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Pinpoint Test A : Poor Reception - Am/Fm

  1. A1 CHECK THE AUDIO SYSTEM RECEPTION

    • Operate the audio system in radio tuner AM/FM mode.
    • Check the reception with the engine running, and with the engine off.

    Does the poor reception only occur with the engine running? 

    Yes  GO to  A2.
    No  GO to  A4.

  2. A2 CHECK THE GENERATOR

    • Ignition OFF.
    • Disconnect the wiring harness from the generator voltage regulator.
    • Start the engine.
    • Operate the audio system in radio tuner AM/FM mode.

    Is the reception OK? 

    Yes  INSTALL a new generator. REFER to Charging System - 3.5L Ti-VCT, 3.7L Ti-VCT or REFER to Charging System - 2.0L GTDI. .
    No  GO to  A3.

  3. A3 CHECK THE IGNITION CIRCUITS

    • Ignition OFF.
    • Connect the wiring harness to the voltage regulator.
    • Visually inspect the engine compartment and make sure all ignition coils are correctly and securely connected, and that there are no visible cracks in the coil housings.
    • Inspect all the wiring harnesses and connectors for damaged insulation and loose or broken conditions.

    Are the ignition components OK? 

    Yes  USE a jumper cable to ground various parts of the vehicle to the frame (for example: engine, fenders, quarter panels, stone deflectors, air cleaner, body sheet metal). When the noise is eliminated, PROVIDE a permanent ground where necessary.
    No  REPAIR the ignition system as necessary.

  4. A4 CHECK THE ANTENNA ENABLE CIRCUIT

    • Ignition OFF.
    • Disconnect: Antenna.
    • Ignition ON.
    • Operate the audio system in radio tuner AM/FM mode.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C9021-2
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A7.
    No  GO to  A5.

  5. A5 CHECK THE ANTENNA ENABLE CIRCUIT FOR AN OPEN

    • Ignition OFF.
    • Disconnect: ACM C240A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C240A-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 C9021-2

    Is the resistance less than 3 ohms? 

    Yes  GO to  A6.
    No  REPAIR the circuit.

  6. A6 CHECK THE ANTENNA ENABLE CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C240A-2
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  A10.
    No  REPAIR the circuit.

  7. A7 CHECK THE AM/FM ANTENNA CABLE

    • Ignition OFF.
    • Disconnect: AM/FM Antenna In-Line Connection At RH Scuff Plate Trim Panel.
    • Disconnect: AM/FM Antenna Cable At ACM.
    • Measure the resistance of the rear ACM antenna cable core between the antenna and the front ACM antenna cable in-line connection; and between the rear ACM antenna cable core and shield.
    • Measure the resistance of the front ACM antenna cable core between the ACM and the rear ACM antenna cable in-line connection; and between the front AM/FM antenna cable core and shield.

    Is the resistance of each AM/FM antenna cable core less than 2 ohms, and the resistance between the core and shield of each ACM antenna cable greater than 10, 000 ohms? 

    Yes  GO to  A8.
    No  INSTALL a new front or rear AM/FM antenna cable. For the front antenna cable, REFER to Antenna Cable - Front . For the rear antenna cable, REFER to Antenna Cable - Rear .

  8. A8 ISOLATE THE ANTENNA

    • Connect: AM/FM Antenna In-Line Connection At RH Scuff Plate Trim Panel.
    • Connect: AM/FM Antenna Cable At ACM.
    • Install a new antenna. REFER to Antenna .
    • Operate the audio system in radio tuner AM/FM mode.

    Is the reception OK? 

    Yes  The concern was caused by an inoperative AM/FM antenna. The system is now operating correctly.
    No  GO to  A9.

  9. A9 ISOLATE THE ANTENNA CABLE

    • Ignition OFF.
    • Substitute each antenna cable by routing a new component. Do not remove the original antenna cable at this time.
    • Operate the audio system in radio tuner AM/FM mode.

    Is the reception OK? 

    Yes  INSTALL a new antenna cable for the inoperative cable. For the front antenna cable, REFER to Antenna Cable - Front . For the rear antenna cable, REFER to Antenna Cable - Rear .
    No  REMOVE the substitute antenna cable. GO to  A10.

  10. A10 CHECK FOR CORRECT ACM OPERATION

    • Ignition OFF.
    • Disconnect and inspect all ACM connectors.
    • Repair:
      • Corrosion (clean module pins or install new connectors or terminals)
      • Damaged or bent pins (install new terminals or pins)
      • Pushed-out pins (install new pins as necessary)
    • Reconnect the ACM connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new ACM. REFER to Audio Control Module (ACM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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