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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1166 (Engine Control System - DTCS U0101 To P0153) >> P0131, P0151 A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect A/F sensor 1 harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between A/F sensor 1 harness connector and ground.
    TERMINAL CONNECTOR REFERENCE CHART

    DTC A/F sensor 1 Ground Voltage
    Bank Connector Terminal
    P0131 1 F12 4 Ground Battery voltage
    P0151 2 F61 4
    Fig 1: Checking Voltage Between A/F Sensor 1 Harness Connector And Ground
    G05869768Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector F10
    • 15 A fuse (No. 37)
    • Harness for open or short between A/F sensor 1 and fuse

    4. : Repair or replace harness or connectors.

  4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    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.
      TERMINAL CONNECTOR REFERENCE CHART

      DTC A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0131 1 F12 1 F13 45 Existed
      2 49
      P0151 2 F61 1 53
      2 57
    4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      TERMINAL CONNECTOR REFERENCE CHART

      DTC A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      P0131 1 F12 1 Ground Not existed
      2
      P0151 2 F61 1
      2
      TERMINAL CONNECTOR REFERENCE CHART

      DTC ECM Ground Continuity
      Connector Terminal
      P0131 F13 45 Ground Not existed
      49
      P0151 53
      57
    5. Also check harness for short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

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

  5. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace malfunctioning part.

  6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1.

CAUTION:
  • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
  • Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).

: INSPECTION END

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