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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0461: Fuel Level Sensor - Range/Performance >> DTC Confirmation Test (Using Generic Scan Tool)
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DTC Confirmation Test (Using Generic Scan Tool)

NOTE: Use the following test to check overall function of fuel level sensor circuit. During this test, 1st trip DTC may not be confirmed.
  1. To check overall function of fuel level sensor circuit, release fuel system pressure. See FUEL PRESSURE RELEASE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. Remove fuel feed hose from fuel level sensor/pump unit located behind access cover, under rear seat.
    2. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  2. Connect a length of fuel hose to fuel feed port at fuel level sensor/pump unit. Place other end of hose into a suitable fuel container. Turn ignition off. Backprobbing at ECM, connect DVOM probes between ground and ECM terminal No. 83 (Yellow/Purple wire) fuel level sensor signal circuit. See Figure and Figure . Turn ignition on and monitor DVOM.
  3. Using suitable equipment, drain 7.93 gals. (30.0L) of fuel from tank. Refill tank with drained fuel. Voltage should change .03 volt or more during draining and refilling. If voltage is not as specified, check fuel level sensor. For testing procedure, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If problem is found, replace fuel level sensor. After repair, repeat appropriate DTC confirmation procedure. If voltage is as specified, system is okay at this time.
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