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Home >> Subaru >> 2001 >> Outback Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L & 2.5L >> Diagnostic Tests >> DTC P0463: Fuel Level Sensor Circuit High Input

DTC P0463: Fuel Level Sensor Circuit High Input

  1. Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . Check speedometer and tachometer operation. If speedometer and tachometer operate normally, go to next step. If speedometer and tachometer do not operate normally, repair or replace instrument cluster.
  2. Turn ignition on. Using DVOM connected to ground, backprobe ECM connector B136 (30-pin connector) terminal No. 27. See Figure. If voltage is more than 4.75 volts, go to next step. If voltage is not more than 4.75 volts, system has returned to normal. Check for poor terminal contact in connectors between fuel pump, ECM and instrument cluster.
  3. Turn ignition off. Disconnect 10-pin instrument panel electrical harness connector (30-pin on Legacy and Outback 2.5L) and ECM connector B136 (30-pin connector). See Figure, Figure and Figure . Using DVOM connected to ground, backprobe ECM connector B136 (30-pin connector) terminal No. 27. If voltage is more than 4.75 volts, go to next step. If voltage is not more than 4.75 volts, locate and repair short in wiring between ECM and instrument cluster. See WIRING DIAGRAMS article.
  4. Turn ignition off. Remove service hole cover located in left rear of trunk floor (sedan), or luggage compartment floor (wagon). Disconnect 6-pin (12-pin on Forester, Impreza and Outback Sport) in-line connector located between rear harness and fuel tank harness (nearest fuel tank). Measure resistance between ECM connector B136 (30-pin connector) terminal No. 27 and ECM-side of 6-pin (12-pin on Forester, Impreza and Outback Sport) in-line connector terminal No. 6 (No. 3 on Forester, Impreza and Outback Sport). See Figure, Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, locate and repair open circuit in wiring between ECM and fuel tank.
    Fig 1: ECM-Side Of Fuel Pump Harness Connector Terminal Identification (Legacy & Outback 2.5L)
    G00013021Courtesy of SUBARU OF AMERICA, INC.
  5. Measure resistance between ground and ECM-side of 6-pin (12-pin on Forester, Impreza and Outback Sport) in-line connector terminal No. 5 (No. 2 on Forester, Impreza and Outback Sport). If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, locate and repair open circuit in wiring and check for poor terminal contact in connectors between fuel tank and ground.
  6. Disconnect 6-pin electrical connector from fuel level sensor. Using an ohmmeter, measure resistance between fuel level sensor terminal No. 3 (No. 5 on Forester, Impreza and Outback Sport) and fuel pump-side of 6-pin (12-pin on Forester, Impreza and Outback Sport) in-line connector terminal No. 5 (No. 2 on Forester, Impreza and Outback Sport). See Figure, Figure and Fig 2 . If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, locate and repair open circuit in wiring and check for poor terminal contact in connectors between in-line harness connector and fuel level sensor.
    Fig 2: Fuel Pump-Side Of Fuel Pump Harness Connector Terminal Identification (Legacy & Outback 2.5L)
    G00013022Courtesy of SUBARU OF AMERICA, INC.
  7. Turn ignition off. Disconnect 2-pin connector from fuel sub level sensor. Using an ohmmeter, measure resistance between 6-pin fuel level sensor harness connector terminal No. 6 (No. 3 on Forester, Impreza and Outback Sport) and fuel sub level sensor connector terminal No. 2. See Figure and Figure . If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, locate and repair open circuit in wiring between fuel level sensor and fuel sub level sensor.
  8. Measure resistance between 2-pin fuel sub level sensor harness connector terminal No. 1 and fuel pump-side of 6-pin (12-pin on Forester, Impreza and Outback Sport) in-line connector terminal No. 6 (No. 3 on Forester, Impreza and Outback Sport). See Figure, Figure and Fig 2 . If resistance is less than 10 ohms, go to next step. If resistance is not less than 10 ohms, locate and repair open circuit in wiring between fuel tank harness and fuel sub level sensor.
  9. Remove fuel pump assembly from fuel tank. While moving fuel level sensor float up and down, measure resistance across terminals No. 3 and No. 6 of fuel level sensor. If resistance is more than 54.5 ohms, replace fuel level sensor. If resistance is not more than 54.5 ohms, go to next step.
  10. Remove fuel sub level sensor. While moving fuel sub level sensor float up and down, measure resistance across fuel sub level sensor terminals. If resistance is more than 41.5 ohms, replace fuel sub level sensor. If resistance is not more than 41.5 ohms, replace instrument cluster. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .
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