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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1108 (Steering Column Switches) >> Diagnostic Tests >> Steering Column Switches >> Pinpoint Tests >> Pinpoint Test A: The Ignition Switch is Inoperative >> Pinpoint Test A: The Ignition Switch Is Inoperative

Pinpoint Test A: The Ignition Switch Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 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 multimeter probes.
  1. A1 CHECK THE IGNITION SWITCH FOR POWER. 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250
      • Fig 1: Checking Circuit For Voltage
      GF0025614Courtesy of FORD MOTOR CO.
    • Measure the voltage between ignition switch C250-4, circuit 1715 (RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A2.
    2. NO  : VERIFY BJB fuse 1 (50A) and SJB fuse 4 (10A) are OK. If OK, go to  A3 .
  2. A2 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING article.
    • Is the ignition switch OK? 
    1. YES  : Go to  A4.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTCs. REPEAT the self-test.
  3. A3 CHECK CIRCUIT 1715 (RD) FOR AN OPEN 
    • Disconnect: SJB C2280a
      • Fig 2: Checking Circuit For Open
      GF0025615Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-4 circuit 1715 (RD), harness side and SJB C2280a-6 circuit 1715 (RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR circuit 1715 (RD). CLEAR the DTCs. REPEAT the self-test.
  4. A4 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect all the SJB connectors and make sure they seat correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article.
    2. 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.
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