check harness connector D-21 at the fuel tank
differential pressure sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6 .
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12 .
STEP 6. Check for short circuit to ground between fuel
tank differential pressure sensor connector D-21 (terminal
No. 3) and ECM connector B-10 (terminal No. 114).
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 12.
Q: Is the harness wire in good condition?
YES : Go to Step 11 .
NO : Repair it. Then go to Step 12 .
AK604171
ECM
AB
Body side harness
MB992110
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AK704397 AB
Power plant ECU
check harness connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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STEP 7. Check harness connector D-21 at the fuel tank
differential pressure sensor for damage.
Q: Is the harness connector in good condition?
YES : Check harness connector C-47 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between fuel tank
differential pressure sensor connector D-21 (terminal
No. 3) and ECM connector B-10 (terminal No. 114)
because of open circuit. Then go to Step 12 .
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12 .
STEP 8. Check harness connector D-21 at the fuel tank
differential pressure sensor and connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9 .
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12 .
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