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Home >> Chevrolet >> 2006 >> HHR LS, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC P0464 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect C401, 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 and monitor the fuel gage.
    • If the fuel gage displays the correct fuel level, test the signal circuit for an open/high resistance between C401 and the fuel level sender. If the circuit tests normal, test the low reference circuit for an open/high resistance between C401 and the fuel level sender.
    • If all circuits test normal, replace the fuel level sender.
  3. Ignition ON, vary the resistance on the signal generator from 40-250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays the correct fuel level percent.
    • If the fuel level percent is correct, replace the instrument panel cluster (IPC).
    • If the fuel level percent is incorrect, test the signal circuit for an open/high resistance. If the circuit tests normal, test the low reference circuit for an open/high resistance.
    • If all circuits test normal, replace the ECM.
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