Pinpoint Test D: No Power In Start

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 CHECK CIRCUIT CDC35 (BU/WH) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Smart Junction Box (SJB) C2280b.
- Key in START position.
- Measure the voltage between SJB C2280b-30, circuit CDC35 (BU/WH), harness side and ground while turning the key to the crank position.
  
  Fig 1: Checking Circuit CDC35 (BU/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to D3.

No : GO to D2.
D2 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
  - Ignition switch C250-7, circuit CDC35 (BU/WH), harness side and SJB C2280b-30, circuit CDC35 (BU/WH), harness side.
  - SJB C2280b-30, circuit CDC35 (BU/WH), harness side and ground.
    
    Fig 2: Checking Circuit CDC35 (BU/WH) For Open Or Short To Ground
    Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms between the ignition switch and the SJB, and greater than 10,000 ohms between the SJB and ground?
Yes : GO to D3.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
D3 CHECK FOR CORRECT SJB OPERATION
- Inspect the SJB connectors.
- Check for:
  - Corrosion.
  - Pushed-out pins.
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES .

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 self-test.