Mitsubishi Outlander XL. Manual — part 253

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 off set voltage of 0.5 volt to
terminal No. 2 of the right bank 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 the right bank heated
oxygen sensor (front) rich learn switching
frequency.

DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) rich/lean
switching frequency is under specified value.

MONITOR EXECUTION

Continuous

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-207

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

DTC SET CONDITIONS

Logic Flow Chart

Start

Monitoring

conditions

Specified times monitored?

Malfunction

Good

End

No

No

No

No

Yes

Yes

Yes

Yes

Ff > F1

Calculate switching frequency of

front oxygen sensor output signal (Ff)

ZK603714 AA00

Calculate average switching

frequency (Ff) over specified times

Ff < F0

Check Conditions

｠

Engine coolant temperature is higher than 50°C
(122°F).

｠

Engine speed is between 1,250 and 3,500 r/min.

｠

Volumetric efficiency is between 25 and 65 percent.

｠

Under the closed loop air/fuel control.

｠

The accelerator pedal is open.

13Ab-208

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

｠

Short-term fuel trim is between -25 and +25 percent.

｠

More than 2 seconds have elapsed after the
abovementioned conditions have been met.

｠

The ECM monitors for this condition for 5 cycles of
12 seconds each during the drive cycle.

Judgement Criterion

｠

The average of the right bank heated oxygen
sensor (front) rich/lean switching frequency is less
than 13 times per 12 seconds.

NOTE:

If the sensor switching frequency is lower

than the Judgment Criteria due to the M.U.T.-III
OBD-II test Mode - HO2S Test Results, it is
assumed that the heated oxygen sensor has
deteriorated. If it is higher, it is assumed that
the harness is damaged or has a short circuit.If

the heated oxygen sensor signal voltage has not
changed even once (lean/rich) after the DTC was
erased, the sensor switch time will display as 0
second.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 1 P.13Ab-8.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )

｠

Right bank heated oxygen sensor (front)
deteriorated.

｠

ECM failed.

DIAGNOSIS

Required Special Tools:

｠

MB991316: Test Harness

STEP 1. 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 4,500 r/min.

ZK604077

Heated
oxygen
sensor
component
side
connector

MB991316

Black

White

AA00

(4)

Connect a digital voltage meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).

(5)

Warn up the engine, 2,500 r/min.

｠

Output voltage repeats 0 - 0.4 volt or less and 0.6 - 1.0 volts
13 times or more within 12 seconds.

｠

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 sufficiently high temperature [of

approximate 400°C (752°F) or more] is not reached
although the heated oxygen sensor is normal, the output
voltage would be possibly low although 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 positive terminal and the negative

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-209

DIAGNOSTIC TROUBLE CODE PROCEDURES

terminal of 8 volts power supply respectively, then
check again.

Q:Is the sensor operating properly?

YES:

Go to Step 2.

NO:

Replace the right bank heated oxygen sensor (front).

Then go to Step 2.

STEP 2. 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 1 P.
13Ab-8.

(2)

Check the diagnostic trouble code (DTC).

Q:Is DTC P0133 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.

DTC P0134: Heated Oxygen Sensor Circuit No Activity Detected (bank 1, sensor 1)

M11310100189USA0000010000

Heated Oxygen Sensor Circuit No Activity
Detected (bank 1, sensor 1) Circuit

｠

Refer to, DTC P0131 - Right Bank Heated Oxygen
Sensor (Front) Circuit Low Voltage P.13Ab-196.

｠

Refer to, DTC P0201 P.13Ab-332, P0203 P.
13Ab-347, P0205 P.13Ab-362- Injector Circuit.

CIRCUIT OPERATION

｠

Refer to, DTC P0131 P.13Ab-196- Right Bank
Heated Oxygen Sensor (Front) Circuit Low Voltage.

｠

Refer to, DTC P0201 P.13Ab-332, P0203 P.
13Ab-347, P0205 P.13Ab-362- Injector Circuit.

TECHNICAL DESCRIPTION

｠

The ECM effects air/fuel ratio feedback control in
accordance with the signals from the right bank
heater oxygen sensor (front).

｠

If the right bank heated oxygen sensor (front) has
deteriorated, corrections will be made by the right
bank heated oxygen sensor (rear).

｠

DTC P0134 becomes stored in memory if a failure
is detected in the above air/fuel ratio feedback
control system.

DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output
voltage does not exceed lean/rich criteria (about 0.5
volt) within specified period.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

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

｠

Misfire monitor

Sensor (The sensor below is determined to be
normal)

｠

Mass airflow sensor

｠

Engine coolant temperature sensor

｠

Intake air temperature sensor

｠

Barometric pressure sensor

｠

Throttle position sensor

｠

Accelerator pedal position sensor

13Ab-210

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES