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Home >> Cadillac >> 2005 >> XLR >> 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 number below refers to the step number on the diagnostic table.

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

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Engine Controls Connector End Views in Engine Controls or Inline Harness Connector End Views in Wiring Systems
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 Right Tank parameter in the engine control module (ECM) evaporative emission (EVAP) data list.
Does the scan tool indicate that the Fuel Level Sensor Right Tank 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 C420.
  3. Connect a 3-amp 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 male terminal side of the connector.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the Fuel Level Sensor Right Tank parameter.
Does the scan tool indicate that the Fuel Level Sensor Right Tank 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 the following:
  • An open
  • A high resistance
  • 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 or for a high resistance. 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 the following between C101 and the secondary fuel level sensor.
  • An open
  • A high resistance
  • 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 7 
7 Test the low reference circuit of the secondary fuel level sensor for an open, or for a high resistance 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 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 12  Go to Step 11 
10 Replace the secondary sender module. Refer to Fuel Tank Module Replacement - Right in Engine Controls.
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the ECM. 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 as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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