Mitsubishi Lancer Evolution X. Manual — part 417
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-733
Inspection procedure 10: When the engine is cold, it stalls at idle (die out)
.
COMMENT
• In such cases as the above, the air/fuel mixture
may be inappropriate when the engine is cold.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the fuel pump system.
• Malfunction of the ignition system.
• Poor compression.
• Improper engine oil viscosity.
• Malfunction of the ECM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is any DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to Actuator
Test Reference Table
.
a. Item 1: Injector.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 3.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-734
STEP 3. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List
.
a. Item 6: Engine Coolant Temperature Sensor.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 4.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service − Ignition Timing
Check
.
Q: Is the ignition timing normal?
YES : Go to Step 5.
NO : Check for installed conditions of the timing chain.
Then confirm that the malfunction symptom is
eliminated.
STEP 5. Check the fuel pressure.
Refer to Fuel Pressure Test
.
Q: Is the fuel pressure normal?
YES : Go to Step 6.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 6. Check the spark plugs.
Refer to GROUP 16, Ignition System − On-vehicle Service −
Spark Plug Check And Cleaning
.
Q: Are there any abnormalities?
YES : Replace the spark plug. Then confirm that the
malfunction symptom is eliminated.
NO : Go to Step 7.
STEP 7. Check the ignition coil.
Refer to GROUP 16, Ignition System − On-vehicle Service −
.
Q: Are there any abnormalities?
YES : Replace the ignition coil. Then confirm that the
malfunction symptom is eliminated.
NO : Go to Step 8.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-735
STEP 8. Check the compression pressure.
Refer to GROUP 11A, On-vehicle Service − Compression Pres-
.
Q: Is the compression pressure normal?
YES : Check the engine oil viscosity, and replace the engine
oil.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
Inspection procedure 11: When the engine is hot, it stalls at idle (die out)
.
COMMENT
• In cases such as the above, the ignition system,
air/fuel mixture or compression pressure may be
faulty. In addition, if the engine suddenly stalls,
the cause may also be a connector damage.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the fuel pump system.
• Malfunction of the ignition system.
• Poor compression
• Improper operation of the PCV valve.
• Vacuum leak.
• Dirtiness around throttle valve.
• Malfunction of the ECM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-736
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is any DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check actuator test
item 1: injector.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to Actuator
Test Reference Table
.
a. Item 1: Injector.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 3.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 3. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List
.
a. Item 5: Intake Air Temperature Sensor.
b. Item 6: Engine Coolant Temperature Sensor.
c. Item 13: Throttle position sensor (main).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 4.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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