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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 177 (Instrument Panel System Displays, Gauges And Console) >> Diagnostic Information and Procedures >> DTC P0463 >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  Tests for the proper operation of the circuit in the low voltage range.
DTC P0463

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views , Engine Controls Connector End Views for the 3.5L engine, Engine Controls Connector End Views for the 3.9L engine and Inline Harness Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Fuel Level Sensor parameter in the engine control module (ECM)/powertrain control module (PCM) evaporative emission (EVAP) data list.
Does the scan tool indicate that the Fuel Level Sensor parameter is greater than the specified value?		 4.5 V Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Disconnect C305.
  3. Connect a 3-amp fused jumper wire between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor (male terminal side).
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the Fuel Level Sensor parameter.
Does the scan tool indicate that the Fuel Level Sensor parameter is less than the specified value?		 0.4 V Go to Step 6  Go to Step 4 
4 Test the signal circuit of the fuel level sensor for the following:
  • An open
  • A high resistance
  • A short to voltage

Refer to Circuit Testing and Wiring Repairs .
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 the following:
  • An open
  • A high resistance
  • A short to voltage

Refer to Circuit Testing and Wiring Repairs .
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 the following between C305 and the fuel level sensor.
  • An open
  • A high resistance
  • A short to voltage

Refer to Circuit Testing and Wiring Repairs .
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 the following between C305 and the fuel level sensor.
  • An open
  • A high resistance
  • A short to voltage

Refer to Circuit Testing and Wiring Repairs .
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 Connector Repairs .
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 ECM/PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
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 for the 3.5L engine.
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the ECM/PCM. Refer to Control Module References for replacement, setup and programming.
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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