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Home >> Cadillac >> 2007 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P2068 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the secondary (right) fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuits tests normal, replace the ECM.
  3. Install a 3A fused jumper wire between the signal circuit and the low reference circuit of the secondary (right) fuel level sensor. With the scan tool, observe the Fuel Level Sensor Right Tank parameter and verify the parameter is less than 0.5 volt.
    • If greater than 0.5 volt, test the secondary (right) fuel level sensor signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the ECM.
  4. If all circuits tests normal, test or replace the fuel level sensor.
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