DTC P0463: Fuel Level Sending Unit Volts Too High: Testing
- Turn ignition on. Using scan tool, read FUEL LEVEL SENSOR voltage. If voltage is more than 9.9 volts, go to next step. If voltage is 9.9 volts or less, go to step 6.
- Turn ignition off. Disconnect fuel pump module connector. Fuel pump module is mounted in top of fuel tank. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, connect a jumper wire between fuel pump module harness connector terminals No. 2 (Black/Light Blue wire) and No. 3 (Dark Blue/White wire). See Fig 1. Turn ignition on. Using scan tool, read FUEL LEVEL SENSOR voltage. If voltage did not change from more than 9.9 volts to less than 0.4 volt, go to next step. If voltage changed from more than 9.9 volts to less than 0.4 volt, replace fuel level sensor. Fuel level sensor is located on fuel pump module and can be replaced separately. See FUEL LEVEL SENSOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article.
- Turn ignition off. Disconnect jumper wire. Disconnect PCM connectors. PCM is located in engine compartment on passenger-side inner fender panel. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Black/Light Blue wire between fuel pump module harness connector terminal No. 2 and PCM harness connector C1 terminal No. 4. See Figure and Fig 1
. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire between fuel pump module and PCM.
- Turn ignition off. Measure resistance of Dark Blue/White wire between fuel pump module harness connector terminal No. 3 and PCM harness connector C3 terminal No. 26. See Figure and Fig 1
. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/White wire between fuel pump module and PCM.
- At this time, PCM is assumed to be defective. Replace PCM.
- Ensure ignition is on, with engine off. Using scan tool, monitor FUEL LEVEL SENSOR voltage while wiggling fuel pump module connector and wiring harness. Fuel pump module is mounted in top of fuel tank. If voltage changes while wiggling wiring harness, repair wiring harness where wiggling caused voltage to change. If voltage does not change while wiggling wiring harness, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, no problem is indicated at this time. Test is complete.
Courtesy of DAIMLERCHRYSLER CORPORATION