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Pinpoint Test L : B1318

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. L1 RECHECK THE LTM DTCs

    • Ignition ON.
    • Using a diagnostic scan tool, clear the DTCs and then repeat the LTM self-test.

    Is DTC B1318 still present? 

    Yes  GO to  L2.
    No  The system is operating normally at this time. The DTC may have been set due to a previous low battery voltage condition.

  2. L2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

    • Using a diagnostic scan tool, carry out the PCM KOEO self-test and KOER.
    • Using a diagnostic scan tool, retrieve the continuous memory DTCs from the PCM.

    Are any voltage or charging system related DTCs present in the PCM ? 

    Yes  DIAGNOSE the charging system. REFER to Charging System .
    No  GO to  L3.

  3. L3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

    • Ignition OFF.

    Is the battery OK and fully charged? 

    Yes  GO to  L4.
    No  REFER to Battery, Mounting and Cables .

  4. L4 CHECK THE LTM VOLTAGE PIDs

    • Ignition ON.
    • Measure and record the voltage at the battery.
    • Using a diagnostic scan tool, monitor the LTM PIDs as follows:
      • Battery Voltage #1 Data (VBAT_1)
      • Battery Voltage #2 Data (VBAT_2)

    Are the voltages within 0.2 volt of the recorded battery voltage? 

    Yes  GO to  L7.
    No  GO to  L5.

  5. L5 CHECK THE LTM VOLTAGE SUPPLY CIRCUITS FOR HIGH RESISTANCE

    • Ignition OFF.
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174A-4
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174A-9
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages within 0.2 volt of the recorded battery voltage? 

    Yes  GO to  L6.
    No  REPAIR the circuit in question for high resistance.

  6. L6 CHECK THE LTM GROUND CIRCUIT FOR HIGH RESISTANCE

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174A-1
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  L7.
    No  REPAIR the circuit.

  7. L7 CHECK FOR CORRECT LTM OPERATION

    • Disconnect all the LTM connectors.
    • Check for:
      • corrosion (install new connectors or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect all the LTM connectors and make sure they seat and latch correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new LTM. REFER to Liftgate/Trunk Module (LTM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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