Nissan GT-R (R35) · Service Manual ENGINE

P0139, P0159 HO2S2

VR38

P0139 P0159

Description


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

SEF327R.JPG
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. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the switching response of the sensor's voltage is faster than specified during various driving conditions such as fuelcut.

SEF302U.JPG


DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0139
Heated oxygen sensor 2 (bank 1) circuit slow response
It takes more time for the sensor to respond between rich and lean than the specified time.
  • Harness or connectors
    (The sensor circuit is open or shorted)
  • Heated oxygen sensor 2
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
P0159
Heated oxygen sensor 2 (bank 2) circuit slow response

 
 DTC CONFIRMATION PROCEDURE

 
 1.INSPECTION START
 
 2.PRECONDITIONING
 
 3.PERFORM DTC CONFIRMATION PROCEDURE
 
 4.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
 
 5.PERFORM COMPONENT FUNCTION CHECK

Component Function Check


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

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
 
 3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
 
 4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 5.CHECK HEATED OXYGEN SENSOR 2
 
 6.REPLACE HEATED OXYGEN SENSOR 2
 
 7.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