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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1441 (Instrument Panel, Gages, And Console) >> Diagnostic Information and Procedures >> DTC P0463: Fuel Level Signal High >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  Tests for the proper operation of the circuit in the high 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 Level parameter in the Powertrain Fuel and Emissions list.
Does the scan tool indicate that the Fuel Level parameter is greater than the specified value?		 12 Gallons Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn the ignition OFF.
  2. Disconnect C406.
  3. Turn the ignition ON, with the engine OFF.
  4. With a scan tool, observe the Fuel Level parameter.
Does the scan tool indicate that the Fuel Level parameter is less than the specified value?		 2 Gallons Go to Step 5  Go to Step 4 
4 Test the signal circuit of the fuel level sender for an open, for a high resistance, or for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
5 Test the signal circuit of the fuel level sender for an open, for a high resistance, or for a short to ground between C406 and the fuel level senders. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the fuel level senders. 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 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the engine control module (ECM). 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 10  Go to Step 9 
8 Replace the malfunctioning fuel level sender that has an internal open, abnormally high resistance, or a short to voltage. Refer to FUEL LEVEL SENDER UNIT & FLOAT .
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Program the replacement ECM.
Replace the ECM. Refer to ENGINE CONTROL MODULE .Did you complete the replacement?		 - Go to Step 10  -
10
  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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