Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 151

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-303

STEP 6. 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 idle air control motor connector B-
34 terminal 2, 5 because of open circuit or short circuit
to ground. Then go to Step 14.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

STEP 7. Check the power supply voltage at ECM connector
C-49 <M/T> or PCM connector C-50 <A/T> by backprobing
(1) Do not disconnect the connector C-49 <M/T> or C-50 <A/

T>.

(2) Measure the voltage between terminal (4, 5, 17, 18) <M/T>

or (14, 15, 28, 29) <A/T> and ground by backprobing.

•

The voltage is 1V or lower for approximately 3 seconds,
then changes to the battery positive voltage when the
Ignition switch is turned from the "LOCK" (OFF) position
to the "ON" position.

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

Q: Is the voltage normal?

YES : Go to Step 10.
NO : Go to Step 8.

STEP 8. Check connector C-49 at ECM <M/T> or connector
C-50 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000306

10

1 2 3 4 5 6 7 8 9

1112 13

141516171819 20 2122 23242526

AC

<M/T>

C-49 CONNECTOR
HARNESS SIDE VIEW

AK000307

1

2

3 4

5 6

7 8

9 10 11 1213 141516 17 1819 20 21 2223

24 25

2627 2829

30 3132 33

3435

AD

C-50 CONNECTOR
HARNESS SIDE VIEW

<A/T>

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-304

STEP 9. Check for open circuit and short circuit to ground
between idle air control motor connector B-34 and ECM
connector C-49 <M/T> or PCM connector C-50 <A/T>.

a. Idle air control motor connector B-34 terminal 1 and ECM

connector C-49 terminal 4 <M/T> or PCM connector C-50
terminal 14 <A/T>.

b. Idle air control motor connector B-34 terminal 3 and ECM

connector C-49 terminal 17 <M/T> or PCM connector C-50
terminal 28 <A/T>.

c. Idle air control motor connector B-34 terminal 4 and ECM

connector C-49 terminal 5 <M/T> or PCM connector C-50
terminal 15 <A/T>.

d. Idle air control motor connector B-34 terminal 6 and ECM

connector C-49 terminal 18 <M/T> or PCM connector C-50
terminal 29 <A/T>.

Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.

STEP 10. Check connector C-49 at ECM <M/T> or
connector C-50 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

ACX02519 AI

IDLE AIR
CONTROL MOTOR

CONNECTOR:B-34

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-305

STEP 11. Check the idle air control motor operation using
special tool MB991709.
(1) Remove the idle air control motor.
(2) Connect special tool MB991709 to the idle air control motor.

(All terminals should be connected.)

(3) Use the jumper wires to connect terminal 2 of the idle air

control motor connector to the battery (+) terminal.

(4) Check the ensure that the motor operates when the

terminals 1 and 3 of the idle air control motor connector are
respectively connected to the battery (-) terminal using a
jumper wire.

•

Vibration should be present at each application of
voltage to test clip combination.

(5) Then. Use jumper wires to connect the terminal 5 of the idle

air control motor connector to the battery (+) terminal.

(6) Check the ensure that the motor operates when the

terminals 4 and 6 of the idle air control motor connector are
respectively connected to the battery (-) terminal using a
jumper wire.

•

Vibration should be present at each application of
voltage to test clip combination.

(7) Install the idle air control motor. Refer to, Throttle Body

−

Disassembly and Assembly (

P.13A-489

).

Q: Is the idle air control motor operating properly?

YES : Go to Step 12.
NO : Replace the idle air control motor. Then go to Step 14.

ACX02519 AI

IDLE AIR
CONTROL MOTOR

CONNECTOR:B-34

AKX01626

AKX01627AB

TERMINAL 2

IAC MOTOR

TERMINAL 5

MB991709

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-306

STEP 12. Check for harness damage between MFI relay
connector A-21X terminal 1 and idle air control motor
connector B-34 terminal 2, 5.
Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then go to Step 14.

STEP 13. Check for harness damage between idle air
control motor connector B-34 and ECM connector C-49
<M/T> or PCM connector C-50 <A/T>.

a. Idle air control motor connector B-34 terminal 1 and ECM

connector C-49 terminal 4 <M/T> or PCM connector C-50
terminal 14 <A/T>.

b. Idle air control motor connector B-34 terminal 3 and ECM

connector C-49 terminal 17 <M/T> or PCM connector C-50
terminal 28 <A/T>.

c. Idle air control motor connector B-34 terminal 4 and ECM

connector C-49 terminal 5 <M/T> or PCM connector C-50
terminal 15 <A/T>.

d. Idle air control motor connector B-34 terminal 6 and ECM

connector C-49 terminal 18 <M/T> or PCM connector C-50
terminal 29 <A/T>.

Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

ACX02519 AI

IDLE AIR
CONTROL MOTOR

CONNECTOR:B-34

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC