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Nissan Sentra Service Manual: P0031, P0032 A/F sensor 1 Heater

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0031, P0032 A/F sensor 1 Heater

DTC Logic

DTC DETECTION LOGIC

DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause
P0031 A/F SEN 1 HTR (B1) (HO2S heater control circuit low bank 1 sensor 1) The current amperage in the A/F sensor 1 heater circuit is out of the normal range.

(An excessively low voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (A/F sensor 1 heater circuit is open or shorted.)
  • A/F sensor 1 heater
P0032 A/F SEN 1 HTR (B1) (HO2S heater control circuit high bank 1 sensor 1) The current amperage in the A/F sensor 1 heater circuit is out of the normal range.

(An excessively high voltage signal is sent to ECM through the A/F sensor 1 heater.)
  • Harness or connectors (A/F sensor 1 heater circuit is shorted.)
  • A/F sensor 1 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 between 11 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Start engine and let it idle for at least 10 seconds.
  2. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-176, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

  1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between A/F sensor 1 harness connector and ground.

*1: Except California


*1: Except California

*2: For California

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace error-detected parts.

2.CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

*1: Except California


*1: Except California

*2: For California

  1. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair open circuit, short to ground or short to power in harness or connectors.

3.CHECK A/F SENSOR 1 HEATER

Check the A/F sensor 1 heater. Refer to EC-177, "Component Inspection (A/F Sensor 1 Heater)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EM-30, "Exploded View".

Component Inspection (A/F Sensor 1 Heater)

1.CHECK AIR FUEL RATIO (A/F) SENSOR 1

  1. Turn ignition switch OFF.
  2. Disconnect A/F sensor 1 harness connector.
  3. Check resistance between A/F sensor 1 terminals as per the following.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace air fuel ratio (A/F) sensor 1. Refer to EM-30, "Exploded View".

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