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Home >> Chevrolet >> 2008 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> DTC P0464 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal C and ground.
    • If greater than the specified range, test the circuit for an open/high resistance. If the circuits tests normal, replace the ECM.
  3. Install a Signal Generator and Instrument Panel Tester between the fuel level sensor signal circuit terminal B and the low reference circuit terminal C.
  4. Ignition ON, vary the signal generator resistance between 40 and 250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 0.5 and 4.5 volts as the signal generator resistance changes.
    • If not displaying the specified range, test the circuit for an open/high resistance. If the circuit test normal, replace the ECM.
  5. If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor.
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