Mitsubishi Galant (2004+). Manual - part 1195

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-473

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is running.

Judgment Criteria

• Injector coil surge voltage (battery positive volt-

age + 2 volts) has not been detected for 2 sec-
onds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-5

.

.

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

• No. 1 cylinder injector failed.

• Open or shorted No.1cylinder injector circuit, har-

ness damage, or connector damage.

• PCM failed.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

CONTINUOUS

FAILURE FOR 2secs

INJ. SURGE V < V

B

 + 2.0 V

AK204052

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-474

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991658: Test Harness

• MB991923: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check actuator test 
item 01: No. 1 Injector.

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) Start the engine and run at idle.

(3) Set scan tool MB991958 to the actuator testing mode for 

item 01, No. 1 injector.

(4) Warm up the engine to normal operating temperature: 80

°C 

to 95

°C (176°F to 203°F).

• The idle should become slightly rougher.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

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

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

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check harness connector B- 32 at intermediate 
connector 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.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:
COMPONENT SIDE

AB

B-32 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-475

STEP 3. Check the No.1 cylinder injector resistance at 
intermediate connector B-32.

(1) Disconnect the intermediate connector B-32.

(2) Measure the resistance between terminal No. 5 and No. 9.

• Resistance should be between 10.5 and 13.5 ohms.

Q: Is the measured resistance between 10.5 and 13.5 

ohms?
YES : Go to Step 6.
NO :  Go to Step 4.

STEP 4. Check the connector B-01 at No. 1 cylinder 
injector for damage.

Remove the intake manifold.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:
COMPONENT SIDE

AB

B-32 (B)

1

2 3

6

7 8

4 5

9 10

AK303098

B-32 
INTERMEDIATE
CONNECTOR

AB

AK303099

M

1

2

CONNECTOR: B-01

AB

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-476

STEP 5. Check the No. 1 cylinder injector B-01.

(1) Disconnect the No. 1 cylinder injector connector B-01.

(2) Measure the resistance between injector side connector 

terminal No. 1 and No. 2.

Standard value: 10.5 

− 13.5 ohms [at 20°C (68°F)]

Q: Is the resistance between 10.5 and 13.5 ohms [at 20

°C 

(68

°F)]?

YES : Repair harness wire between intermediate connector 

B-32 (terminal No. 9) and injector connector B-01 
(terminal No. 1) and harness wire between No.1 
cylinder injector connector B-01 (terminal No. 2) 
and intermediate connector B-32 (terminal No. 5) 
because of open circuit or short circuit to ground 
or harness damage. 

Then go to Step 12.

NO :  Replace the No.1 cylinder injector. Then go to Step 

12.

STEP 6. Measure the power supply voltage at intermediate 
connector B-32.

(1) Disconnect the connector B-32 and measure at the female 

connector side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 9 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 8.
NO :  Go to Step 7.

AK303099

M

1

2

CONNECTOR: B-01

AB

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:
COMPONENT SIDE

AB

B-32 (B)

3

4

5

8

9

1

2

6

7

10

AK203172

B-32 HARNESS 
CONNECTOR: 
COMPONENT
SIDE

AB