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DTC P1401: EGR Temperature Sensor: Procedure

  1. Turn ignition off. Disconnect EGR temperature sensor harness connector located near EGR valve. Turn ignition on. Measure voltage between ground and EGR temperature sensor harness connector terminal No. 1 (Blue/Yellow wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Blue/Yellow wire and retest system.
  2. Turn ignition off. Check continuity between engine ground and EGR temperature sensor harness connector terminal No. 2 (Black wire). Also check circuit for short to voltage. Repair circuit as necessary and retest system. If ground circuit is okay, go to next step.
  3. Remove EGR temperature sensor, and place in heated water. Measure resistance between EGR temperature sensor terminals, with water at specified temperatures. See EGR TEMPERATURE SENSOR RESISTANCE  table. If resistance is as specified, go to next step. If resistance is not as specified, replace EGR temperature sensor and retest system.
  4. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
EGR TEMPERATURE SENSOR RESISTANCE

Temperature - °F (°C) K/Ohms
32 (0) 680-1110
122 (50) 90-120
212 (100) 17-24
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