Mitsubishi Galant. Manual — part 228

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-137

STEP 8. Check the continuity at right bank heated oxygen
sensor (rear) harness side connector B-31.
(1) Disconnect the connector B-31 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.

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 right bank heated oxygen sensor (rear) connector
B-31 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.

AK000243AF

2
4

1
3

B-31 HARNESS
SIDE CONNECTOR

AK000280

CONNECTOR : C-40

PCM

AV

AK000617

CONNECTOR:B-31

AC

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-138

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.

STEP 12. Check for harness damage between right bank
heated oxygen sensor (rear) connector B-31 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.

AK000280

CONNECTOR : C-41

PCM

AY

AK000617

CONNECTOR:B-31

AC

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-139

STEP 13. Check for short circuit to ground and harness
damage between right bank heated oxygen sensor (rear)
connector B-31 terminal 4 and PCM connector C-41
terminal 74.
Q: Is the harness wire in good condition?

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

STEP 14. Check the right bank heated oxygen sensor
(rear).
(1) Disconnect the right bank heated oxygen sensor (rear)

connector B-31 and connect test harness special tool,
MB991316, to the connector on the right bank heated
oxygen sensor (front) side.

(2) Warm up the engine until engine coolant 80

°

C (176

°

F) or

higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the right bank heated
oxygen sensor (rear).
(3) Use the jumper wires to connect terminal 1 (red clip) to the

positive battery terminal and terminal 3 (blue clip) to the
negative battery terminal.

(4) Connect a digital volt meter between terminal 2 (black clip)

and terminal 4 (white clip).

(5) While repeatedly revving the engine, measure the right

bank heated oxygen sensor (rear) output voltage.

Standard value: 0.6

−−−−

1.0 V

Q: Is the voltage at the standard value?

YES : Replace the PCM. Then go to Step 15.
NO : Replace the right bank heated oxygen sensor (rear).

Then go to Step 15.

AK000617

CONNECTOR:B-31

AC

AK000280

CONNECTOR : C-41

PCM

AY

ACX02493AG

CONNECTOR:B-31

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-140

STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Procedure 4

−

Heated oxygen Sensor Monitor and

Procedure 6

−

Other Monitor (

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0136 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.