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.

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 fuel cut.

MALFUNCTION B

To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage is excessively high during various driving conditions such as fuel cut.

DTC DETECTION LOGIC

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P2270	00	O2 sensor signal bank 1 sensor 2 (O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2)	A	Diagnosis condition	—
				Signal (terminal)	Heated oxygen sensor 2 signal
				Threshold	An excessively high voltage from the sensor is sent to ECM
				Diagnosis delay time	—
			B	Diagnosis condition	—
				Signal (terminal)	Heated oxygen sensor 2 signal
				Threshold	The minimum voltage from the sensor is not reached to the specified voltage
				Diagnosis delay time	—

POSSIBLE CAUSE

P2270-A

Harness or connectors (The heated oxygen sensor 2 circuit is open or shorted.)
Heated oxygen sensor 2

P2270-B

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

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.

2.DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

Start engine and warm it up to the normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
Check 1st trip DTC.

Is 1st trip DTC detected?

Refer to DTC Diagnosis Procedure

-2Without M.U.T.-III SE:

3.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

4.ERASE DTC

Erase DTC of ECM.

: INSPECTION END