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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0037, DTC P0038, DTC P0057 Or DTC P0058 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit wiring diagram, see Fig 1 or Fig 2 . For connector identification and locations, see CONNECTOR IDENTIFICATION  .

  1. Check Power Supply

    Turn ignition off. Disconnect appropriate HO2S2 harness connector. See Figure . Turn ignition on. Measure voltage between ground and HO2S2 harness connector terminal No. 3. See Fig 1 or Fig 2 . If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.

  2. Detect Malfunctioning Part

    Check the following:
    • Fuse No. 8 (15-amp).
    • Fuse block connector M1.
    • Harness connectors M19 and E108.
    • Harness connectors E9 and F47.
    • Harness for open or short between HO2S2 and fuse.

    Repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair.

  3. Check Output Signal Circuit

    Turn ignition off. Disconnect ECM harness connector. See Figure . On bank 1, check continuity between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 30. See Fig 1 or Fig 2 . On bank 2, check continuity between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 3. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  4. Check HO2S2 Heater

    Measure resistance between HO2S2 terminals No. 2 and 3. See Figure . Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1. Perform DTC CONFIRMATION TEST  to verify repair.

  5. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST  to verify repair.
Fig 1: HO2S2 Heater Wiring Diagram (Bank 1)
G00156694Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: HO2S2 Heater Wiring Diagram (Bank 2)
G00156695Courtesy of NISSAN MOTOR CO., U.S.A.
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