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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics - 2.5) >> Diagnostic Tests >> DTC P0037 Or DTC P0038 >> 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.
  1. Turn ignition off. Disconnect rear HO2S harness connector. See Figure. Turn ignition on. Measure voltage between ground and rear HO2S harness connector terminal No. 3 (Blue/Red wire). See Figure. If battery voltage exists, go to step  3. If battery voltage does not exist, go to next step.
  2. Check the following:
    • Harness connectors E9 and F47.
    • Harness connectors M19 and E108.
    • Fuse block connector M1.
    • Fuse No. 8 (15-amp).
    • Harness for open or short between HO2S and fuse.

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

  3. Turn ignition off. Disconnect ECM harness connector. See Figure. Check continuity of Pink/Black wire between rear HO2S harness connector terminal No. 2 and ECM harness connector terminal No. 4. See Figure. Continuity should exist. Also, check circuit for short to ground and short to voltage. Repair circuit as necessary and perform DTC CONFIRMATION TEST  to verify repair. If circuit is okay, go to next step.
    4. CAUTION: DO NOT reuse any HO2S that has been dropped from a height of 20" (.5 m) or more onto a hard surface such as concrete.
  4. Measure resistance between rear HO2S connector terminals. See Figure and HO2S HEATER RESISTANCE SPECIFICATIONS  for terminal selections. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S and perform DTC CONFIRMATION TEST  to verify repair.
  5. Problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
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