Juke F15 (2012 year). Service Repair Manual - part 125

P0131 A/F SENSOR 1

EC-209

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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P0131 A/F SENSOR 1

DTC Logic

INFOID:0000000006546991

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately low.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.

2.

CHECK A/F SENSOR FUNCTION

With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Select “A/F SEN1 (B1)” in “DATA MONITOR” mode of “ENGINE” using CONSULT-III.

3.

Check “A/F SEN1 (B1)” indication.

With GST

Follow the procedure “With CONSULT-III” above.

Is the indication constantly approx. 0 V?

YES

>> Proceed to 

EC-210, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch OFF, wait at least 10 seconds and then restart engine.

2.

Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.

CAUTION:

Always drive vehicle at a safe speed.

3.

Maintain the following conditions for about 20 consecutive seconds.

NOTE:
• Keep the accelerator pedal as steady as possible during the cruising.
• If this procedure is not completed within 1 minute after restarting engine at step 1, return to step

1.

4.

Check 1st trip DTC.

With GST

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible Cause

P0131

A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1 
circuit low voltage]

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 0 V.

• Harness or connectors

(A/F sensor 1 circuit is open or 
shorted.)

• A/F sensor 1

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 40 km/h (25 mph)

B/FUEL SCHDL

1.5 - 9.0 msec

Selector lever

Suitable position

EC-210

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0131 A/F SENSOR 1

Follow the procedure “With CONSULT-III” above.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-210, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006601127

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between A/F sensor 1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

4.

Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

+

−

Voltage

A/F sensor 1

Connector

Terminal

F70

4

Ground

Battery voltage

+

−

Continuity

A/F sensor 1

IPDM E/R

Connector

Terminal

Connector

Terminal

F70

4

E14

36

Existed

+

−

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F70

1

F25

21

Existed

2

25

P0131 A/F SENSOR 1

EC-211

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1. Refer to 

EM-38, "Exploded View"

.

CAUTION:

• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard

surface such as a concrete floor; use a new one.

• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner

[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).

>> INSPECTION END

+

−

Continuity

A/F sensor 1

Connector

Terminal

F70

1

Ground

Not existed

2

+

−

Continuity

ECM

Connector

Terminal

F25

21

Ground

Not existed

25

EC-212

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0132 A/F SENSOR 1

P0132 A/F SENSOR 1

DTC Logic

INFOID:0000000006546994

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately high.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

>> GO TO 2.

2.

CHECK A/F SENSOR FUNCTION

With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Select “A/F SEN1 (B1)” in “DATA MONITOR” mode of “ENGINE” using CONSULT-III.

3.

Check “A/F SEN1 (B1)” indication.

With GST

Follow the procedure “With CONSULT-III” above.
Is the indication constantly approx. 5 V?

YES

>> Proceed to 

EC-213, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch OFF, wait at least 10 seconds and then restart engine.

2.

Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.

CAUTION:

Always drive vehicle at a safe speed.

3.

Maintain the following conditions for about 20 consecutive seconds.

NOTE:
• Keep the accelerator pedal as steady as possible during the cruising.
• If this procedure is not completed within 1 minute after restarting engine at step 1, return to step

1.

4.

Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT-III” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0132

A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1 
circuit high voltage]

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 5 V.

• Harness or connectors

(A/F sensor 1 circuit is open or short-
ed.)

• A/F sensor 1

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 40 km/h (25 mph)

B/FUEL SCHDL

1.5 - 9.0 msec

Selector lever

Suitable position

P0132 A/F SENSOR 1

EC-213

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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Is 1st trip DTC is detected?

YES

>> Proceed to 

EC-213, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006601130

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between A/F sensor 1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

4.

Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

+

−

Voltage

A/F sensor 1

Connector

Terminal

F70

4

Ground

Battery voltage

+

−

Continuity

A/F sensor 1

IPDM E/R

Connector

Terminal

Connector

Terminal

F70

4

E14

36

Existed

+

−

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F70

1

F25

21

Existed

2

25

+

−

Continuity

A/F sensor 1

Connector

Terminal

F70

1

Ground

Not existed

2

EC-214

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0132 A/F SENSOR 1

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1. Refer to 

EM-38, "Exploded View"

.

CAUTION:

• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard

surface such as a concrete floor; use a new one.

• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner

[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).

>> INSPECTION END

+

−

Continuity

ECM

Connector

Terminal

F25

21

Ground

Not existed

25

P0133 A/F SENSOR 1

EC-215

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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P0133 A/F SENSOR 1

DTC Logic

INFOID:0000000006598863

DTC DETECTION LOGIC

To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed
by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel
feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the com-
pensated time (the A/F signal cycling time index) is inordinately long or not.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no
load.

4.

