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Pinpoint Test H: The LTM Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2009 Ford Flex. 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. H1 CHECK THE LTM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: LTM  C4174b.
    • Ignition ON.
    • Measure the voltage between the LTM  C4174b-4, circuit SBB34 (YE/RD), harness side and ground; and between the LTM  C4174b-9, circuit SBP14 (BN/RD), harness side and ground.
      Fig 1: Measuring Voltage Between LTM C4174B-4 And Ground
      G06065459Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to H2.
    • No  : VERIFY the Battery Junction Box (BJB) fuse 34 (30A) and Smart Junction Box (SJB) fuse 14 (10A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the appropriate System Wiring Diagrams article to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. H2 CHECK THE LTM GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance between the LTM  C4174b-1, circuit GD149 (BK/GY), harness side and ground.
      Fig 2: Measuring Resistance Between LTM C4174B-1 And Ground
      G06065460Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H3.
    • No  : REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. H3 CHECK THE MS-CAN CIRCUITS BETWEEN THE LTM AND THE DLC FOR AN OPEN 
    • Measure the resistance between the LTM  C4174a-11, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC) C251-3, circuit VDB06 (GY/OG), harness side.
      Fig 3: Measuring Resistance Between LTM C4174A-11 And Data Link Connector (DLC) C251-3
      G06065461Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LTM  C4174a-10, circuit VDB07 (VT/OG), harness side and the DLC  C251-11, circuit VDB07 (VT/OG), harness side.
      Fig 4: Measuring Resistance Between LTM C4174A-10 And DLC C251-11
      G06065462Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : CONNECT the negative battery cable. GO to H4.
    • No  : REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. H4 CHECK FOR CORRECT LTM OPERATION 
    • Disconnect the LTM  connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the LTM  connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new LTM  . REFER to BODY CLOSURES . CLEAR the DTCs. REPEAT the network test with the scan tool.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
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