DTC Description

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 (manifold) 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 the various driving condition such as fuel-cut.

: 0.71 V

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P0137	00	O2 sensor bank 1 sensor 2 (O2 sensor circuit low voltage 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
Fuel injector
Intake air leaks

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.INSPECTION START

Do you have M.U.T.-III SE?

2.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30°C (32 to 86°F).

3.PERFORM DTC CONFIRMATION PROCEDURE

With M.U.T.-III SE

Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
Start engine and warm it up to normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
Let engine idle for 1 minute.
Make sure that “COOLANT TEMP/S” indicates more than 70°C (158°F).
If not, warm up engine and go to next step when “COOLANT TEMP/S” indication reaches 70°C (158°F).
Open engine hood.
Select “HO2S2 (B1) P1147” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using M.U.T.-III SE.
Follow the instruction of M.U.T.-III SE.
note It will take at most 10 minutes until “COMPLETED” is displayed.
Touch “SELF-DIAG RESULT”.

Which is displayed on M.U.T.-III SE screen?

INSPECTION END

Refer to DTC Diagnosis Procedure

4.PERFORM DTC CONFIRMATION PROCEDURE AGAIN

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
Perform DTC CONFIRMATION PROCEDURE again.

5.PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to Component Function Check

note	Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END

Proceed to DTC Diagnosis Procedure