Let engine idle for 1 minute.

5.

Select “ENGINE” using CONSULT-III.

6.

Select “A/F SEN1(B1) P1278/P1279” (for DTC P0133) of “A/F SEN1” in “DTC WORK SUPPORT” mode.

7.

Touch “START”.

Is “COMPLETED” displayed on CONSULT-III screen?

YES

>> GO TO 3

NO

>> GO TO 4.

3.

PERFORM DTC CONFIRMATION PROCEDURE-II

Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Proceed to 

EC-216, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE-II

1.

After perform the following procedure, “TESTING” will be displayed on the CONSULT-III screen.

-

Increase the engine speed up to between 4,000 and 5,000 rpm and maintain that speed for 10 seconds.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0133

A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1 
circuit slow response]

The response of the A/F signal computed by ECM 
from A/F sensor 1 signal takes more than the 
specified time.

• Harness or connectors

(A/F sensor 1 circuit is open or 
shorted.)

• A/F sensor 1
• A/F sensor 1 heater
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks
• PCV
• Mass air flow sensor

EC-216

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0133 A/F SENSOR 1

-

Fully release accelerator pedal and then let engine idle for about 10 seconds.

If “TESTING” is not displayed after 10 seconds, refer to 

EC-558, "Component Function Check"

.

2.

Wait for about 20 seconds at idle as per the condition that “TESTING” is displayed on the CONSULT-III
screen.

3.

Make sure that “TESTING” changes to “COMPLETED”.
If “TESTING” changed to “OUT OF CONDITION”, refer to 

EC-558, "Component Function Check"

. 

4.

Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Proceed to 

EC-216, "Diagnosis Procedure"

.

5.

CHECK AIR-FUEL RATIO SELF-LEARNING VALUE

With GST

1.

Start engine and warm it up to normal operating temperature.

2.

Select Service $01 with GST.

3.

Calculate the total value of “Short term fuel trim” and “Long term fuel trim” indications.

Is the total percentage within 

±

15%?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Intake air leaks
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Fuel injector
• Incorrect PCV hose connection
• PCV valve
• Mass air flow sensor

>> Repair or replace malfunctioning part.

7.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no
load.

3.

Let engine idle for 1 minute.

4.

Increase the engine speed up to between 4,000 and 5,000 rpm and maintain that speed for 10 seconds.

5.

Fully release accelerator pedal and then let engine idle for about 1 minute.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-216, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006598864

1.

RETIGHTEN A/F SENSOR 1

Loosen and retighten the A/F sensor 1. Refer to 

EM-166, "Exploded View"

.

>> GO TO 2.

2.

CHECK EXHAUST GAS LEAK

1.

Start engine and run it at idle.

P0133 A/F SENSOR 1

EC-217

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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2.

Listen for an exhaust gas leak before three way catalyst 1.

Is exhaust gas leak detected?

YES

>> Repair or replace.

NO

>> GO TO 3.

3.

CHECK FOR INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor.

Is intake air leak detected?

YES

>> Repair or replace.

NO

>> GO TO 4.

4.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1.

Clear the mixture ratio self-learning value. Refer to 

EC-546, "Work Procedure"

.

2.

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171 or P0172. Refer to 

EC-635, "DTC Logic"

 or 

EC-639,

"DTC Logic"

.

NO

>> GO TO 5.

5.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between A/F sensor 1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

PBIB1216E

+

−

Voltage

A/F sensor 1

Connector

Terminal

F70

4

Ground

Battery voltage

+

-

Continuity

A/F sensor 1

IPDM E/R

Connector

Terminal

Connector

Terminal

F70

4

E14

36

Existed

EC-218

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0133 A/F SENSOR 1

NO

>> Repair or replace error-detected parts.

7.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

4.

Check the continuity between A/F sensor 1 harness connector and ground or ECM harness connector
and ground.

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts.

8.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Check the air fuel ratio (a/f) sensor 1 heater. Refer to 

EC-578, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 12.

9.

CHECK MASS AIR FLOW SENSOR

Check the mass air flow sensor. Refer to 

EC-590, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10. 

NO

>> Replace mass air flow sensor. Refer to 

EM-26, "Exploded View"

.

10.

CHECK PCV VALVE

Check the PCV valve. Refer to 

EC-804, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair or replace PCV valve. Refer to 

EM-53, "Exploded View"

.

11.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

+

-

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F70

1

F25

21

Existed

2

25

+

−

Continuity

A/F sensor 1

Connector

Terminal

F70

1

Ground

Not existed

2

+

−

Continuity

ECM

Connector

Terminal

F25

21

Ground

Not existed

25

P0133 A/F SENSOR 1

EC-219

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

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YES

>> GO TO 12.

NO

>> Repair or replace error-detected parts.

