DTC P0462: FUEL LEVEL SENDING UNIT VOLTS TOO LOW
1. Turn ignition on with engine off. Using scan tool, read fuel level sensor voltage. If fuel level sensor voltage is less than .4 volt, go to next step. If fuel level sensor voltage is .4 volt or more, go to step 5 .
2. Turn ignition off. Disconnect fuel pump module connector. Fuel pump module is located on top of fuel tank and contains fuel level sensor along with fuel supply and return line fittings. Fuel pump module may also be referred to as fuel tank module. Turn ignition on with engine off. Using scan tool, read fuel level sensor voltage. If fuel level sensor voltage is 9 volts or less, go to next step. If fuel level sensor voltage is more than 9 volts, replace fuel level sensor. Fuel level sensor is located on fuel pump module. Perform TEST VER-2A .
3. Turn ignition off. Ensure fuel pump module connector is still disconnected. Disconnect PCM connectors. PCM is located at passenger's side rear corner of engine compartment. Using ohmmeter, check resistance between terminals No. 1 (Black wire) and No. 3 (Dark Blue/White wire) on fuel pump module connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair Black wire and Dark Blue/White wire as they are shorted together. Black wire goes from fuel level sensor to ground connection located at driver's side front corner of engine compartment, on fender inner panel, near windshield washer fluid reservoir. Dark Blue/White wire goes from fuel pump module to PCM. This is the fuel level sensor signal wire. Perform TEST VER-2A .
4. Ensure fuel pump module connector and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and No. 3 (Dark Blue/White wire) on fuel pump module connector. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A . If resistance is less than 5 ohms, short to ground on Dark Blue/White wire between PCM and fuel pump module. Perform TEST VER-2A .
5. Ensure ignition is on with engine off. Using scan tool, monitor fuel level sensor voltage while wiggling wiring harness and connectors between fuel pump module and PCM. Fuel pump module is located on top of fuel tank and contains fuel level sending unit along with fuel supply and return line fittings. Fuel pump module may also be referred to as fuel tank module. PCM is located at passenger's side rear corner of engine compartment. If fuel level sensor voltage does not change while wiggling wiring harness and connectors, go to next step. If fuel level sensor voltage changes while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform TEST VER-2A .
6. Turn ignition off. Inspect wiring harness and connectors between fuel pump module and PCM. If no problems exist, test is complete. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A .