Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 291

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-363

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-51 <M/T> or PCM connector C-52 <A/T> by backprobing
(1) Do not disconnect the connector C-51 <M/T> or C-52 <A/

T>.

(2) Measure the voltage between terminal 14, 15, 28, 29 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-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 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

AKX01550

3 4

5 6

7 8

10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

C-51<M/T>, C-52<A/T>
CONNECTOR HARNESS
SIDE VIEW

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-364

STEP 9. Check for open circuit and short circuit to ground
between idle air control motor connector B-34 and ECM
connector C-51 <M/T> or PCM connector C-52 <A/T>.

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

connector C-51 terminal 14 <M/T> or PCM connector C-52
terminal 14 <A/T>.

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

connector C-51 terminal 28 <M/T> or PCM connector C-52
terminal 28 <A/T>.

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

connector C-51 terminal 15 <M/T> or PCM connector C-52
terminal 15 <A/T>.

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

connector C-51 terminal 29 <M/T> or PCM connector C-52
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-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 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 14.

ACX02523AI

IDLE AIR
CONTROL
MOTOR

CONNECTOR:B-34

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-365

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.13B-565

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.

ACX02523AI

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) <3.0L ENGINE>

13B-366

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-51
<M/T> or PCM connector C-52 <A/T>.

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

connector C-51 terminal 14 <M/T> or PCM connector C-52
terminal 14 <A/T>.

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

connector C-51 terminal 28 <M/T> or PCM connector C-52
terminal 28 <A/T>.

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

connector C-51 terminal 15 <M/T> or PCM connector C-52
terminal 15 <A/T>.

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

connector C-51 terminal 29 <M/T> or PCM connector C-52
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

ACX02523AI

IDLE AIR
CONTROL
MOTOR

CONNECTOR:B-34

ACX02523AI

IDLE AIR
CONTROL
MOTOR

CONNECTOR:B-34

AK000225

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

C-52

C-51

PCM<A/T>

ECM<M/T>

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