Mitsubishi Eclipse. Manual - part 492

 

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Mitsubishi Eclipse. Manual - part 492

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-511

.

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

.

AK300086

CONNECTORS: B-01, B-05, B-26

AB

B-05 (GR)

B-26 (GR)

B-01 (GR)

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300085

CONNECTOR: B-48

AB

B-48 (B)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-512

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-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-7

.

.

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: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MD998464: Test Harness

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) <3.0L>

13B-513

STEP 1. Using scan tool MB991958, check actuator test 
item 01, 03, 05: 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, 03, 05 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 connector B-48 at injector 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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300751

1

2

3

4

CONNECTOR: B-48

AB

B-48 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-514

STEP 3. Check the injector resistance at injector 
intermediate connector B-48.
(1) Disconnect the injector intermediate connector B-48.

(2) Measure the resistance between each male connector side 

terminal.

a. Measure the resistance between terminal No. 1 and No. 

2 when measuring No. 1 cylinder.

b. Measure the resistance between terminal No. 1 and No. 

3 when measuring No. 3 cylinder.

c. Measure the resistance between terminal No. 1 and No. 

4 when measuring No. 5 cylinder.

• Resistance should be between 13 and 16 ohms.

Q: Is the measured resistance between 13 and 16 ohms?

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

STEP 4. Check the connector at injector for damage.
(1) Remove the intake manifold.

a. Check the connector B-01 when checking No. 1 cylin-

der.

b. Check the connector B-05 when checking No. 3 cylin-

der.

c. Check the connector B-26 when checking No. 5 cylin-

der.

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.

AK300751

1

2

3

4

CONNECTOR: B-48

AB

B-48 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000240AB

INJECTOR
INTERMEDIATE
CONNECTOR

1 2
3 4

AK300752

1

2

CONNECTORS: B-01, B-05, B-26

AB

B-05 (GR) B-26 (GR)

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

 

 

 

 

 

 

 

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