Pinpoint Test C: No Power In Run

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.

C1 CHECK CIRCUIT CDC34 (WH/OG) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Smart Junction Box (SJB) C2280b.
- Key in ON position.
- Measure the voltage between SJB C2280b-29, circuit CDC34 (WH/OG), harness side and ground.
  
  Fig 1: Checking Circuit CDC34 (WH/OG) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to C3.

No : GO to C2.
C2 CHECK CIRCUIT CDC34 (WH/OG) FOR AN OPEN OR SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280b.
- Disconnect: Ignition Switch C250.
- Measure the resistance between:
  - Ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280b-29, circuit CDC34 (WH/OG), harness side.
  - Ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
    
    Fig 2: Checking Circuit CDC34 (WH/OG) 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 ignition switch and ground?
Yes : GO to C3.

No : REPAIR the circuit. TEST the system for normal operation.
C3 CHECK THE IGNITION SWITCH
- Disconnect: Ignition Switch C250.
- Carry out the Ignition Switch Component Test. Refer to IGNITION SWITCH for component testing.
- Is the ignition switch OK?
Yes : GO to C4.

No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test.
C4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all 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.