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Pinpoint Test Ac: U3003:17

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.

    Normal Operation and Fault Conditions 

    The modules monitor the supplied voltage and set a DTC if it rises above a threshold.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    HVAC U3003:17 Battery Voltage: Circuit Voltage Above Threshold Sets in continuous memory and during the on-demand self-test when the HVAC control module detects the supply voltage is greater than 16 volts. This DTC may also set in the HVAC control module due to battery charging or vehicle jump starting events.

    Possible Sources 

    • Charging system concern
    • HVAC control module

    NOTE: Diagnostic Trouble Code (DTC) U3003:17 may be stored in the module memory due to past battery charging or vehicle jump starting events.

  2. AC1 CHECK FOR HIGH VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS) SET IN OTHER MODULES

    • Ignition ON.

    • Using a diagnostic scan tool, retrieve the Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any charging or over-voltage related voltage Diagnostic Trouble Codes (DTCs) present in multiple modules? 

    Yes  DIAGNOSE the charging system concern. REFER to: Charging System - 2.3L EcoBoost (199kW/270PS) . REFER to: Charging System - 2.7L EcoBoost (238kW/324PS) .
    No  GO to  AC2

  3. AC2 CHECK THE BATTERY VOLTAGE WITH THE ENGINE RUNNING

    • Turn off all interior/exterior lights and accessories.

    • Start the vehicle and monitor the battery voltage for 3 minutes.

    Does the battery voltage rise to 15.5 volts or higher? 

    Yes  DIAGNOSE the overcharging condition. REFER to: Charging System - 2.3L EcoBoost (199kW/270PS) . REFER to: Charging System - 2.7L EcoBoost (238kW/324PS) .
    No  GO to  AC3

  4. AC3 RECHECK FOR THE HIGH VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE)

    • Ignition OFF.

    • Ignition ON.

    • Using a diagnostic scan tool, clear the DTC for the suspect module.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, carry out the self-test for the suspect module setting the high voltage DTC.

    Is DTC U3003:17 still present? 

    Yes  For the HVAC control module, GO to  AC4
    No  The system is operating correctly at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

  5. AC4 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

    • Ignition OFF.

    • Disconnect and inspect all HVAC control module electrical connectors.

    • Repair:

      • corrosion (install new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary

    • Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly. WAIT 20 seconds for the range calibration to be executed after reconnecting of the module before any further assessment or measurement is made. If the actuator range calibration does not start, or has been interrupted, carry out the HVAC Calibration Routine, using a diagnostic scan tool.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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