DTC P0463: Fuel Level Sensor Circuit High Input
- 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.
- Turn ignition on. Using voltmeter 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 4.75 volts or less, system has returned to normal. Check for poor contact at fuel pump, ECM or instrument cluster connectors.
- Turn ignition off. Disconnect instrument cluster connector (13-pin on Forester, 10-pin on Impreza, 30-pin on Legacy) and ECM connector B136 (30-pin connector). See Figure, Figure, Figure and Figure
. Using voltmeter 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, repair short between ECM and instrument cluster connectors. See appropriate wiring diagram in WIRING DIAGRAMS
article.
- Turn ignition off. Remove service hole cover located in left rear of trunk floor (sedan), or luggage compartment floor (wagon). Disconnect 12-pin (6-pin on Legacy) in-line connector located between rear wiring harness and fuel tank harness (nearest fuel tank). Measure resistance between ECM connector B136 (30-pin connector) terminal No. 27 and ECM-side of 12-pin (6-pin on Legacy) in-line connector terminal No. 3 (No. 6 on Legacy). 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, repair open circuit between ECM and fuel tank harness.
Courtesy of SUBARU OF AMERICA, INC.
- Measure resistance between ground and ECM-side of 12-pin (6-pin on Legacy) in-line connector terminal No. 2 (No. 5 on Legacy). If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, check for an open in wiring between fuel tank harness and ground.
- Disconnect 6-pin electrical connector from fuel level sensor. Using an ohmmeter, measure resistance between fuel level sensor terminal No. 5 (No. 3 on Legacy) and fuel tank-side of 12-pin (6-pin on Legacy) in-line connector terminal No. 2 (No. 5 on Legacy). See Figure, Figure and Fig 2
. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, check for an open in wiring between in-line harness connector and fuel level sensor.
Courtesy of SUBARU OF AMERICA, INC.
- Turn ignition off. Disconnect connector from fuel sub level sensor. Using an ohmmeter, measure resistance between fuel level sensor harness connector terminal No. 3 (No. 6 on Legacy) 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, check for an open in wiring between fuel level sensor and sub level sensor.
- Measure resistance between fuel sub level sensor harness connector terminal No. 1 and fuel tank-side of 12-pin (6-pin on Legacy) in-line connector terminal No. 3 (No. 6 on Legacy). 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, check for an open circuit between fuel tank harness connector and fuel sub level sensor connector.
- Remove fuel pump assembly from fuel tank. While moving fuel level float up and down, measure resistance across terminals No. 3 and 6 of 6-pin fuel level sensor. See Figure. 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.
- Remove fuel sub level sensor. While moving fuel level float up and down, measure resistance across fuel sub level sensor terminals. See Figure. 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.