Pinpoint Test L: No Power To The Scan Tool

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

L1 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
  Courtesy of FORD MOTOR CO.
- Are DLC pins 4, 5 and 16 OK?
1. YES : Go to L2.
2. NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
L2 CHECK THE VOLTAGE TO THE SCAN TOOL CIRCUIT 40 (LB/WH)
- 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 L3.
2. NO : VERIFY the central junction box (CJB) fuse 12 (20A) is OK. If OK, REPAIR the circuit. REPEAT the network test with the scan tool.
L3 CHECK THE DLC GROUND CIRCUITS 57 (BK) AND 570 (BK/WH)
- Measure the resistance between the DLC C251-4, circuit 1205 (BK), harness side and ground; and between the DLC C251-5, circuit 1203 (BK/LB), 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.