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 maximum voltage of the sensor is sufficiently high during various driving conditions such as fuelcut.

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DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0137
Heated oxygen sensor 2 (bank 1) circuit low voltage
The maximum 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
  • Intake air leaks
P0157
Heated oxygen sensor 2 (bank 2) circuit low voltage

 
 DTC CONFIRMATION PROCEDURE

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