Mitsubishi Galant. Manual — part 127

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-189

TECHNICAL DESCRIPTION

•

The EGR solenoid power is supplied from the
MFI relay (terminal 1).

•

The PCM controls the EGR solenoid ground by
turning the power transistor in the PCM "ON" and
"OFF."

BACKGROUND

•

The PCM checks current flows in the EGR
solenoid drive circuit when the EGR solenoid is
"ON" and "OFF."

DTC SET CONDITIONS

Check Conditions

•

Battery positive voltage is higher than 10 volts.

Judgment Criteria

•

The EGR solenoid coil surge voltage (battery
positive voltage + 2 volts) is not detected when
the EGR solenoid is turned from "ON" to "OFF."

•

Only one monitor during one drive cycle

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

EGR solenoid failed.

•

Open or shorted EGR solenoid circuit, or loose
connector.

•

PCM failed.

DIAGNOSIS

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

ACX02513

CONNECTOR : B-03

AG

EGR
SOLENOID
VALVE

AK000280

CONNECTOR : C-39

PCM

AW

AK000564AB

CONNECTOR:B-13

AK000555AB

CONNECTOR : A-21X

MFI RELAY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-190

STEP 1. Using scan tool MB991502, check actuator test
item 10: EGR solenoid.

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) Set scan tool MB991502 to the actuator test mode for item

10, EGR solenoid.

•

An operation sound should be heard and vibration
should be felt when the EGR solenoid is operated.

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

Q: Is the solenoid operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points(

P.00-8

).

NO : Go to Step 2.

STEP 2. Check connector B-03 at the EGR solenoid for
damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

AC003081 AB

16 PIN

MB991502

ACX02513

CONNECTOR : B-03

AG

EGR
SOLENOID
VALVE

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-191

STEP 3 Check the EGR solenoid.
(1) Disconnect the EGR solenoid connector B-03.
(2) Measure the resistance between EGR solenoid side

connector terminal 1 and 2.

Standard value: 29

−−−−

35

Ω

Ω

Ω

Ω

[at 20

°°°°

C (68

°°°°

F)]

Q: Is the resistance at the standard value?

YES : Go to Step 4.
NO : Replace the EGR solenoid. Then go to Step 12.

STEP 4. Check the power supply voltage at EGR solenoid
harness side connector B-03.
(1) Disconnect the connector B-03 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.

•

Voltage should be battery positive voltage

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

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Go to Step 5.

STEP 5. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Check connector B-11 at intermediate connector for

damage, and repair or replace as required. to
GROUP 00E, Harness Connector Inspection(

P.00E-

2

). If intermediate connectors is in good condition,

repair harness wire between MFI relay connector A-
21X terminal 1 and EGR solenoid connector B-03
terminal 1 because of open circuit or short circuit to
ground. Then go to Step 12.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

ACX02513

CONNECTOR : B-03

AG

EGR
SOLENOID
VALVE

AKX00352

AK000254

B-03 HARNESS
SIDE CONNECTOR

1

2

AD

AK000555AB

CONNECTOR : A-21X

MFI RELAY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-192

STEP 6. Check the power supply voltage at PCM connector
C-39 by backprobing
(1) Do not disconnect the connector C-39.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 6 and ground by

backprobing.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Go to Step 9.
NO : Go to Step 7.

STEP 7. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

STEP 8. Check for open circuit and short circuit to ground
between EGR solenoid connector B-03 terminal 2 and PCM
connector C-39 terminal 6.
NOTE: Check harness after checking intermediate connector
B-11.If intermediate connectors is damaged, repair or replace
them.Refer to GROUP 00E, Harness Connector
Inspection(

P.00E-2

).Then go to Step 12.

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

AK000299

C-39 CONNECTOR
HARNESS SIDE VIEW

1
9

24

2

10 11

25

3

12

26

4

13

27

5

19

32

6

20 21
33

7

22
34

8

23
35

14

28

15 16

29

17

30

18

31

AC

AK000280

CONNECTOR : C-39

PCM

AW

ACX02513

CONNECTOR : B-03

AG

EGR
SOLENOID
VALVE

AK000280

CONNECTOR : C-39

PCM

AW