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Nissan Titan. Manual - part 230

P0137, P0157 HO2S2

EC-221

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0137, P0157 HO2S2

Component Description

INFOID:0000000009886631

The heated oxygen sensor 2, after three way catalyst (manifold),

monitors the oxygen level in the exhaust gas on each bank.

Even if switching characteristics of the air fuel ratio (A/F) sensor 1

are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-

nal from the heated oxygen sensor 2.

This sensor is made of ceramic zirconia. The zirconia generates volt-

age from approximately 1V in richer conditions to 0V in leaner condi-

tions.

Under normal conditions the heated oxygen sensor 2 is not used for

engine control operation.

On Board Diagnosis Logic

INFOID:0000000009886632

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

INFOID:0000000009886633

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.

WITH CONSULT

TESTING CONDITION:

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

°C (32 to 86 °F).

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the 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).

SEF327R

PBIB1154E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0137
0137
(Bank 1)

Heated oxygen sensor 2
circuit low voltage

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

• Harness or connectors

(The sensor circuit is open or shorted)

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

P0157
0157
(Bank 2)

EC-222

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0137, P0157 HO2S2

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

°C (158°F).

7. Open engine hood.
8. Select “HO2S2 (B1) P1147” (for DTC P0137) or “HO2S2 (B2) P1167” (for DTC P0157) of “HO2S2” in

“DTC WORK SUPPORT” mode with CONSULT.

9. Start engine and following the instruction of CONSULT.

NOTE:

It will take at most 10 minutes until “COMPLETED” is displayed.

10. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.

If “NG” is displayed, refer to

EC-222, "Diagnosis Procedure"

If “CAN NOT BE DIAGNOSED” is displayed, perform the following.

a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.

Overall Function Check

INFOID:0000000009886634

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st

trip DTC might not be confirmed.

WITH GST

1. Start engine and warm it up to the 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. Set voltmeter probes between ECM terminal 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and

ground.

6. Check the voltage when revving up to 4,000 rpm under no load

at least 10 times.

(Depress and release accelerator pedal as soon as possible.)

The voltage should be above 0.58V at least once during this

procedure.

If the voltage can be confirmed in step 6, step 7 is not nec-

essary.

7. Keep vehicle at idling for 10 minutes, then check the voltage. Or

check the voltage when coasting from 80 km/h (50 MPH) in D

position.

The voltage should be above 0.58V at least once during this

procedure.

8. If NG, go to

EC-222, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000009886635

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body.

Refer to

EC-154, "Ground Inspection"

OK or NG

>> GO TO 2.

PBIB2054E

BBIA0354E

P0137, P0157 HO2S2

EC-223

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

>> Repair or replace ground connections.

CLEAR THE SELF-LEARNING DATA

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

3. Clear the self-learning control coefficient by touching “CLEAR”.

4. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 or P0174 detected?

Is it difficult to start engine?

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor harness connector, and restart

and run engine for at least 5 seconds at idle speed.

4. Stop engine and reconnect mass air flow sensor harness con-

nector.

5. Make sure DTC P0102 is displayed.

6. Erase the DTC memory. Refer to

EC-46, "DIAGNOSIS

DESCRIPTION : Malfunction Indicator Lamp (MIL)"

7. Make sure DTC P0000 is displayed.

8. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 or P0174 detected?

Is it difficult to start engine?

Yes or No

Yes

>> Perform trouble diagnosis for DTC P0171or P0174. Refer to

EC-240

>> GO TO 3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

3. Disconnect ECM harness connector.

4. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.

Refer to Wiring Diagram.

5. Also check harness for short to power.
OK or NG

>> GO TO 4.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal and HO2S2 terminal as follows.

Refer to Wiring Diagram.

BBIA0368E

Continuity should exist.

BBIA0435E

EC-224

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P0137, P0157 HO2S2

2. Check harness continuity between the following terminals and ground.

Refer to Wiring Diagram.

3. Also check harness for short to power.
OK or NG

>> GO TO 5.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HEATED OXYGEN SENSOR 2

Refer to

EC-224, "Component Inspection"

OK or NG

>> GO TO 6.

>> Replace malfunctioning heated oxygen sensor 2.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "How to Check Terminal"

and

GI-42, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000009886636

HEATED OXYGEN SENSOR 2

With CONSULT

6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item

with CONSULT.

DTC

Terminals

Bank

ECM

Sensor

P0137

P0157

Continuity should exist.

DTC

Terminals

Bank

ECM

Sensor

P0137

P0157

Continuity should not exist.

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