LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1618 (Steering Column Switches) >> Diagnostic Tests >> Steering Column Switches >> Pinpoint Tests >> Pinpoint Test C: No Power in RUN/START Position

Pinpoint Test C: No Power in RUN/START Position

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Power Distribution for schematic and connector information.

Normal Operation 

When placed in the RUN position, the ignition switch provides fused battery voltage to the following circuits:

When placed in the START position, the ignition switch provides fused battery voltage to the following circuits:

This pinpoint test is intended to diagnose the following:

PINPOINT TEST C: NO POWER IN RUN/START POSITION 

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. C1 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch - Electrical under Component Tests .
    • Is the ignition switch OK? 
    1. YES  : Go to  C2.
    2. NO  : INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTC. TEST the system for normal operation.
  2. C2 CHECK CIRCUIT 296 (WH/VT) FOR AN OPEN 
    • Disconnect: CJB Fuse 5 (7.5A)
    • Disconnect: CJB Fuse 7 (10A)
    • Disconnect: CJB Fuse 9 (7.5A)
      • Fig 1: Checking Circuit
      GF0014273Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-5, circuit 296 (WH/VT), harness side and:
      • CJB fuse 5 (7.5A), circuit 296 (WH/VT), input side.
      • CJB fuse 7 (10A), circuit 296 (WH/VT), input side.
      • CJB fuse 9 (7.5A), circuit 296 (WH/VT), input side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : VERIFY CJB fuses 5 (7.5A), 7 (10A) and 9 (7.5A) are OK. If OK, REPAIR circuit 296 (WH/VT). TEST the system for normal operation.
  3. C3 CHECK CIRCUIT 296 (WH/VT) FOR A SHORT TO GROUND 
      Fig 2: Checking Circuit For Short To Ground
      GF0014274Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-5, circuit 296 (WH/VT), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR circuit 296 (WH/VT). TEST the system for normal operation.
  4. C4 CHECK CIRCUIT 687 (GY/YE) FOR AN OPEN 
    • Disconnect: CJB Fuse 11 (15A)
    • Disconnect: CJB Fuse 13 (10A)
    • Disconnect: CJB Fuse 15 (10A)
    • Disconnect: CJB Fuse 17 (10A)
      • Fig 3: Checking Circuit
      GF0014275Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-7, circuit 687 (GY/YE), harness side and:
      • CJB fuse 11 (15A), circuit 687 (GY/YE), input side.
      • CJB fuse 13 (10A), circuit 687 (GY/YE), input side.
      • CJB fuse 15 (10A), circuit 687 (GY/YE), input side.
      • CJB fuse 17 (10A), circuit 687 (GY/YE), input side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C5.
    2. NO  : VERIFY CJB fuses 11 (15A), 13 (10A), 15 (10A) and 17 (10A) are OK. If OK, REPAIR circuit 687 (GY/YE). TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 687 (GY/YE) FOR A SHORT TO GROUND 
      Fig 4: Checking Circuit For Short To Ground
      GF0014276Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-7, circuit 687 (GY/YE), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C6.
    2. NO  : REPAIR circuit 687 (GY/YE). TEST the system for normal operation.
  6. C6 CHECK CIRCUIT 1717 (VT/OG) FOR AN OPEN 
    • Disconnect: CJB Fuse 2 (10A)
    • Disconnect: CJB Fuse 4 (10A)
    • Disconnect: CJB Fuse 6 (10A)
    • Disconnect: CJB Fuse 8 (10A)
      • Fig 5: Measuring Resistance
      GF0047603Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-1, circuit 1717 (VT/OG), harness side and:
      • CJB fuse 2 (10A), circuit 1717 (VT/OG), input side.
      • CJB fuse 4 (10A), circuit 1717 (VT/OG), input side.
      • CJB fuse 6 (10A), circuit 1717 (VT/OG), input side.
      • CJB fuse 8 (10A), circuit 1717 (VT/OG), input side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C7.
    2. NO  : VERIFY CJB fuses 2 (10A), 4 (10A), 6 (10A) and 8 (10A) are OK. If OK, REPAIR circuit 1717 (VT/OG). TEST the system for normal operation.
  7. C7 CHECK CIRCUIT 1717 (VT/OG) FOR A SHORT TO GROUND 
      Fig 6: Checking Circuit For Short To Ground
      GF0014278Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-1, circuit 1717 (VT/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  C8.
    2. NO  : REPAIR circuit 1717 (VT/OG). TEST the system for normal operation.
  8. C8 CHECK CIRCUIT 1522 (DG) FOR AN OPEN 
    • Disconnect: CJB Fuse 1 (10A)
    • Disconnect: CJB Fuse 3 (10A)
      • Fig 7: Checking Circuit
      GF0014279Courtesy of FORD MOTOR CO.
    • Measure the resistance between the ignition switch C250-10, circuit 1522 (DG), harness side and:
      • CJB fuse 1 (10A), circuit 1522 (DG), input side.
      • CJB fuse 3 (10A), circuit 1522 (DG), input side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C9.
    2. NO  : VERIFY CJB fuse 1 (10A) and 3 (10A) are OK. If OK, REPAIR circuit 1522 (DG). CLEAR the DTCs. TEST the system for normal operation.
  9. C9 CHECK CIRCUIT 1522 (DG) FOR A SHORT TO GROUND 
      Fig 8: Checking Circuit For Short To Ground
      GF0014280Courtesy of FORD MOTOR CO.
    • Measure the resistance between the ignition switch C250-10, circuit 1522 (DG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : 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.
    2. NO  : REPAIR circuit 1522 (DG). CLEAR the DTCs. TEST the system for normal operation.
scientia non olet · About LEMON Manuals