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Pinpoint Test Ax: DTC U3003:16 (GPSM)

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .
  1. AX1 RECHECK THE GPSM DTCs 
    • Clear the GPSM  DTCs.
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 15 seconds.
    • Repeat the GPSM  self-test.
    • Is DTC U3003:16 still present? 
    • Yes  : GO to  AX2.
    • No  : The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.
  2. AX2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM 
    • Retrieve the continuous memory DTCs from all modules.
    • Is DTC P0620, P0622, P0625, or P065B set in the PCM? 
  3. AX3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE 
    • Check the battery condition and verify that the battery is fully charged. Refer to BATTERY, MOUNTING AND CABLES .
    • Is the battery OK and fully charged? 
  4. AX4 CHECK THE GPSM VOLTAGE SUPPLY 
    • Ignition OFF.
    • Measure and record the voltage at the battery.
    • Disconnect: GPSM  C2300.
    • Ignition ON.
    • Measure the voltage between the GPSM  C2300-1, circuit SBP14 (BN/RD), harness side and ground.
      Fig 1: Measuring Voltage Between GPSM C2300-1 And Ground
      G06254399Courtesy of FORD MOTOR CO.
    • Is the voltage within 0.2 volt of the recorded battery voltage? 
    • Yes  : GO to  AX5.
    • No  : REPAIR the circuit in question for high resistance. CLEAR the DTC. REPEAT the self-test.
  5. AX5 CHECK THE GPSM GROUND CIRCUITS 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the GPSM  C2300-6, circuit GD116 (BK/VT), harness side and ground.
      Fig 2: Measuring Resistance Between GPSM C2300-6 And Ground
      G06254400Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  AX6.
    • No  : REPAIR the circuit in question for high resistance. TEST the system for normal operation.
  6. AX6 CHECK FOR CORRECT GPSM OPERATION 
    • Disconnect the GPSM  connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the GPSM  connector and make sure it seats correctly.
    • Is the concern still present? 
    • Yes  : INSTALL a new GPSM  . REFER to GLOBAL POSITIONING SYSTEM MODULE (GPSM) . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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