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Home >> Cadillac >> 2015 >> CTS V, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges (Coupe) >> Diagnostic Information and Procedures >> DTC P0464: Fuel Level Sensor 1 >> Circuit/System Testing

Circuit/System Testing

NOTE:
  • Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
  • If equipped, the following tests can be performed at an inline connector. See schematics for the appropriate circuit terminals.
  1. Ignition OFF, disconnect the harness connectors at the fuel pump and sender assembly.
  2. Test for less than 1.0 Ω between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool ECM Secondary Fuel Level Sensor parameter is greater than 4.75 V.
    • If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Connect a 3 A fused jumper wire between the signal circuit terminal 1 and ground, verify the scan tool ECM Secondary Fuel Level Sensor parameter is less than 1 V.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the fuel pump and sender assembly.
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