Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 112

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-147

STEP 1. Check connector B-23 at the heated oxygen
sensor (rear) 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 go to Step 12.

STEP 2. Check the heated oxygen sensor (rear).
(1) Disconnect heated oxygen sensor (rear) connector C-23

and connect test harness special tool, MB991658, to the
connector on the heated oxygen (rear) sensor side.

(2) Measure the resistance between heated oxygen sensor

connector terminal 5 and terminal 6.

Standard value: 11

−

18 ohm [at 20

°

C (68

°

F)]

Q: Is the resistance normal?

YES : Go to Step 3.
NO : Replace the heated oxygen sensor (rear). Then go to

Step 12.

STEP 3. Check the power supply voltage at heated oxygen
sensor (rear) harness side connector C-23.
(1) Disconnect the connector C-23 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5 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 : Go to Step 4.

AK000733AB

CONNECTOR:C-23

ACX02495

HEATED OXYGEN
SENSOR (REAR)

AE

CONNECTOR:C-23

AK000121AB

HEATED OXYGEN SENSOR
EQUIPMENT SIDE CONNECTOR

MB991658

AK000322

1

2

3

4

5

6

C-23 HARNESS
SIDE CONNECTOR

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-148

STEP 4. Check harness connector A-21X at the MFI relay
for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector A-

21X terminal 1 and heated oxygen sensor (rear)
connector C-23 terminal 5 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 5. Check the power supply voltage at ECM connector
C-56 <M/T> or PCM connector C-50 <A/T> by backprobing.
(1) Do not disconnect the connector C-56 <M/T> or C-50 <A/

T>.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 54 <M/T> or 26 <A/

T> and ground by backprobing.

•

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 6.

STEP 6. Check connector C-56 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 7.
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

AK000294

<M/T>

C-56 CONNECTOR
HARNESS SIDE VIEW

51 52 53 54 55 56

57 58 59 60 61 62

AC

AK000295

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-56

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

CONNECTORS:C-56<M/T>,C-50<A/T>

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-149

STEP 7. Check for open circuit or short circuit to ground
between heated oxygen sensor (rear) connector C-23
terminal 6 and ECM connector C-56 terminal 54 <M/T> or
PCM connector C-50 terminal 26 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

STEP 8. Check connector C-56 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 12.

AK000733AB

CONNECTOR:C-23

AK000280

C-49

C-56

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

CONNECTORS:C-56<M/T>,C-50<A/T>

BG

AK000280

C-49

C-56

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

CONNECTORS:C-56<M/T>,C-50<A/T>

BG

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-150

STEP 9. Check for harness damage between MFI relay
connector A-21X terminal 1 and heated oxygen sensor
(rear) connector C-23 terminal 5.
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO : Repair it. Then go to Step 12.

STEP 10. Check for harness damage between heated
oxygen sensor (rear) connector C-23 terminal 6 and ECM
connector C-56 terminal 54 <M/T> or PCM connector C-50
terminal 26 <A/T>.
Q: Is the harness wire in good condition?

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

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000733AB

CONNECTOR:C-23

AK000733AB

CONNECTOR:C-23

AK000280

C-49

C-56

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

CONNECTORS:C-56<M/T>,C-50<A/T>

BG