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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0201-P0208 >> Circuit/System Testing
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Circuit/System Testing

  1. Remove the engine sight shield.
  2. Disconnect the fuel injector.
  3. With the ignition ON, engine OFF, probe the ignition 1 voltage circuit of the fuel injector with a test lamp that is connected to a good ground. The test lamp should illuminate.
    • If the test lamp does not illuminate, repair the open or the high resistance in the ignition 1 voltage circuit.
  4. Connect the Injector Test Lamp into the fuel injector connector. Start the engine.
    • If the test lamp flashes, test for an intermittent or a poor connection at the fuel injector, or a faulty fuel injector.
    • If the test lamp does not flash, test for an open, high resistance, or a short to voltage in the control circuit of the fuel injector, an intermittent or poor connection at the engine control module (ECM), or a faulty ECM.
    • If the test lamp remains illuminated at all times, test for a short to ground in the control circuit of the fuel injector, or a faulty ECM.
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