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Home >> Infiniti >> 2001 >> G20 Base, Automatic, RE4F03W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1401: EGR Temperature Sensor >> Procedure
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DTC P1401: EGR Temperature Sensor: Procedure

  1. Turn ignition off. Disconnect EGR temperature sensor harness connector. See Figure. Turn ignition on. Measure voltage between ground and EGR temperature sensor harness connector terminal No. 1 (Red/Black 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 EGR temperature sensor. 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. See WIRING DIAGRAMS article. Repair circuit as necessary and retest system. If ground circuit is okay, go to next step.
  3. Remove EGR temperature sensor. Measure resistance between EGR temperature sensor terminals, with EGR temperature sensor 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. Disconnect EGR Volume Control Valve (EGR-VCV) harness connector. See Figure. Measure resistance between EGR-VCV terminals No. 2 and 1, No. 2 and 3, No. 5 and 4, and No. 5 and 6. See Figure. Resistance should be 20.9-23.1 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EGR-VCV and retest system.
  5. Remove EGR-VCV. Reconnect all harness connectors. While observing EGR-VCV shaft, turn ignition on and off. EGR-VCV shaft should move smoothly forward and backward according to ignition switch position. If operation is as specified, go to next step. If operation is not as specified, replace EGR-VCV and retest system.
  6. 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) 730-890
122 (50) 74-82
212 (100) 12-14
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