2001 Chevrolet/Geo Camaro  

DTC P0463

Circuit Description

The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the IPC in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
Action Taken When the DTC Sets
Conditions for Clearing the DTC
Diagnostic Aids

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.). This will isolate when the DTC failed. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.

Test Description

The number below refers to the step number on the diagnostic table.

  1. Tests for the proper operation of the circuit in the low voltage range.

Step

Action

Values

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the IPC Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With a scan tool, observe the Fuel Tank Level Remaining parameter in the PCM EVAP data list.

Does the scan tool indicate that the Fuel Tank Level Remaining parameter is greater than the specified value?

98%

Go to Step 3

Go to Diagnostic Aids

3

  1. Turn OFF the ignition.
  2. Disconnect C405A/C405B.
  3. Connect a 3 ampere fused jumper between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side.
  4. Turn the ignition ON, with the engine OFF.
  5. With a scan tool, observe the Fuel Tank Level Remaining parameter.

Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?

3.5%

Go to Step 6

Go to Step 4

4

Test the signal circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 5

5

Test the low reference circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

6

Test the signal circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage between C405A/C405B and the fuel level sensor. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 7

7

Test the low reference circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage between C405A/C405B and the fuel level sensor. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 8

8

Inspect for poor connections at the harness connector of the fuel level sensor. Refer to Testing for Intermittent and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

10

Replace the fuel level sensor. Refer to Fuel Level Sensor Replacement in Engine Controls-3.8L or to Fuel Level Sensor Replacement in Engine Controls-5.7L.

Did you complete the replacement?

--

Go to Step 12

--

11

Important

Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls-3.8L or to Powertrain Control Module (PCM) Replacement in Engine Controls-5.7L.

Did you complete the replacement?

--

Go to Step 12

--

12

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK