Diagnostic Procedure (2.4L)
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Disconnect HO2S2 harness connector. See Fig 1 . Turn ignition on. Measure voltage between ground and HO2S2 harness connector terminal No. 2 (Black/Yellow wire). If battery voltage exists, go to step 3 . If battery voltage does not exist, go to next step.
- Check the following:
- Check fuse No. 14 (15-amp) located in fuse block under left side of instrument panel.
- Check for poor connection at fuse block connector M26 terminal 12P (Black/Yellow wire). See Figure .
- Check for open or short between HO2S2 and fuse.
Repair as necessary.
- Turn ignition off. Disconnect ECM harness connector. See Figure or Figure . Check continuity of Red/Black wire between HO2S2 harness connector terminal No. 3 and ECM harness connector terminal No. 4. See Figure . Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5 .
- Check the following:
- Check for poor connection at White, 20-pin connector M81 terminal No. 10 (Red/Black wire). See Fig 2 . Connector M81 is located behind right side of instrument panel. See Figure or Figure .
- Check for open or short between HO2S2 and ECM.
Repair as necessary.
- Measure resistance between HO2S2 terminals No. 2 and 3. See Fig 3 . 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.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.