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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC P2068 >> Test Description

Test Description

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

  1. 3:  This step tests for the proper operation of the circuit in the low voltage range.
DTC P2068

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View References: Instrument Panel, Gages, and Console Connector End Views , Powertrain Control Module (PCM) Connector End Views in Engine Controls - 4.3L or Powertrain Control Module (PCM) Connector End Views in Engine Controls - 4.8L, 5.3L, and 6.0L
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 Rear parameter in the powertrain control module (PCM) Enhanced EVAP data list.
Does the scan tool indicate that the Fuel Level Sensor Rear 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 C101.
  3. Connect a 3-ampere fused jumper wire between the signal circuit of the secondary fuel level sensor and the low reference circuit of the secondary fuel level sensor on the female terminal side of the connector.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the Fuel Level Sensor Rear parameter in the PCM Enhanced EVAP data list.
Does the scan tool indicate that the Fuel Level Sensor Rear parameter is less than the specified value?		 0.5 V Go to Step 6  Go to Step 4 
4 Test the signal circuit of the secondary fuel level sensor for an open, for a high resistance, or 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 12  Go to Step 5 
5 Test the low reference circuit of the secondary fuel level sensor for an open, for a high resistance, or 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 12  Go to Step 9 
6 Test the signal circuit of the secondary fuel level sensor for an open, for a high resistance, or for a short to voltage between C101 and the secondary fuel level sensor. Refer to Circuit Testing and 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 secondary fuel level sensor for an open, for a high resistance, or for a short to voltage between C101 and the secondary fuel level sensor. Refer to Circuit Testing and 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 secondary fuel level sensor. 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 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 Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the secondary fuel level sensor. Refer to:
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems 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.
Does the DTC reset?		 - Go to Step 2  System OK
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