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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1916 (Instrument Panel System Displays & Gauges) >> Diagnostic Information and Procedures >> DTC P0464 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: If equipped, the following tests can be performed at an inline connector. See schematics for the corresponding terminals to test at.
  1. Ignition OFF, disconnect the harness connector at the primary fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm between the primary fuel level sensor low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, install a signal generator and instrument panel tester between the primary fuel level sensor signal circuit terminal 4 and the low reference circuit terminal 3.
  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 5 and 95 percent as the signal generator resistance changes.
    • If not displaying the specified range, test the signal circuit terminal 1 for an open/high resistance. If the circuit tests normal, replace the ECM
  5. If all circuits test normal, perform the fuel level sensor component test before replacing the primary fuel level sensor.
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