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Home >> Infiniti >> 2002 >> G20 Standard, RS5F70W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - G20 >> Diagnostic Tests >> DTC P1401: EGR Temperature Sensor >> Diagnostic Procedure

Diagnostic 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.
  2. Turn ignition off. Check continuity between engine ground and EGR temperature sensor harness connector terminal No. 2 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If a problem is found, go to next step. If circuit is okay, go to step  4.
  3. Check the following:
    • Check for open or short in Black wire between EGR temperature sensor harness connector terminal No. 2 and ECM harness connector terminal No. 59. See Figure and Figure .
    • Check for open or short in Black wire between EGR temperature sensor harness connector terminal No. 2 and TCM harness connector terminal No. 42. See Figure and Figure .

    Repair as necessary.

  4. 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.
  5. 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.
  6. If using CONSULT-II, go to next step. If using generic scan tool, go to step  8.
  7. Remove EGR-VCV. Reconnect all harness connectors. Turn ignition on. Perform EGR VOL CONT/V in ACTIVE TEST mode with CONSULT-II. EGR-VCV shaft should move smoothly forward and backward according to valve opening steps on CONSULT-II. If operation is as specified, go to step  9. If operation is not as specified, replace EGR-VCV.
  8. 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.
  9. 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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