Mitsubishi Galant. Manual — part 162

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-329

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(

P.13A-20

).

NO : Go to Step 3.

STEP 3. 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(

P.13A-416

).

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 4.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 4. 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(

P.13A-405

).

a. Item 21: Engine Coolant Temperature Sensor.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : Go to Step 5.
NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 5. Check the engine start-ability.
(1) Depress the accelerator pedal slightly, and start the engine.

Q: Is the start ability good?

YES : Go to Step 6.
NO : Go to Step 7.

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 6. Check the idle air control (IAC) motor operation
sound.
(1) Check that the engine coolant temperature is 20

°

C (68

°

F)

or below.

NOTE: If necessary, you can disconnect the engine coolant
temperature sensor connector and connect the harness
side of the connector to another engine coolant temperature
sensor that is at 20

°

C(68

°

F) or below.

(2) Check that the operation sound of the IAC motor can be

heard after the ignition is switched to the "ON" position (but
without starting the engine).

•

An operation sound is heard.

Q: Did you hear the operation sound?

YES : Refer to, Clean the throttle valve area(

P.13A-436

).

NO : Refer to DTC P0506 Idle Control System RPM Lower

Than Expected(

P.13A-265

), DTC P0507 Idle Control

System RPM Higher Than Expected(

P.13A-274

).

STEP 7. Check the ignition timing.
(1) Check the ignition timing at cranking.

Standard value: 5

°°°°

BTDC

φφφφ

3

°°°°

Q: Is the ignition timing normal?

YES : Go to Step 8.
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 8. Check harness connector B-17 or B-19 or B-21 or
B-22 at injector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

ACX02519 AH

IDLE AIR
CONTROL MOTOR

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-331

STEP 9. Check the injector.
(1) Disconnect the injector connector B-17, B-19, B-21, B-22.
(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 10.
NO : Repair the injector. Then confirm that the malfunction

symptom is eliminated.

STEP 10. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 11. Check for harness damage between injector
connector and PCM connector.

a. Check the harness wire between injector connector B-22

terminal 2 and PCM connector C-39 terminal 1 when
checking No.1 cylinder.

b. Check the harness wire between injector connector B-21

terminal 2 and PCM connector C-39 terminal 9 when
checking No.2 cylinder.

c. Check the harness wire between injector connector B-19

terminal 2 and PCM connector C-39 terminal 24 when
checking No.3 cylinder.

d. Check the harness wire between injector connector B-17

terminal 2 and PCM connector C-39 terminal 2 when
checking No.4 cylinder.

Q: Is the harness wire in good condition?

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 fuel lines for clogging.
e. Check if the foreign materials (water,

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

INSPECTION PROCEDURE 7: Hard Starting

COMMENT

•

In cases such as the above, the cause is usually
either weak spark, improper air-fuel mixture or
low compression.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

•

Malfunction of the ignition system.

•

Malfunction of the injector system.

•

Poor fuel quality. (Contamination)

•

Poor compression.

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

•

The voltage is 8 volts or more.

Q: Is the voltage normal?

YES : Go to Step 2.
NO : Refer to GROUP 54A, Battery

−

Battery check(

P.54A-

5

).

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

AK000280

CONNECTOR : C-39

PCM

AW