Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0037, P0038 HO2s2 heater
DTC Logic

DTC DETECTION LOGIC

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P0037 HO2 HTR (B1) (Heated oxygen sensor 2 heater control circuit low) The current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range.

(An excessively low voltage signal is sent to ECM through the heated oxygen sensor 2 heater.)

  • Harness or connectors (Heated oxygen sensor 2 heater circuit is open or shorted.)
  • Heated oxygen sensor 2 heater
P0038 HO2 HTR (B1) (Heated oxygen sensor 2 heater control circuit high) The current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range.

(An excessively high voltage signal is sent to ECM through the heated oxygen sensor 2 heater.)

  • Harness or connectors (Heated oxygen sensor 2 heater circuit is open or shorted.)
  • Heated oxygen sensor 2 heater

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

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

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

TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

  1. Turn ignition switch ON and select "DATA MONITOR" mode of "ENGINE" using CONSULT.
  2. Start engine and warm it up to normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
  5. Let engine idle for 1 minute.
  6. Check 1st trip DTC.

With GST

Follow the procedure "With CONSULT" above.

Is 1st trip DTC detected?

YES >> Proceed to EC, "Diagnosis Procedure".

NO >> INSPECTION END

    More about «P0037, P0038 HO2s2 heater»:

    DTC Logic

    Diagnosis Procedure

    Component Inspection

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