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Mitsubishi Outlander GS45X. Manual - part 835

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-273

DTC P0153: Heated Oxygen Sensor Circuit Slow Response (bank 2, sensor 1)

AK700140

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

RED

SKY BLUE

B-10

B-14

MU802605

FROM MFI RELAY

0.5 V

ENGINE
CONTROL
MODULE

TO ECM

LEFT BANK HEATED OXYGEN SENSOR (FRONT) CIRCUIT

LEFT BANK HEATED
OXYGEN SENSOR (FRONT)

AK700404

Left bank heated oxygen
sensor (front)

Connector: B-14

B-14 (B)

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-274

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 38) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(front).

• Terminal No. 2 of the left bank heated oxygen

sensor (front) is grounded with ECM (terminal
No. 39).

• The ECM applies an offset voltage of 0.5 volt to

terminal No. 2 of the left bank heated oxygen
sensor (front).

TECHNICAL DESCRIPTION

• The left 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 left bank heated oxygen sensor (front)

begins to deteriorate, the left bank heated oxygen
sensor signal response becomes poor.

• The ECM also checks for the left bank heated

oxygen sensor (front) rich/lean switch frequency.

DESCRIPTIONS OF MONITOR METHODS

Left bank heated oxygen sensor (front) output volt-

age is over specified range.

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)

• Heated oxygen sensor (front) heater monitor

• Misfire monitor

• Fuel system 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-275

DTC SET CONDITION

Logic Flow Chart

Check Conditions

• Engine coolant temperature is higher than 60°C

(140

°F).

• Engine speed is between 1,188 and 3,000 r/min.

• Volumetric efficiency is between 21 and 69 per-

cent.

• Under the closed loop air/fuel control.

• The accelerator pedal depressed.

• Short-term fuel trim is at between −25 and +25

percent.

• More than 2 seconds have elapsed after the

above mentioned conditions have been met.

• During the drive cycle, the ECM performs moni-

toring with the accumulated total time of 12 sec-
onds, 5 times.

Judgement Criteria

• The average of the left bank heated oxygen sen-

sor (front) rich/lean switching frequency is less
than 11 times <Except for California> or 12 times
<California> for the accumulated total time of 12
seconds.

• The left bank heated oxygen sensor (front)

rich/lean switching frequency is less than 20
times for the accumulated total time of 12 sec-
onds.

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 deterio-
rated. 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 sec-
onds.

F0: Threshold value for average switching frequency

Start

Monitoring

conditions

Malfunction

Good

End

Yes

Ff < F0

Calculate average switching

frequency (Ff) over specified times

AK604323

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-276

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 1

P.13B-11

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

• Left bank heated oxygen sensor (front) deterio-

rated.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MD998464: Test Harness

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

connector B-14 and connect test harness special tool,
MD998464, to the connector on the left 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.

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

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

(5) Warm up 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.

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 sensor operating properly?

YES : Go to Step 2.
NO : Replace the left bank heated oxygen sensor (front).

Then go to Step 2.

AK700554AB

Heated
oxygen
sensor
component
side
connector

MD998464

Black

White

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