Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 256

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-223

STEP 5. Check the injector.
(1) Disconnect the injector connector B-01 <No.1 cylinder> or

B-05 <No.3 cylinder> or B-26 <No.5 cylinder>.

(2) Measure the resistance between injector side connector

terminal 1 and 2.

Standard value: 13

−

16 ohm [at 20

°

C (68

°

F)]

Q: Is the resistance standard value?

YES : Repair harness wire between injector intermediate

connector and injector connector because of open
circuit or short circuit to ground or harness damage.

a. Repair harness wire between injector

intermediate connector B-48 terminal 1 and
injector connector B-01 terminal 1 and harness
wire between injector connector B-01 terminal
2 and injector intermediate connector B-48
terminal 2 when checking No.1 cylinder.

b. Repair harness wire between injector

intermediate connector B-48 terminal 1 and
injector connector B-05 terminal 1 and harness
wire between injector connector B-05 terminal
2 and injector intermediate connector B-48
terminal 3 when checking No.3 cylinder.

c. Repair harness wire between injector

intermediate connector B-48 terminal 1 and
injector connector B-26 terminal 1 and harness
wire between injector connector B-26 terminal
2 and injector intermediate connector B-48
terminal 4 when checking No.5 cylinder.

Then go to Step 12.

NO : Replace the injector. Then go to Step 12.

STEP 6. Check the power supply voltage at injector
intermediate connector B-48.
(1) Disconnect the connector B-48 and measure at the female

connector 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 8.
NO : Go to Step 7.

AK000210AB

B-05 B-26

B-01

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

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

AK000271AB

2 1

4 3

INJECTOR
NTERMEDATE
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-224

STEP 7. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector A-

21X terminal 1 and injector intermediate connector B-
48 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.

STEP 8. Check for harness damage between MFI relay
connector A-21X terminal 1 and injector intermediate
connector B-48 terminal 1.
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO : Repair it. Then go to Step 12.

STEP 9. Check connector C-51 at ECM <M/T> or connector
C-52 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000209AC

CONNECTOR:B-48

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-225

STEP 10. Check for open circuit and short circuit to
ground and harness damage between injector
intermediate connector and ECM connector <M/T> or PCM
connector <A/T>.

a. Check the harness wire between intermediate connector B-

48 terminal 2 and ECM connector C-51 terminal 1 <M/T> or
PCM connector C-52 terminal 1 <A/T> when checking No.1
cylinder.

b. Check the harness wire between intermediate connector B-

48 terminal 3 and ECM connector C-51 terminal 24 <M/T>
or PCM connector C-52 terminal 24 <A/T> when checking
No.3 cylinder.

c. Check the harness wire between intermediate connector B-

48 terminal 4 and ECM connector C-51 terminal 10 <M/T>
or PCM connector C-52 terminal 10 <A/T> when checking
No.5 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 12.

AK000209AC

CONNECTOR:B-48

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-226

STEP 11. Using the oscilloscope, check the injector.
(1) Disconnect the injector intermediate connector B-48 and

connect the test harness special tool (MD998464) in
between.

(2) Connect the oscilloscope probe to each injector

intermediate connector terminal to oscilloscope each
cylinder:

•

Terminal 2 (black clip) when checking No.1 cylinder.

•

Terminal 3 (blue clip) when checking No.3 cylinder.

•

Terminal 4 (white clip) when checking No.5 cylinder.

NOTE: When measuring with the ECM or PCM side
connector, connect an oscilloscope probe to the each of the
following terminals.

.

•

ECM or PCM terminal 1 when checking No.1 cylinder
injector

•

ECM or PCM terminal 24 when checking No.3 cylinder
injector

•

ECM or PCM terminal 10 when checking No.5 cylinder
injector

(3) Start the engine and run at idle.
(4) Measure the waveform.

•

The waveform should show a normal pattern similar to
the illustration.

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

Q: Is the waveform normal?

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 : Replace the ECM or PCM. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor (

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0201, P0203, P0205 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AK000063

1 2

3 4

OSCILLOSCOPE

INJECTOR INTERMEDIATE
CONNECTOR

OSCILLO

SCOPE

PROBE

AB

AKX01557 AB

A

NORMAL WAVEFORM

A:INJECTOR DRIVE TIME