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DTC P1401 - EGR Temperature Sensor

  1. Check Power Supply

    Turn ignition off. Disconnect EGR temperature sensor harness connector. See Fig 1. Turn ignition on. Measure voltage between EGR temperature sensor connector terminal "1" (Orange/Black wire) and ground. See Fig 2. If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.

  2. Check Ground Circuit

    Turn ignition off. Verify harness continuity between EGR temperature sensor connector terminal "2" (Black/Yellow wire) and engine ground. See Fig 3. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

  3. 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: Locating EGR Temperature Sensor Connector (Q45)
G96H10758Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC P1401, Checking Power Supply (Q45)
G96I10759Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: DTC P1401, Checking Ground Circuit (Q45)
G96B10760Courtesy of NISSAN MOTOR CO., U.S.A.
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