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Pinpoint Test O : B1318

  1. O1 RECHECK THE LTM DTCs

    • Ignition ON.
    • Using a scan tool, perform the LTM self-test.
    • Using a scan tool, clear the LTM DTCs.
    • Wait 10 seconds.
    • Repeat the LTM self-test.

    Is DTC B1318 still present? 

    Yes  GO to  O2.
    No  The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

  2. O2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

    • Using a scan tool, perform the PCM KOEO self-test.

    Are any charging system DTCs set in the PCM ? 

    Yes  REFER to Electronic Engine Controls .
    No  GO to  O3.

  3. O3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

    Is the battery OK and fully charged? 

    Yes  GO to  O4.
    No  CHARGE or INSTALL a new battery as necessary. REFER to Battery, Mounting and Cables .

  4. O4 CHECK THE LTM VOLTAGE (VBAT_#1) AND (VBAT_#2) PIDs

    • Ignition ON.
    • Measure and record the voltage at the battery.
    • Using a scan tool, view LTM PIDs.
    • Monitor the LTM voltage PIDs (VBAT_#1) and (VBAT_#2).

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

    Yes  GO to  O7.
    No  GO to  O5.

  5. O5 CHECK THE LTM VOLTAGE SUPPLY

    • Ignition OFF.
    • Disconnect: LTM C4174A.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174A-4
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground
      C4174A-9
      GFD33595Courtesy of FORD MOTOR COMPANY
      		 Ground

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

    Yes  GO to  O6.
    No  REPAIR the circuit in question for high resistance.

  6. O6 CHECK THE LTM GROUND CIRCUIT

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C4174A-1
      GFD33596Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  O7.
    No  REPAIR the circuit for high resistance.

  7. O7 CHECK FOR CORRECT LTM OPERATION

    • Ignition OFF.
    • Disconnect and inspect all LTM connectors.
    • Repair:
      • corrosion (install new connector 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. Make sure they seat and latch correctly.
    • Operate the system and determine if 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 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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