Mitsubishi Galant 9G. Manual — part 1191
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1064
STEP 6. 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.
STEP 7. 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. Check the ignition coil and spark plugs.
b. Check the EGR system.
c. Check compression pressure.
d. Check the fuel filter or fuel line for clogging.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
INSPECTION PROCEDURE 16: Acceleration shock.
.
COMMENT
• There may be an ignition leak accompanying the
increase in the spark plug demand voltage during
acceleration or the electronic control throttle
valve system failed.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the ignition system.
• Malfunction of the electronic control throttle valve
system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-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) <3.8L ENGINE>
13B-1065
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 The DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil and spark plugs.
b. Check for occurrence of ignition leak.
Then confirm that the malfunction symptom is
eliminated.
INSPECTION PROCEDURE 17: Deceleration Shock
.
COMMENT
• There may be a sudden change in air flow
through the throttle valve, causing the vehicle to
decelerate rapidly for an instant.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the electronic control throttle valve
system.
• Dirtiness around throttle valve.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1066
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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Refer to On-vehicle Service
− Throttle Body (Throttle
Valve Area) Cleaning
INSPECTION PROCEDURE 18: Poor acceleration.
.
COMMENT
• Defective ignition system, abnormal air/fuel ratio,
the electronic control throttle valve system, poor
compression pressure, etc. are suspected.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the ignition system.
• Malfunction of air/fuel ratio control system.
• Malfunction of the electronic control throttle valve
system.
• Malfunction of the fuel supply system.
• Poor compression pressure.
• Clogged exhaust system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1067
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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check actuator test
items 01, 02, 03, 04, 05, 06: Injector.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to Actuator
Test Table
a. Item 01, 02, 03, 04, 05, 06: Injector.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are thy operating properly?
YES : Go to Step 3.
NO : Refer to DTC P0201
, P0202
,
P0203
,
P0205
, P0206
− Injector Circuit.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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