Mitsubishi Eclipse. Manual - part 221

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-377

DTC P0201: Injector Circuit 

− Cylinder 1, DTC P0202: Injector Circuit − Cylinder 2, DTC P0203: Injector 

Circuit 

− Cylinder 3, DTC P0204: Injector Circuit − Cylinder 4

AK101515

2

1

2

1

2

1

2

1

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

RED

RED

RED

RED

YELL

OW

-

BL

UE

YELL

OW

-

RED

YELL

OW

-

BL

ACK

GREEEN-

YELL

OW

BATTERY

MFI
RELAY

INJECTOR
NO. 1

INJECTOR
NO. 2

INJECTOR
NO. 3

INJECTOR
NO. 4

B-01

B-02

B-05

B-06

4

1

1

1

1

2

2

2

2

3

1

2

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

1 <M/T>
1 <A/T>

14 <M/T>
9 <A/T>

2 <M/T>
24 <A/T>

15 <M/T>
2 <A/T>

C-49 <M/T>
(MU803773)

C-50 <A/T>
(MU803784)

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

3

10 11

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

Injector Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-378

.

CIRCUIT OPERATION

• The injector power is supplied from the MFI relay 

(terminal No. 4).

• The ECM <M/T> or PCM <A/T> controls the 

injector by turning the power transistor in the 
ECM <M/T> or PCM <A/T> "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The amount of fuel injected by the injector is con-

trolled by the amount of continuity time the coil is 
grounded by the ECM <M/T> or PCM <A/T>.

• A surge voltage is generated when the injectors 

are driven and the current flowing to the injector 
coil is shut off.

• The ECM <M/T> or PCM <A/T> checks this 

surge voltage.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after injector is operated.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable sensor

.

AK300736

CONNECTORS: B-01, B-02, B-05, B-06

AB

B-02 (GR)

B-01 (GR)

B-05 (GR)

B-06 (GR)

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300060

ECM

CONNECTOR: C-49 <M/T>

AC

C-49 (G)

AK300060AD

C-50 (GR)

PCM

CONNECTOR: C-50 <A/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-379

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is running.

• Throttle position sensor output voltage is lower 

than 1.16 volts.

Judgment Criteria

• Injector coil surge voltage (battery positive volt-

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

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-5

.

.

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

• Injector failed.

• Open or shorted injector circuit, harness damage 

or connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991348: Test Harness Set

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) <2.4L>

13A-380

STEP 1. Using scan tool MB991958, check actuator test 
item 01, 02, 03, 04: Injectors.

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, 02, 03, 04 Injectors.

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

°C 

to 96

°C (176°F to 205°F).

• Does the idle state worsen when the injector is cut off.

(Does idling become unstable or does the engine stall.)

(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 the connector at injector for damage.

a. Check the connector B-01 when checking No. 1 cylinder.
b. Check the connector B-02 when checking No. 2 cylinder.

c. Check the connector B-05 when checking No. 3 cylinder.

d. Check the connector B-06 when checking No. 4 cylinder.

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 10.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300737

1

2

CONNECTORS: B-01, B-02, B-05, B-06

AB

B-02 (GR)

B-01 (GR)

B-05 (GR)

B-06 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE