Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 324

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-495

AK000734 AB

CONNECTOR:D-16

AK000315

CONNECTOR:C-101

AC

AK000360AB

CONNECTOR : A-20X

AK000345AE

CONNECTOR:C-89

AK000225

CONNECTOR : C-51<M/T>, C-52<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

AK000312AJ

CONNECTOR:C-07

AK000219

CONNECTOR:C-87

AC

AK000733AC

CONNECTOR:C-28

AK000345

CONNECTOR:C-90

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-496

CIRCUIT OPERATION

•

A battery positive voltage is applied on the fuel
pump relay (terminal 3, 4) from the ignition
switch-IG.

•

During cranking and while the engine is running,
the ECM <M/T> or PCM <A/T> turns the power
transistor in the ECM <M/T> or PCM <A/T> ON
to ground the fuel pump relay coil. With this, the
fuel pump relay turns ON, and the battery positive
voltage is supplied to the fuel pump from the fuel
pump relay (terminal 1).

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

））

）

•

Malfunction of the fuel pump relay.

•

Malfunction of the fuel pump.

•

Improper connector contact, open or short-
circuited harness wire.

•

Malfunction of the ECM <M/T> or PCM <A/T>.

DIAGNOSIS

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

STEP 1. Using scan tool MB991502, check actuator test
item 07: Fuel Pump.

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

07, Fuel Pump.

•

An operation sound of the fuel pump should be heard.

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

Q: Is the fuel pump operating properly?

YES : 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 D-17 at fuel pump 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 confirm that

the malfunction symptom is eliminated.

AKX01177

16 PIN

MB991502

AB

AK000734AC

CONNECTOR:D-17

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-497

STEP 3 Check the fuel pump operation.
(1) Disconnect fuel pump connector D-17.
(2) Use jumper wires to connect fuel pump connector terminal

5 to the positive battery terminal and terminal 4 to the
negative battery terminal.

•

An operating sound of the fuel pump should be heard.

Q: Is the fuel pump operating properly?

YES : Go to Step 4.
NO : Replace the fuel pump Then confirm that the

malfunction symptom is eliminated.

STEP 4. Check the continuity at fuel pump harness side
connector D-17.
(1) Disconnect the connector D-17 and measure at the harness

side.

(2) Check for the continuity between terminal 4 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 5.
NO : Repair harness wire between fuel pump connector D-

17 terminal 4 and ground because of open circuit or
harness damage. Then confirm that the malfunction
symptom is eliminated.

STEP 5. Check connector A-20X at fuel pump relay for
damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

AKX01439

FUEL PUMP SIDE
CONNECTOR

AB

1 2 3

4 5

AKX01440AC

1

2

3

4

5

D-17 HARNESS
SIDE CONNECTOR

AK000360AB

CONNECTOR : A-20X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-498

STEP 6. Check the fuel pump relay
(1) Remove the fuel pump relay.
(2) Check for continuity between the fuel pump relay terminals

2 and 4.

•

There should be continuity (approximately 70

Ω

)

(3) Use jumper wires to connect fuel pump relay terminal 4 to

the positive battery terminal and terminal 2 to the negative
battery terminal.

(4) Check the continuity between the fuel pump relay terminals

1 and 3 while connecting and disconnecting the jumper
wire at the negative battery terminal.

•

Should be less than 2 ohm. (Negative battery terminal
connected)

•

Should be open loop. (Negative battery terminal
disconnected)

(5) Install the fuel pump relay.

Q: Is the resistance normal?

YES : Go to Step 7.
NO : Replace the fuel pump relay. Then confirm that the

malfunction symptom is eliminated

AK000360AB

CONNECTOR : A-20X

AK000369AC

FUEL PUMP RELAY
SIDE CONNECTOR

1 2
3 4

AK000370AC

FUEL PUMP RELAY
SIDE CONNECTOR

1 2
3 4