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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel, Gages, And Console >> Diagnostic Information & Procedures >> DTC P0463: Fuel Level Signal High >> Test Description

Test Description

The number below refers to the step number on the diagnostic table. See DTC P0463 .

  1. 3:  Tests for the proper operation of the circuit in the low voltage range.

DTC P0463

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics 
1 Did you perform the Instrument Cluster 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 Enhanced 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 the ignition OFF.
  2. Disconnect C106.
  3. Connect a 3-ampere fused jumper wire between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side of the connector.
  4. Turn the ignition ON, with the engine OFF.
  5. With a scan tool, clear the DTCs.
  6. 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?		 4% 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 C106 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 C106 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 Conditions 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 Conditions 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 .
Did you complete the replacement?		 - Go to Step 12  -
11
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to POWERTRAIN CONTROL MODULE .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
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