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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 509 (Active Noise Cancellation System) >> Diagnostic Information and Procedures >> DTC B0560 >> Circuit/System Testing

Circuit/System Testing

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NOTE:

Diagnose any engine control module DTCs before performing this diagnostic.

  1. Ignition OFF, disconnect the X4 harness connector at the amplifier.
  2. Test for less than 10 Ω between the engine speed low signal circuit terminal 8 and ground.
    • If not within the specified range, test the circuit for an open/high resistance, or short to voltage. If the circuit tests normal replace the ECM.
  3. Engine running at 600 RPM, test for 275-325 Hz AC between the engine speed high signal circuit terminal 7 and ground.
    • If not within the specified range, test the circuit for a short to ground, open/high resistance, or short to voltage. If the circuit tests normal replace the ECM.
  4. If all circuits test normal, replace the amplifier.
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