12.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to 

EM-38, "Exploded View"

.

CAUTION:

• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a

hard surface such as a concrete floor; use a new one.

• Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner (commercial service tool) and approved anti-seize lubricant (commercial service tool).

>> INSPECTION END

EC-220

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0137 HO2S2

P0137 HO2S2

DTC Logic

INFOID:0000000006546997

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during the various driving condition such as fuel-
cut.

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

°

C (32 to 86

°

F).

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

6.

Make sure that “COOLAN TEMP/S” indicates more than 70

°

C (158

°

F).

If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70

°

C (158

°

F).

7.

Open engine hood.

SEF259VA

DTC No.

Trouble diagnosis name

(Trouble diagnosis con-

tent)

DTC detecting condition

Possible cause

P0137

HO2S2 (B1)
(Heated oxygen sensor 
2 circuit low voltage)

The maximum voltage from the heated oxygen 
sensor 2 is not reached to the specified voltage.

• Harness or connectors

(Heated oxygen sensor 2 circuit is open 
or shorted)

• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leaks

P0137 HO2S2

EC-221

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

C

D

E

F

G

H

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K

L

M

A

EC

N

P

O

8.

Select “HO2S2 (B1) P1147” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT-
III.

9.

Follow the instruction of CONSULT-III.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.

10. Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Proceed to 

EC-222, "Diagnosis Procedure"

.

CAN NOT BE DIAGNOSED>>GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

1.

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

2.

Perform DTC CONFIRMATION PROCEDURE again.

>> GO TO 3.

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-221, "Component Function Check"

.

NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-222, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000006546998

1.

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

5.

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

ECM

Condition

Voltage

Connector

+

−

Terminal

F25

29

33

Revving up to 4,000 rpm under no 
load at least 10 times

The voltage should be above 0.68 V 
at least once during this procedure.

ECM

Condition

Voltage

Connector

+

−

Terminal

F25

29

33

Keeping engine speed at idle for 10 
minutes

The voltage should be above 0.68 V 
at least once during this procedure.

EC-222

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0137 HO2S2

NO

>> GO TO 3.

3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-222, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006546999

1.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1.

Clear the mixture ratio self-learning value. Refer to 

EC-139, "Work Procedure"

.

2.

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171. Refer to 

EC-239, "DTC Logic"

.

NO

>> GO TO 2.

2.

CHECK HO2S2 GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between HO2S2 harness connector and ECM harness connector.

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK HO2S2 INPUT SIGNAL CIRCUIT

1.

Check the continuity between HO2S2 harness connector and ECM harness connector.

2.

Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.

ECM

Condition

Voltage

Connector

+

−

Terminal

F25

29

33

Coasting from 80 km/h (50 MPH) in 
D position (CVT), 4th gear position 
(M/T)

The voltage should be above 0.68 V 
at least once during this procedure.

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F69

1

F25

33

Existed

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F69

4

F25

29

Existed

P0137 HO2S2

EC-223

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

C

D

E

F

G

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EC

N

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3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK HEATED OXYGEN SENSOR 2

Check the heated oxygen sensor 2. Refer to 

EC-223, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> GO TO 5.

5.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

CAUTION:

• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard

surface such as a concrete floor; use a new one.

• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner

[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).

>> INSPECTION END

Component Inspection

INFOID:0000000006547000

1.

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT-III

1.

Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

6.

Select “FUEL INJECTION” in “ACTIVE TEST” mode of “ENGINE” using CONSULT-III, and select “HO2S2
(B1)” as the monitor item with CONSULT-III.

+

−

Continuity

HO2S2

Connector

Terminal

F69

4

Ground

Not existed

+

−

Continuity

ECM

Connector

Terminal

F25

29

Ground

Not existed

EC-224

< DTC/CIRCUIT DIAGNOSIS >

[MR16DDT ]

P0137 HO2S2

7.

Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to 

±

 25%.

“HO2S2 (B1)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)” should be below 0.18 V at least once when the “FUEL INJECTION” is 

−

 25%.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 6.

3.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

5.

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 5.

5.

CHECK HEATED OXYGEN SENSOR 2-III

Check the voltage between ECM harness connector and ground as per the following condition.

PBIB3458E

ECM

Condition

Voltage

Connector

+

−

Terminal

F25

29

33

Revving up to 4,000 rpm under no 
load at least 10 times

The voltage should be above 0.68 V 
at least once during this procedure.
The voltage should be below 0.18 V 
at least once during this procedure.

ECM

Condition

Voltage

Connector

+

−

Terminal

F25

29

33

Keeping engine speed at idle for 10 
minutes

The voltage should be above 0.68 V 
at least once during this procedure.
The voltage should be below 0.18 V 
at least once during this procedure.