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.
- Turn ignition off. Disconnect IAT sensor harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and IAT sensor harness connector terminal No. 1 (Yellow/Black wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Yellow/Black wire between IAT sensor and ECM, then retest system.
- Turn ignition off. Check continuity between ground and IAT sensor harness connector terminal No. 2 (Black wire). Continuity should exist. Also, check circuit for short to voltage. See 2.5L under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS in ELECTRICAL. Repair circuit as necessary and retest system. If circuit is okay, go to next step.
- Measure resistance between IAT sensor terminals (component side), with sensor at specified temperatures. See IAT SENSOR RESISTANCE . If resistance is as specified, go to next step. If resistance is not as specified, replace IAT sensor and retest system.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
IAT SENSOR RESISTANCE
| Temperature - °F (°C) | (1) Ohms | ||
|---|---|---|---|
| 68 (20) | 2100-2900 | ||
| 176 (80) | 270-380 | ||
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