Mitsubishi Galant. Manual — part 167
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-349
STEP 11. Using scan tool MB991502, check data list.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the following items in the data list. Refer to, Data List
Reference Table(
).
a. Item 45: Idle Air Control Motor Position.
(4) 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. 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 : Adjusting the basic idle speed. Refer to, Basic Idle
Speed Adjustment(
).
STEP 12. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service
−
Ignition Timing
Check (
Q: Is the ignition timing normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check if the injectors are clogged.
c. Check compression pressure.
d. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is
eliminated.
NO : Check that the crankshaft position sensor and timing
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
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Vacuum leak.
•
Malfunction of the ignition system.
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-350
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?
YES : Refer to, Diagnostic Trouble Code Chart(
).
NO : Go to Step 2.
STEP 2. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to,
Actuator Test Reference Table(
a. Item 10: EGR 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, spark plug
cables.
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. Then confirm that the malfunction
symptom is eliminated.
INSPECTION PROCEDURE 14: The engine stalls when decelerating.
COMMENT
•
The intake air volume may be insufficient due to a
defective idle air control motor system.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the IAC system.
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-351
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 scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?
YES : Refer to, Diagnostic Trouble Code Chart(
).
NO : Go to Step 3.
STEP 3. Using scan tool MB991502, 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
Reference Table(
).
a. Item 14: Throttle Position 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. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Using scan tool MB991502, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to,
Actuator Test Reference Table(
a. Item 10: EGR Solenoid.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 5.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-352
STEP 5. Using scan tool MB991502, check data list item 45:
Idle Air Control Position.
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item
45, Idle Air Control Position.
a. The idle air control motor should drop to the 0 - 2
position during deceleration (from 1,000 r/min or more).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operation properly?
YES : Check the following items, and repair, replace or
clean the defective sections.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check the throttle valve area. (refer to
Then confirm that the malfunction symptom is
eliminated.
NO : Refer to, DTC P0500
−
Vehicle Speed Sensor
Malfunction (
INSPECTION PROCEDURE 15: Hesitation, sag or stumble.
COMMENT
•
In cases such as the above, the ignition system,
air/fuel mixture or compression pressure may be
defective.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the ignition system.
•
Malfunction of air/fuel ratio control system.
•
Malfunction of the fuel supply system.
•
Malfunction of the EGR solenoid system.
•
Poor compression pressure.
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 is output?
YES : Refer to, Diagnostic Trouble Code Chart(
).
NO : Go to Step 2.
AC003081 AB
16 PIN
MB991502
AC003081 AB
16 PIN
MB991502
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