Pinpoint Test Ax: DTC U3003:16 (GPSM)

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 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 & CABLES -- FUSION, MILAN & MKZ article.

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.
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?
- Yes : REFER to CHARGING SYSTEM -- FUSION, MILAN & MKZ article.
- No : GO to AX3.
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 & CABLES -- FUSION, MILAN & MKZ article.
- Is the battery OK and fully charged?
- Yes : GO to AX4.
- No : REFER to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.
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, Circuit SBP14 (BN/RD), Harness Side And Ground
  Courtesy 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.
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, Circuit GD116 (BK/VT), Harness Side And Ground
  Courtesy 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.
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) - FUSION, MILAN or GLOBAL POSITIONING SYSTEM MODULE (GPSM) - MKZ in this service information. 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.