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Pinpoint Test D: No Power In Start

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. D1 CHECK CIRCUIT CDC34 (WH/OG) FOR AN OPEN 
    NOTE: To access the SJB connector, the floor console must be removed.
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Disconnect: SJB C2280e
    • Disconnect: BJB Fuse 35 (10A)
    • Measure the resistance between:
      • ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280b-45 circuit CDC34 (WH/OG), harness side.
      • ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB C2280e-1 circuit CDC34 (WH/OG), harness side.
      • ignition switch C250-1, circuit CDC34 (WH/OG), harness side and BJB fuse 35 input side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D2.
    2. NO  : REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
  2. D2 CHECK CIRCUIT CDC34 (WH/OG) FOR A SHORT TO GROUND 
    • Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and ground.
      • Fig 1: Measuring Resistance
      GF0042511Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D3.
    2. NO  : REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
  3. D3 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN 
    • Disconnect: PCM C175b
    • For hybrid vehicles  , measure the resistance between ignition switch C250-7, circuit CDC35 (BU/WH), harness side and PCM C175b-21, circuit CDC35 (BU/WH), harness side.
      • Fig 2: Measuring Resistance
      GF0042512Courtesy of FORD MOTOR CO.
    • For non-hybrid vehicles  , measure the resistance between ignition switch C250-7, circuit CDC35 (BU/WH), harness side and PCM C175b-7, circuit CDC35 (BU/WH), harness side.
      • Fig 3: Measuring Resistance
      GF0042513Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D4.
    2. NO  : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
  4. D4 CHECK CIRCUIT CDC35 (BU/WH) FOR A SHORT TO GROUND 
    • Measure the resistance between ignition switch C250-7, circuit CDC35 (BU/WH), harness side and ground.
      • Fig 4: Measuring Resistance
      GF0042514Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D5.
    2. NO  : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
  5. D5 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch - Electrical Component Test. Refer to appropriate COMPONENT TESTING article.
    • Is the ignition switch OK? 
    1. YES  : Go to  D6.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.
  6. D6 CHECK FOR CORRECT SJB OPERATION 
    • Check SJB connectors C2280b and C2280e for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: SJB C2280b
    • Connect: SJB C2280e
    • Make sure the connectors are seated correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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