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Home >> Infiniti >> 2000 >> QX4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0180: Fuel Tank Temperature (FTT) Sensor >> Procedure
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DTC P0180: Fuel Tank Temperature (FTT) Sensor: Procedure

  1. Turn ignition off. Disconnect FTT sensor harness connector, located behind access panel under rear seat. Turn ignition on. Measure voltage between FTT sensor harness connector Light Green/Black wire and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Light Green/Black wire.
  2. Turn ignition off. Check continuity between FTT harness connector Black wire and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
  3. Remove FTT sensor. Measure resistance between sensor terminals. At 68°F (20°C), resistance should be 2300-2700 ohms. At 122°F (50°C), resistance should be 790-900 ohms. Resistance should decrease as temperature increases. See Figure. If resistance is not as specified, replace FTT sensor. If resistance is as specified, go to next step.
  4. No problem is currently indicated. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
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