Mitsubishi Outlander XL. Manual — part 250

DIAGNOSIS

STEP 1. Check the cooling system.
Refer to GROUP14, Engine Cooling Diagnosis P.14-3.

Q:Is the cooling system normal?

YES:

Go to Step 2.

NO:

Repair it. Then Go to Step 2.

STEP 2. Test the OBD-II drive cycle.

(1)

Carry out test drive with the drive cycle pattern. Refer to
Diagnostic Function - OBD-II Drive Cycle - Pattern 10 P.
13Ab-8.

(2)

Check the diagnostic trouble code (DTC).

Q:Is DTC P0128 set?

YES:

Replace the ECM. When the ECM is replaced, register

the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8.

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.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-195

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC P0131: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 1)

M11310100186USA0000010000

ZK602838

1

2

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

2

1

4

3

0.5 V

AA00

ENGINE
CONTROL
MODULE

RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)

FROM MFI RELAY

TO ECM

1

2

3

4

55

BLA

CK-WHITE

VIOLET

54

RIGHT BANK HEATED OXYGEN SENSOR (FRONT) CIRCUIT

B-10

B-03

MU802665

13Ab-196

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

ZK603590AA00

Right bank heated
oxygen sensor (front)

Front exhaust
pipe RH

B-03 (GR)

Connector: B-03

ZK603591

ECM

B-10 (GR)

Connector: B-10

AA00

CIRCUIT OPERATION

｠

A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the ECM
(terminal No. 54) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(front).

｠

Terminal No. 2 of the right bank heated oxygen
sensor (front) is grounded with ECM (terminal No.
55).

｠

The ECM applies an offset voltage of 0.5 volt to
terminal No. 2 of the right bank heated oxygen
sensor (front).

TECHNICAL DESCRIPTION

｠

The right bank heated oxygen sensor (front) detects
the concentration of oxygen in the exhaust gas; it

converts those data to voltage, and inputs the
resulting signals to the ECM.

｠

When the right bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response becomes poor.

｠

The ECM also checks for an open circuit in the right
bank heated oxygen sensor (front) output voltage.

DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output
voltage is under specified range.

MONITOR EXECUTION

Continuous

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-197

DIAGNOSTIC TROUBLE CODE PROCEDURES

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored in
memory for the item monitored below)

｠

Heated oxygen sensor heater (front) monitor

Sensor (The sensor below is determined to be
normal)

｠

Engine coolant temperature sensor

｠

Intake air temperature sensor

DTC SET CONDITIONS

Logic Flow Chart

End

Malfunction

Yes

Yes

Yes

No

No

No

2secs have passed?

Output voltage

< 0.2V

Monitoring

conditions

Good

Start

ZK603708 AA00

Check Conditions

｠

Heated oxygen sensor offset voltage is between 0.4
and 0.6 volt.

｠

Battery positive voltage is between 11 and 16.5
volts.

｠

Typically 60 seconds have passed since the engine
starting sequence was completed.

Judgement Criterion

｠

Right bank heated oxygen sensor (front) output
voltage is lower than 0.2 volt.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 23 P.13Ab-8.

13Ab-198

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES