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PINPOINT TEST G: DTCs U3003:16 AND 17

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 RETRIEVE PCM DTCs 
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: Self-Test - PCM.

    Are any charging system DTCs present in the PCM? 

    1. Yes  : REFER to CHARGING SYSTEM for diagnosis of the battery and charging system.
    2. No  : GO to G2  .
  2. G2 CHECK BATTERY CONDITION 

    Does the battery pass the condition test? 

    1. Yes  : If the battery passed the condition test but required a recharge, REFER to CHARGING SYSTEM to diagnose the charging system. CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs). TEST the system for normal operation. If the battery passed the condition test and did not require a recharge, GO to G3  .
    2. No  : INSTALL a new battery. CLEAR all CMDTCs  . TEST the system for normal operation.
  3. G3 CHECK THE CHARGING SYSTEM VOLTAGE 
    NOTE: Do not allow the engine rpm to exceed 2, 000 rpm while carrying out this step or the generator may self-excite, resulting in default charging system output voltage. If engine rpm has exceeded 2, 000 rpm, shut the vehicle off and restart the engine before carrying out this step.
    • Start the engine.
    • Measure the voltage of the battery:
      • For DTC U3003:17,  turn off all accessories and run the engine at 1, 500 rpm for a minimum of 2 minutes.
      • For DTC U3003:16,  turn on headlights and HVAC fan on high and run engine at 1, 500 rpm for a minimum of 2 minutes.
        Fig 1: Checking Charging System Voltage
        G06544266Courtesy of FORD MOTOR CO.

    Is the battery voltage between 13-15.2 volts? 

    1. Yes  : For DTC U3003:16,  GO to G4  .

      For DTC U3003:17,  INSTALL a new HVAC module. REFER to CLIMATE CONTROL . CLEAR all CMDTCs  . REPEAT the self-test.

    2. No  : REFER to CHARGING SYSTEM to diagnose the charging system. CLEAR all CMDTCs  . TEST the system for normal operation.
  4. G4 CHECK THE HVAC MODULE VOLTAGE SUPPLY CIRCUIT FOR HIGH RESISTANCE 
    • Ignition OFF.
    • Disconnect: HVAC Module - EMTC  C2357.
    • Disconnect: HVAC Module - DATC  C228A.
    • Ignition ON.
    • With the engine running, measure the voltage between ground and:
      • For EMTC systems,  HVAC Module - EMTC C2357-26  , circuit SBP46 (BN/RD), harness side.
      • For DATC systems,  HVAC module - DATC C228A-26  , circuit SBP46 (BN/RD), harness side.
        Fig 2: Checking HVAC Module Voltage Supply Circuit For High Resistance
        G09297349Courtesy of FORD MOTOR CO.

    Is the voltage greater than 10 volts? 

    1. Yes  : GO to G5  .
    2. No  : REPAIR circuit SBP46 (BN/RD) for high resistance. CLEAR all CMDTCs  . REPEAT the self-test.
  5. G5 CHECK THE HVAC MODULE GROUND CIRCUIT FOR HIGH RESISTANCE 
    • Ignition OFF.
    • Measure the resistance between ground and:
      • For EMTC systems,  HVAC Module - EMTC C2357-10  , circuit GD115 (BK/GY), harness side.
      • For DATC systems,  HVAC module - DATC C228A-10  , circuit GD115 (BK/GY), harness side.
        Fig 3: Checking HVAC Module Ground Circuit For High Resistance
        G09297350Courtesy of FORD MOTOR CO.

    Is the resistance less than 5 ohms? 

    1. Yes  : GO to G6  .
    2. No  : REPAIR circuit GD115 (BK/GY) for high resistance. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. G6 CHECK THE HVAC MODULE CONNECTION 
    • Inspect the HVAC module component and harness side connectors for:
      • corrosion
      • damaged pins
      • pushed-out terminals
    • Connect and correctly seat all the HVAC module connectors.
    • Clear the DTCs.
    • Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    1. Yes  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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