Mitsubishi Galant. Manual — part 294
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-401
CIRCUIT OPERATION
•
The service engine soon/malfunction indicator
lamp power is supplied from the ignition switch.
•
The PCM controls the ground of the service
engine soon/malfunction indicator lamp by
turning the power transistor in the PCM ON and
OFF.
COMMENT
•
In cases such as the above, the cause is
probably that the PCM is detecting a problem in a
sensor or actuator, or that one of the malfunctions
listed at right has probably occurred.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Short-circuit between the service engine soon/
malfunction indicator lamp and PCM.
•
Malfunction of the PCM.
DIAGNOSIS
Required Special Tool:
MB991502:Scan Tool (MUT-II)
AK000633AC
CONNECTOR:C-29
AK000631AC
CONNECTOR:C-73
AK000631AB
CONNECTOR:C-78
AK000566AB
CONNECTOR:C-17
AK000280
CONNECTOR : C-39
PCM
AW
AK000634 AB
CONNECTOR:C-58
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-402
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. Check the continuity at combination meter
harness side connector C-30.
(1) Disconnect the connector C-30 and measure at the harness
side.
(2) Check for the continuity between terminal 6 and ground.
•
Should be open loop.
Q: Is the continuity normal?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Check harness connectors C-17 at the intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection(
). If intermediate connectors is in
good condition, repair harness wire between
combination meter connector C-30 terminal 6 and
PCM connector C-39 terminal 22 because of short
circuit to ground. Then confirm that the malfunction
symptom is eliminated.
INSPECTION PROCEDURE 5: Cranks, Won't Start
Cranks, Won't Start Circuit
•
Refer to, Ignition circuit (
).
CIRCUIT OPERATION
•
Refer to, Ignition circuit (
).
COMMENT
•
In cases such as the above, the cause is
probably no spark, fuel delivery, or fuel quality
problems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
•
Malfunction of the ignition system.
•
Malfunction of the fuel pump system.
•
Malfunction of the injector system.
•
Malfunction of the PCM.
•
Contaminated fuel.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
AC003081 AB
16 PIN
MB991502
AK000633AC
CONNECTOR:C-29
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-403
STEP 1. Check the Battery positive voltage.
(1) Measure the Battery positive voltage during cranking.
•
The voltage should be 8 volts or more.
Q: Is the voltage normal?
YES : Go to Step 2.
NO : Check the battery. Refer to GROUP 54A, Battery -
Battery check (
). Then confirm that the
malfunction symptom is eliminated.
STEP 2. Check the timing belt for breaks.
Q: Is the timing belt good condition?
YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction
symptom is eliminated.
STEP 3 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 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.
c. Item 21: Engine Coolant Temperature Sensor.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they 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 07: Fuel pump.
(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
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-404
STEP 5. Check the ignition system.
(1) Connect the tachometer to inspection connector A-16X
terminal 3.
(2) Crank the engine.
•
The tachometer should indicate cranking speed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the cranking speed normal?
YES : Go to Step 6.
NO : Refer to INSPECTION PROCEDURE 32
−
Ignition
Circuit System(
STEP 6. Check the ignition timing.
(1) Check the ignition timing at cranking.
Standard value: 5
°°°°
BTDC
±±±±
3
°°°°
Q: Is the ignition timing normal?
YES : Go to Step 7.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
STEP 7. Check the left bank injector.
(1) Disconnect the left bank injector connector B-17, B-21, B-
30.
(2) Measure the resistance between each injector side
connector terminal 1 and 2.
Standard value: 13
−−−−
16 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance standard value?
YES : Go to Step 8.
NO : Replace the faulty injector. Then confirm that the
malfunction symptom is eliminated.
AK000637
CONNECTOR:A-16X
INSPECTION
CONNECTOR
AB
AK000618 AD
CONNECTORS:B-17,B-21,B-30
B-30
B-17
B-21
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
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