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Pinpoint Test P: No Power To The Scan Tool

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  1. P1 CHECK DLC PINS FOR DAMAGE 
    NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.
    • Disconnect the scan tool cable from the DLC.
    • Inspect DLC pins 4, 5 and 16 for damage.
      • Fig 1: Checking DLC Pins For Damage
      GF0001414Courtesy of FORD MOTOR CO.
    • Are DLC pins 4, 5 and 16 OK? 
    1. YES  : Go to  P2.
    2. NO  : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. P2 CHECK THE DLC VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Measure the voltage between the DLC C251-16, circuit 40 (LB/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  P3.
    2. NO  : VERIFY the central junction box (CJB) fuse 16 (10A) is OK. If OK, REPAIR the circuit. REPEAT the network test with the scan tool.
  3. P3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN 
    • Measure the resistance between the DLC C251-4, circuit 57 (BK), harness side and ground; and between the DLC C251-5, circuit 570 (BK/WH), harness side and ground.
    • Are the resistances less than 5 ohms? 
    1. YES  : REPAIR the scan tool. REPEAT the network test with the scan tool.
    2. NO  : REPAIR the circuit in question. REPEAT the network test with the scan tool.
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