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Home >> Chevrolet >> 2004 >> Epica LS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel, Gages, And Console >> Diagnostic Information and Procedures >> DTC P0461 (2.5L - LBK) >> Test Description

Test Description

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

  1. 3:  This step tests the signal circuit for a short to voltage. If the scan tool displays a voltage after the fuel sender assembly harness connector is disconnected, the circuit is shorted to a voltage.
  2. 4:  This step tests for a condition in the 5-volt reference circuit of the fuel level sensor. If the DMM does not display more than the specified voltage, test for an open or for a high resistance in the 5-volt reference circuit.
  3. 5:  If the Fuel Level Voltage parameter does not display more than the specified voltage, test for an open, or for a high resistance in the signal circuit.
  4. 10:  Inspect the fuel sender assembly harness connector, internally and externally, for water intrusion, corrosion, and bent or damaged terminals.
  5. 11:  Inspect the ECM connectors for water intrusion, corrosion, and bent or damaged terminals.
Step Action Value Yes No
Schematic Reference:  Instrument Cluster Schematics  
Connector End View Reference:  Instrument Panel, Gages, and Console Connector End Views  
1 Did you perform the Diagnostic System Check - in Instrument Cluster? - Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC Info with a scan tool.
Is DTC P0462 or P0463 also set?		 - Go to Diagnostic Trouble Code (DTC) List  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the fuel sender assembly harness connector through the access panel under the rear seat.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the Fuel Level Sensor voltage parameter with a scan tool.
Is the voltage less than the specified value?		 0.02 V Go to Step 4  Go to Step 6 
4 
    IMPORTANT: Use the J 35616-200  Test Lamp Kit for this test. If the J 35616-200  is not available, use a test lamp that measures more than 20 ohms.
  1. Connect a test lamp between the 5-volt reference circuit of the fuel level sensor and a good ground.
  2. Connect a DMM to the probe of the test lamp and a good ground. Refer to Measuring Voltage Drop in Wiring Systems.
Is the voltage more than the specified value?		 4.8 V Go to Step 5  Go to Step 8 
5 
  1. Connect a 3-amp fused jumper wire between the 5-volt reference circuit and signal circuit of fuel level sensor.
  2. Observe the fuel level sensor voltage parameter with a scan tool.
Is the voltage less than the specified value?		 4.8 V Go to Step 7  Go to Step 9 
6 Test the signal circuit of the fuel level sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
7 Test the signal circuit of the fuel level sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
8 Test the 5-volt reference circuit of the fuel level sensor a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
9
  1. Remove the Fuel Sender Assembly. Refer to Fuel Sender Assembly Replacement in Engine Controls - 2.5L.
  2. Inspect for the following:
    • A stuck Fuel Level sensor (i.e. the fuel strainer interfering with the sender float arm.)
    • Foreign material in the fuel tank (ice)
    • A fuel tank that is deformed or damaged
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
10  Test for shorted terminals and poor connections at the fuel sender assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 12 
11  Test for shorted terminals and poor connections at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
12 Replace the fuel sender assembly. Refer to Fuel Sender Assembly Replacement in Engine Controls - 2.5L.
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the ECM. Refer to Engine Control Module (ECM) Replacement in Engine Controls - 2.5L.
Did you complete the replacement?		 - Go to Step 14  -
14
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 15 
15 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.5L System OK
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