Pinpoint Test AF: No Power To The Scan Tool

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING & CABLES -- FUSION, MILAN & MKZ article.

AF1 CHECK THE 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
  Courtesy of FORD MOTOR CO.
- Are DLC pins 4, 5 and 16 OK?
1. Yes : GO to AF2 .
2. No : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
AF2 CHECK THE DLC VOLTAGE SUPPLY FOR AN OPEN
- Measure the voltage between the DLC C251-16, circuit SBP20 (GN/ RD), harness side and ground.
  
  Fig 2: Measuring Voltage Between DLC C251-16, Circuit SBP20 (GN/RD) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. Yes : GO to AF3 .
2. No : VERIFY the Smart Junction Box (SJB) fuse 20 (15A) is OK. If OK, REPAIR the circuit. REPEAT the network test with the scan tool.
AF3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-4, circuit GD116 (BK/ VT), harness side and ground; and between the DLC C251-5, circuit GD116 (BK/VT), harness side and ground.
  
  Fig 3: Measuring Resistance Between DLC C251-4, Circuit GD116 (BK/VT) Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
1. Yes : CONNECT the negative battery cable. REPAIR the scan tool. REPEAT the network test with the scan tool.
2. No : CONNECT the negative battery cable. REPAIR the circuit in question. REPEAT the network test with the scan tool.