Infiniti F50. Manual - part 398

 

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Infiniti F50. Manual - part 398

 

 

DTC P0134, P0154 HO2S1

EC-233

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DTC P0134, P0154 HO2S1

PFP:22690

Component Description

EBS00LZF

The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions. The
heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts
the injection pulse duration to achieve the ideal air-fuel ratio. The
ideal air-fuel ratio occurs near the radical change from 1 to 0V.

CONSULT-II Reference Value in Data Monitor Mode

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Specification data are reference values.

On Board Diagnosis Logic

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Under the condition in which the heated oxygen sensor 1 signal is
not input, the ECM circuits will read a continuous approximately
0.3V. Therefore, for this diagnosis, the time that output voltage is
within 200 to 400 mV range is monitored, and the diagnosis checks
that this time is not inordinately long.

SEF463R

SEF288D

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S1 (B1)
HO2S1 (B2)

Engine: After warming up

Maintaining engine speed at 2,000 rpm

0 - 0.3V 

←→

 Approx. 0.6 - 1.0V

HO2S1 MNTR (B1)
HO2S1 MNTR (B2)

Engine: After warming up

Maintaining engine speed at 2,000 rpm

LEAN 

←→

 RICH

Changes more than 5 times during 
10 seconds.

SEF237U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0134
0134
(Bank 1)

Heated oxygen sensor 1 
circuit no activity detected

The voltage from the sensor is constantly 
approx. 0.3V.

Harness or connectors
(The sensor circuit is open or shorted)

Heated oxygen sensor 1

P0154
0154
(Bank 2)

EC-234

DTC P0134, P0154 HO2S1

DTC Confirmation Procedure

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CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “HO2S1 (B1) P0134” or “HO2S1 (B2) P0154” of “HO2S1”
in “DTC WORK SUPPORT” mode with CONSULT-II.

3.

Touch “START”.

4.

Let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,600 rpm after this step. If
the engine speed limit is exceeded, return to step 4.

5.

When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 10 to 60 seconds.)

If “TESTING” is not displayed after 5 minutes, retry from
step 2.

6.

Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to 

EC-239, "Diagnostic

Procedure"

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PBIB0544E

ENG SPEED

1,100 - 3,600 rpm

Vehicle speed

More than 64 km/h (40 MPH)

B/FUEL SCHDL

1.6 - 12.0 msec

Selector lever

Suitable position

PBIB0545E

SEC750C

DTC P0134, P0154 HO2S1

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Overall Function Check

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Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a
DTC might not be confirmed.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Set voltmeter probes between ECM terminal 114 [HO2S1 (B1) signal] or 115 [HO2S1 (B2) signal] and
engine ground.

3.

Check the following with engine speed held at 2,000 rpm con-
stant under no load.

The voltage does not remain in the range of 0.2 to 0.4V.

4.

If NG, go to 

EC-239, "Diagnostic Procedure"

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PBIB0063E

EC-236

DTC P0134, P0154 HO2S1

Wiring Diagram

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BANK 1

TBWM0143E

 

 

 

 

 

 

 

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