Mitsubishi 380. Manual — part 622
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-580
STEP 7. Using diagnostic tool, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of the data list. Refer to Data List
.
a. Item AC: Right Bank Heated Oxygen Sensor (front).
b. Item AE: Left Bank Heated Oxygen Sensor (front).
• Fluctuates between 0 − 0.4 volt and 0.6 − 1.0 volt while
idling after the engine has been warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Vacuum leak.
• Broken intake manifold gasket.
• Broken air intake hose.
• Broken vacuum hose.
• Positive crankcase ventilation valve does
not operate.
b. Injector clogged.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-581
STEP 9. Check the advance ignition timing.
Ignition timing is controlled by the ENGIN-ECUand will vary
depending on engine requirement..
Q: Is the advance ignition timing normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil and spark plugs.
b. Check compression pressure.
c. Check the engine oil viscosity.
Then confirm that the malfunction symptom is
eliminated.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
INSPECTION PROCEDURE 13: The Engine Stalls when Accelerating (Pass Out).
.
COMMENT
• In case such as the above, the cause is probably
misfiring due to a weak spark, or an inappropriate
air/fuel mixture when the accelerator pedal is
depressed.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Vacuum leak.
• Malfunction of the ignition system.
• Malfunction of emission control system.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• Diagnostic tool(MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-582
STEP 1. Using diagnostic tool, read the diagnostic trouble
code (DTC).
CAUTION
To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool.
(1) Connect diagnostic tool 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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 2.
STEP 2. Using diagnostic tool, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following item in the actuator test. Refer to
Actuator Test Reference Table
.
a. Item 10: Evaporative Emission Purge Solenoid.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs.
b. Check for vacuum leaks.
• Broken intake manifold gasket.
• Broken or disconnected vacuum hose.
• Improper operation of the PCV valve.
• Broken air intake hose.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-583
INSPECTION PROCEDURE 14: The engine stalls when decelerating.
.
COMMENT
• The intake air volume may be insufficient due to a
defective the electronic control throttle valve sys-
tem.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the electronic control throttle valve
system.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• Diagnostic tool(MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?
YES : Start the engine and let it run at idle for approximate
10 minutes after engine warm up. Then if a
malfunction occurs, go to step 2.
NO : Go to Step 2.
STEP 2. Using diagnostic tool, read the diagnostic trouble
code (DTC).
CAUTION
To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool.
(1) Connect diagnostic tool 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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 3.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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