DTC P1401: EGR Temperature Sensor

Check Power Supply - Turn ignition off. Disconnect EGR temperature sensor harness connector. See Figure. Turn ignition on. Measure voltage between EGR temperature sensor connector terminal No. 1 (White wire) and ground. If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.
Check Ground Circuit - Turn ignition off. Loosen and retighten engine ground bolts. See Figure. Verify harness continuity between EGR temperature sensor connector terminal No. 2 (Black wire) and engine ground. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
Check Component - Remove EGR temperature sensor. Immerse sensor in fluid. Measure resistance of EGR temperature sensor while varying temperature of fluid. Ensure sensor resistance is correct. See EGR TEMPERATURE SENSOR RESISTANCE table. Repair or replace if necessary and perform FINAL CHECK.

EGR TEMPERATURE SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

⁽²⁾ Ohms

32 (0)

7.9-9.7

122 (50)

.57-70

212 (100)

.08-1.0

⁽¹⁾	Heat sensor in water and measure resistance across sensor terminals.

⁽²⁾	Megohms are given.

Fig 1: Locating EGR Temperature Sensor Connector

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