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 "1" (Brown wire) and ground. See Fig 1. 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. Verify harness continuity between EGR temperature sensor connector terminal "2" (Orange/Blue wire) and engine ground. See Figure. 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

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: DTC P1401, Checking Power Supply (J30)

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

Fig 2: DTC P1401, Checking Ground Circuit (J30)

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