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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Fuel Gage Inaccurate or Inoperative (2.4L and 2.2L) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the fuel level sensor. Install a signal generator and instrument panel tester between the signal circuit and the low reference circuit.
  2. Ignition ON, vary the resistance on the signal generator from 40-250 ohms. With the scan tool verify that the Fuel Tank Level Remaining parameter displays the correct fuel level percent. Refer to Fuel Level Specifications (2.0L )  or Fuel Level Specifications (2.4L and 2.2L) .
    • If the fuel level percent is incorrect, test the signal circuit and the low reference circuit for an open/high resistance. If all circuit tests normal, replace the ECM.
  3. Ignition ON, vary the resistance on the signal generator from 40-250 ohms. Observe the fuel gage and verify that the fuel gage displays the correct fuel level. Refer to Fuel Level Specifications (2.0L )  or Fuel Level Specifications (2.4L and 2.2L) .
    • If the fuel gage display is incorrect, test or replace the instrument panel cluster (IPC).
  4. If all circuits test normal, test or replace the fuel level sensor.
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