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Home >> Chevrolet >> 2006 >> Optra5 LT, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel, Gages, And Console >> Diagnostic Information and Procedures >> DTC P0462 (W/O Delphi Controller) >> Test Description

Test Description

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

  1. 2:  This step verifies that a condition exists.
  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 a short to ground or an open in the 5-volt reference circuit.
  3. 5:  This step tests for a condition in the signal circuit of the fuel level sensor. If the Fuel Level Voltage parameter does not display more than the specified voltage, test for a short to ground or an open in the signal circuit.
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 - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the Fuel Level Sensor voltage parameter with a scan tool.
Is the voltage less than the specified value?		 0.2 V Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  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 4  Go to Diagnostic Aids
4 
  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. Measure the voltage between the 5-volt reference circuit of the fuel level sensor and a good ground, with a DMM.
Is the voltage more than the specified value?		 4.8 V Go to Step 5  Go to Step 7 
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 6  Go to Step 8 
6 Test the signal circuit of the fuel level sensor for one of the following conditions:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
7 Test the 5-volt reference circuit of the fuel level sensor and all shared 5-volt reference circuits for one of the following conditions:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
8 Test for an intermittent and for a poor connection at the fuel sender assembly. 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 Test for an intermittent and for a poor connection at the engine control module (ECM). 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 sender assembly.
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the ECM.
Did you complete the replacement?		 - Go to Step 12  -
12
  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  System OK
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