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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect front HO2S harness connector located near oil filler cap. Turn ignition on. Measure voltage between ground and front HO2S harness connector terminal No. 3 (Blue/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit and retest system. See WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect ECM harness connector. See Figure. Check continuity of Black wire between ECM harness connector terminal No. 119 and front HO2S harness connector terminal No. 1. See Figure. Continuity should exist. Also, check circuit for short to ground and short to voltage. Repair circuit as necessary and retest system. If circuit is okay, go to next step.
  3. Turn ignition off. Measure resistance between HO2S connector terminals No. 1 and 3 (component side). Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S connector terminals No. 1 and 2, and between terminals No. 2 and 3 (component side). Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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