Pinpoint Test C: DTC B1318

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 DISCONNECT .

C1 RECHECK THE DDM DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DDM Self-Test.
- Clear the DTCs. Repeat the DDM self-test.
- Is DTC B1318 still present?
- Yes: GO to C2.
- No: The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.
C2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM
- Enter the following diagnostic mode on the scan tool: PCM Self-Test.
- Retrieve the continuous memory DTCs from the PCM.
- Is DTC P0620, P0625, P0626 or P065B set in the PCM?
- Yes: REFER to DIAGNOSTIC TROUBLE CODE (DTC) TABLE .
- No: GO to C3.
C3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Ignition OFF.
- Check the battery condition and verify the battery is fully charged. Refer to PINPOINT TEST A: BATTERY CONDITION TEST .
- Is the battery OK and fully charged?
- Yes: GO to C4.
- No: REFER to CHARGING SYSTEM .
C4 CHECK THE DDM VOLTAGE SUPPLY
- Measure and record the voltage at the battery.
- Disconnect: DDM C568b.
- Ignition ON.
- Measure the voltage between the DDM C568b-1, circuit SBP12 (GN/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between DDM C568b-1, Circuit SBP12 (GN/RD) & Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage within 0.2 volt of the recorded battery voltage?
- Yes: GO to C5.
- No: REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
C5 CHECK THE DDM GROUND CIRCUIT
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DDM C568b-24, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 2: Measuring Resistance Between DDM C568b-24, Circuit GD126 (BK/WH) & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to C6.
- No: REPAIR the circuit for high resistance. TEST the system for normal operation.
C6 CHECK FOR CORRECT DDM OPERATION
- Connect: Negative Battery Cable.
- Disconnect the DDM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new DDM . REFER to Removal and Installation . 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.