Mitsubishi Galant. Manual — part 238

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-177

STEP 4. Check connector B-29 at left bank heated oxygen
sensor (rear) and connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 15.

STEP 5. Using scan tool MB991502, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).

•

Warming up the engine. When the engine is revved, the
output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.

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

Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points(

P.00-8

).

NO : Replace the PCM. Then go to Step 15.

AK000619 AC

CONNECTOR:B-29

AK000280

CONNECTOR : C-41

PCM

AY

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-178

STEP 6. Check connector B-29 at left bank heated oxygen
sensor (rear) and connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between left bank heated oxygen

sensor (rear) connector B-29 terminal 4 and PCM
connector C-41 terminal 73 because of open circuit or
harness damage. Then go to Step 15.

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

Connector Inspection(

P.00E-2

). Then go to Step 15.

STEP 7. Check connector B-29 at left bank heated oxygen
sensor (rear) for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 15.

STEP 8. Check the continuity at left bank heated oxygen
sensor (rear) harness side connector B-29.
(1) Disconnect the connector B-29 and measure at the harness

side.

(2) Check for the continuity between terminal 2 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 11.
NO : Go to Step 9.

AK000619 AC

CONNECTOR:B-29

AK000280

CONNECTOR : C-41

PCM

AY

AK000619 AC

CONNECTOR:B-29

AK000243

B-29 HARNESS
SIDE CONNECTOR

2

4

1

3

AG

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-179

STEP 9. Check connector C-40 at PCM 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 15.

STEP 10. Check for open circuit and harness damage
between left bank heated oxygen sensor (rear) connector
B-29 terminal 2 and PCM connector C-40 terminal 57.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 15.
NO : Repair it. Then go to Step 15.

STEP 11. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 15.

AK000280

CONNECTOR : C-40

PCM

AV

AK000619 AC

CONNECTOR:B-29

AK000280

CONNECTOR : C-40

PCM

AV

AK000280

CONNECTOR : C-41

PCM

AY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-180

STEP 12. Check for harness damage between left bank
heated oxygen sensor (rear) connector B-29 terminal 2 and
PCM connector C-40 terminal 57.
Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then go to Step 15.

STEP 13. Check for short circuit to ground and harness
damage between left bank heated oxygen sensor (rear)
connector B-29 terminal 4 and PCM connector C-41
terminal 73.
Q: Is the harness wire in good condition?

YES : Go to Step 14.
NO : Repair it. Then go to Step 15.

AK000619 AC

CONNECTOR:B-29

AK000280

CONNECTOR : C-40

PCM

AV

AK000619 AC

CONNECTOR:B-29

AK000280

CONNECTOR : C-41

PCM

AY