Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 328

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-511

CIRCUIT OPERATION

•

The battery positive voltage is applied on the
ignition coil by the ignition switch-IG.

•

When the ECM <M/T> or PCM <A/T> turns the
power transistor in the ECM <M/T> or PCM <A/
T> "OFF", battery positive voltage is applied on
the ignition power transistor (terminals 3), and the
ignition power transistor turns "ON".

•

When the ignition power transistor turns on, the
ignition coil's primary circuit is grounded by the
ignition power transistor terminal 4. Then the
primary current flows to the ignition coil.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

•

Malfunction of the ignition coil.

•

Malfunction of the ignition power transistor.

•

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

•

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

AK000217AB

AK000217

CONNECTOR : B-22

AK000315

CONNECTOR:C-101

AC

AK000225

C-52

C-55

C-51

C-58

CONNECTORS:C-51,C-58<M/T>
C-52,C-55<A/T>

ECM<M/T>

PCM<A/T>

AH

AK000345AE

CONNECTOR:C-89

AK000219

CONNECTOR:C-87

AC

AK000312AJ

CONNECTOR:C-07

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-512

DIAGNOSIS

STEP 1. Check connector B-22 at distributor for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

STEP 2. Check the ignition coil.
Refer to GROUP 16, Ignition System

−

On-vehicle service

−

Ignition coil Check (

P.16-35

).

Q: Are there any abnormalities?

YES : Go to Step 3.
NO : Repair the ignition coil. Then confirm that the

malfunction symptom is eliminated.

STEP 3. Check the ignition power transistor.
Refer to GROUP 16, Ignition System

−

On-vehicle service

−

Power transistor Check (

P.16-35

).

Q: Are there any abnormalities?

YES : Go to Step 4.
NO : Repair the ignition power transistor. Then confirm that

the malfunction symptom is eliminated.

STEP 4. Check the power supply voltage at distributor
connector B-22.
(1) Disconnect the connector B-22 and measure at the harness

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 5.
NO : Check connector C-07, C-89 and C-101 at

intermediate connectors for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection (

P.00E-2

). If intermediate

connectors are in good condition, repair harness wire
between ignition switch connector C-87 terminal 2
and distributor connector B-22 terminal 1because of
open circuit. Then confirm that the malfunction
symptom is eliminated.

AK000217AB

AK000217

CONNECTOR : B-22

AK000387AB

1

2

3

4

5

6

7

B-22 HARNESS
SIDE CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-513

STEP 5. Check the continuity at distributor harness side
connector B-22.
(1) Disconnect the connector B-22 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 6.
NO : Repair harness wire between distributor connector B-

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

STEP 6. Check connector C-51, C-58 at ECM <M/T> or
connector C-52, C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

AK000388AB

1

2

3

4

5

6

7

B-22 HARNESS
SIDE CONNECTOR

AK000225

C-52

C-55

C-51

C-58

CONNECTORS:C-51,C-58<M/T>
C-52,C-55<A/T>

ECM<M/T>

PCM<A/T>

AH

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-514

STEP 7. Check for open circuit between distributor
connector B-22 terminal 3 and ECM connector C-51
terminal 11 <M/T> or PCM connector C-52 terminal 11 <A/
T>.
Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 8. Check for open circuit between distributor
connector B-22 terminal 2 and ECM connector C-58
terminal 45 <M/T> or PCM connector C-55 terminal 43 <A/
T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK000217AB

AK000217

CONNECTOR : B-22

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

AK000217AB

AK000217

CONNECTOR : B-22

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AI