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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 2114 (Steering Column Switches - F-150 & Mark LT) >> 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 Lincoln Mark LT and 2007 Ford Pickup. 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. A1 CHECK FOR VOLTAGE AT THE CENTRAL JUNCTION BOX (CJB) FUSE 102 (20A) 
    • Disconnect: CJB Fuse 102 (20A)
    • Measure the voltage between CJB fuse cavity 102, input side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : VERIFY CJB fuse 102 (20A) is OK. If OK, go to  A2 .
    2. NO  : CHECK the CJB fuse cavity 102 input and output side for looseness, corrosion, dirt or damage. REPAIR or INSTALL a new CJB as necessary. TEST the system for normal operation.
  2. A2 CHECK CIRCUIT 1050 (LG/VT) FOR VOLTAGE  
    • Connect: CJB Fuse 102 (20A)
    • Disconnect: Ignition Switch C250
    • Measure the voltage between ignition switch C250-4, circuit 1050 (LG/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A3.
    2. NO  : Go to  A4.
  3. A3 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING.
    • Is the ignition switch OK? 
    1. YES  : Go to Pinpoint Test B .
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch  in this article. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN 
    • Disconnect: CJB C270g
    • Measure the resistance between ignition switch C250-4, circuit 1050 (LG/VT), harness side and CJB C270g-4, circuit 1050 (LG/VT), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new CJB. TEST the system for normal operation.
    2. NO  : REPAIR circuit 1050 (LG/VT). TEST the system for normal operation.
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