Nissan GT-R (R35) · Service Manual ENGINE

P0138, P0158 HO2S2

VR38

P0138 P0158

Description


The heated oxygen sensor 2, after three way catalyst 1, monitors the oxygen level in the exhaust gas on each bank.

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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 signal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions.
Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

DTC Logic

 
 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 oxygen storage capacity of the three way catalyst 1 causes the longer switching time.
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the voltage is unusually high during various driving conditions such as fuelcut.

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MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage of sensor is sufficiently low during various driving conditions such as fuelcut.

PBIB2376E.JPG

DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0138
Heated oxygen sensor 2 (bank 1) circuit high voltage
A)
An excessively high voltage from the sensor is sent to ECM.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Heated oxygen sensor 2
B)
The minimum voltage from the sensor does not reach to the specified voltage.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Heated oxygen sensor 2
  • Fuel pressure
  • Fuel injector
P0158
Heated oxygen sensor 2 (bank 2) circuit high voltage
A)
An excessively high voltage from the sensor is sent to ECM.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Heated oxygen sensor 2
B)
The minimum voltage from the sensor does not reach to the specified voltage.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Heated oxygen sensor 2
  • Fuel pressure
  • Fuel injector

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
 
 3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
 
 4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
 
 5.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

Component Function Check


 
 1.PERFORM COMPONENT FUNCTION CHECK-I
 
 2.PERFORM COMPONENT FUNCTION CHECK-II
 
 3.PERFORM COMPONENT FUNCTION CHECK-III

Diagnosis Procedure


 
 1.INSPECTION START
 
 2.CHECK GROUND CONNECTION
 
 3.CHECK HO2S2 CONNECTOR FOR WATER
 
 4.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
 
 5.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 6.CHECK HEATED OXYGEN SENSOR 2
 
 7.REPLACE HEATED OXYGEN SENSOR 2
 
 8.CHECK INTERMITTENT INCIDENT
 
 9.CHECK GROUND CONNECTION
 
 10.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
 
 11.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
 
 12.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 13.CHECK HEATED OXYGEN SENSOR 2
 
 14.REPLACE HEATED OXYGEN SENSOR 2
 
 15.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.INSPECTION START
 
 2.CHECK HEATED OXYGEN SENSOR 2
 
 3.CHECK HEATED OXYGEN SENSOR 2-I
 
 4.CHECK HEATED OXYGEN SENSOR 2-II
 
 5.CHECK HEATED OXYGEN SENSOR 2-III
 
 6.REPLACE HEATED OXYGEN SENSOR 2