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DTC Description
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 (manifold) causes the longer switching time.
: 0.71 V
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 fuel cut.
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P227100O2 sensor signal bank 1 sensor 2
(O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2)
Diagnosis condition—
Signal (terminal)Heated oxygen sensor 2 signal
Threshold
  • The maximum voltage from the sensor does not reach the specified voltage
  • ECM detects the heated oxygen sensor 2 circuit is short to ground.
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • Harness or connectors (The heated oxygen sensor 2 circuit is open or shorted.)
  • Heated oxygen sensor 2
  • Fuel pressure
  • Direct fuel injector
  • Port fuel injector
  • Intake air leaks
 
 
FAIL-SAFE
Not applicable
 
 
DTC Confirmation Procedure
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
TESTING CONDITION:
Check that “COOLANT TEMP/S” indicates between 0°C to 30°C (30°F to 86°F) before conducting following procedure.
.
 
2.PERFORM COMPONENT FUNCTION CHECK
Perform Component Function Check. Refer to Component Function Check.
Is the inspection result normal?
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: .
Refer to DTC Diagnosis Procedure.
 
3.ERASE DTC
Erase DTC of ECM.
: INSPECTION END