DTC P0110: Intake Air Temperature (IAT) Sensor: Procedure

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/Green wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and IAT sensor. Retest system.
Turn ignition off. Check continuity between engine ground and IAT sensor harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. Repair circuit as necessary and retest system. See SYSTEM WIRING DIAGRAMS article. If ground circuit is okay, go to next step.
Remove IAT sensor, and place in heated water. Measure resistance between IAT sensor terminals, with water at specified temperatures. See IAT SENSOR RESISTANCE table. 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 TROUBLE SHOOTING - NO CODES article.

IAT SENSOR RESISTANCE

Temperature - °F (°C)

⁽¹⁾ Ohms

68 (20)

2100-2900

176 (80)

270-380

⁽¹⁾	Resistance should decrease as temperature increases. See Fig 2.

Fig 1: Locating IAT Sensor Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Temperature Sensor Resistance

Courtesy of NISSAN MOTOR CO., U.S.A.