Mitsubishi Outlander GS45X. Manual - part 823

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-225

STEP 1. Check harness connector B-03 at the right bank
heated oxygen sensor (front) harness connector B-10 at
the ECM for damage.
Q: Is the harness 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 5.

STEP 2. Check the right bank heated oxygen sensor
(front).
(1) Disconnect the right bank heated oxygen sensor (front)

connector B-03 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 temperature

reaches 80

°C (176°F) or higher.

(3) Rev the engine for 5 minutes or more with the engine speed

of 2,500 r/min.

(4) Connect a digital voltage meter between terminal No. 2

(black clip) and terminal No. 4 (white clip).

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

bank heated oxygen sensor (front) output voltage.

Standard value: 0.6

− 1.0 volts

CAUTION

• Be very careful when connecting the jumper wires;

incorrect connection can damage the heated oxygen
sensor.

• Be careful the heater can be damaged if a voltage

beyond 8 volts is applied to the heated oxygen sensor
heater.
NOTE: If the temperature of sensing area does not reach
the high temperature [of approximately 400

C (752

F) or

more] even though the oxygen sensor is normal, the output
voltage would be possibly low in spite of the rich air-fuel
ratio. Therefore, if the output voltage is low, use a jumper
wire to connect the terminal No.1 (red clip) and the terminal
No. 3 (blue clip) of the heated oxygen sensor with the posi-
tive terminal and the negative terminal of 8 volts power sup-
ply respectively, then check again.

Q: Is the voltage between 0.6 and 1.0 volts?

YES : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (front).

Then go to Step 5.

AK700551

Heated
oxygen
sensor
component
side
connector

MB991316

Black

White

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-226

STEP 3. Check for harness between the right heated
oxygen sensor (front) connector B-03 and the ECM
connector B-10.
(1) Disconnect the right bank heated oxygen sensor (front)

connector B-03 and the ECM connector B-10.

(2) Measure the resistance between the heated oxygen sensor

connector B-03 and the ECM connector B-10.

a. Connector B-03 (terminal No. 2) and connector B-10

(terminal No. 55).

b. Connector B-03 (terminal No. 4) and connector B-10

(terminal No. 54).

• Should be less than 2 ohms.

(3) Check for the continuity between the oxygen sensor

connector B-03 and ground.

a. Connector B-03 (terminal No. 2) and ground.
b. Connector B-03 (terminal No. 4) and ground.

• Not continuity.

Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it. Refer to GROUP 00E, Harness Connector

Inspection

P.00E-2

. Then go to Step 5.

AK700266

16 15 14 13 12 11 10 9 8 7 6 5 4 3

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

B-03 harness
connector:
component side

B-10 harness
connector:
component side

AK700267 AB

B-03 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-227

STEP 4. Using scan tool MB991958, check data list item
AC: Heated Oxygen Sensor Bank 1, Sensor 1 (right front).

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

AC, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).

• Warm up the engine. When the engine is revved, the

output voltage should battery positive voltage.

• Warm up the engine. When the engine is idling, the out-

put voltage should repeat 0.4 volt or less 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

− How to

Cope with Intermittent Malfunctions

P.00-15

NO : Replace the ECM. Then go to Step 5.

STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 21

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0131 set?

YES : Retry the troubleshooting.
NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points How to
Cope with Intermittent Malfunctions

P.00-15

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-228

DTC P0132: Heated Oxygen Sensor Circuit High Voltage (bank 1, sensor 1)

AK700138

3 4 5 6 7 8 9 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 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

FROM MFI RELAY

BLA

CK-WHITE

VIOLET

B-10

B-03

MU802665

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

RIGHT BANK HEATED OXYGEN SENSOR (FRONT) CIRCUIT

RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)

AK900129 AD

Right bank heated
oxygen sensor (front)

Front exhaust
pipe RH

B-03 (GR)

Connector: B-03

AK700401AB

ECM

B-10 (GR)

Connector: B-10

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