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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2825 (Steering Column Switches -- F250-F550 Super Duty) >> Diagnosis And Testing >> Steering Column Switches >> Pinpoint Tests >> Pinpoint Test F: DTCs B2844 and U2472 - Ignition Fault and Unexpected Ignition State >> PINPOINT TEST F: DTCs B2844 AND U2472 - IGNITION FAULT AND UNEXPECTED IGNITION STATE

PINPOINT TEST F: DTCs B2844 AND U2472 - IGNITION FAULT AND UNEXPECTED IGNITION STATE

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
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. F1 CHECK THE IGNITION SWITCH 
    • Yes:  For DTC U2472, GO to F2  .

      For DTC B2844, GO to F4  .

    • No:  INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test.
  2. F2 CHECK CIRCUIT CDC33 (VT/GN) FOR AN OPEN 
    • Disconnect: Ignition Switch C250.
    • Disconnect: SJB  C2280A.
    • Measure the resistance between ignition switch C250-5, circuit CDC33 (VT/GN), harness side and SJB  C2280A-3, circuit CDC33 (VT/GN), harness side.
      Fig 1: Measuring Resistance Between Ignition Switch C250-5, And SJB C2280A-3
      G06126033Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to F3  .
    • No:  REPAIR circuit CDC33 (VT/GN). CLEAR the DTCs. REPEAT the self-test.
  3. F3 CHECK CIRCUIT CDC34 (WH/OG) FOR AN OPEN 
    • Disconnect: SJB  C2280B.
    • Measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB  C2280B-45, circuit CDC34 (WH/OG), harness side.
      Fig 2: Measuring Resistance Between Ignition Switch C250-1 And SJB C2280B-45
      G06762832Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to F6  .
    • No:  REPAIR circuit CDC34 (WH/OG). CLEAR the DTCs. REPEAT the self-test.
  4. F4 CHECK THE IGNITION CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: One-Touch Integrated Start (OTIS) Diode.
    • Disconnect: Ignition Switch C250 (all vehicles).
    • Disconnect: SJB  C2280A (all vehicles).
    • Disconnect: SJB  C2280B (all vehicles).
    • Disconnect: SJB  C2280E (all vehicles).
    • Disconnect: PCM C1232B (diesel).
    • Disconnect: PCM C175T (gasoline only).
    • Measure the voltage between ground and:
      • SJB  C2280A-3, circuit CDC33 (VT/GN), harness side.
      • SJB  C2280A-4, circuit CDC32 (BN/YE), harness side.
      • SJB  C2280B-45, circuit CDC34 (WH/OG), harness side.
      • SJB  C2280E-8, circuit CDC38 (WH/VT), harness side.
    • Is any voltage present? 
    • Yes:  REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to F5  .
  5. F5 CHECK THE IGNITION CIRCUITS FOR AN OPEN 
    • For all vehicles  , measure the resistance between ignition switch C250-1, circuit CDC34 (WH/OG), harness side and SJB  C2280B-45, circuit CDC34 (WH/OG), harness side.
      Fig 3: Measuring Resistance Between Ignition Switch C250-1 And SJB C2280B-45
      G06762832Courtesy of FORD MOTOR CO.
    • For all vehicles  , measure the resistance between ignition switch C250-5, circuit CDC33 (VT/GN), harness side and SJB  C2280A-3, circuit CDC33 (VT/GN), harness side.
      Fig 4: Measuring Resistance Between Ignition Switch C250-5 And SJB C2280A-3
      G06126033Courtesy of FORD MOTOR CO.
    • For diesel engine vehicles without OTIS  , measure the resistance between ignition switch C250-10, circuit CDC35 (BU/WH), harness side and SJB  C2280E-8, circuit CDC38 (WH/VT), harness side.
      Fig 5: Measuring Resistance Between Ignition Switch C250-10 And SJB C2280E-8
      G06762868Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250-10, circuit CDC35 (BU/WH), harness side and the OTIS  diode, input side.
      Fig 6: Measuring Resistance Between Ignition Switch C250-10, Circuit CDC35 (BU/WH) And OTIS Diode, Input Side
      G06762869Courtesy of FORD MOTOR CO.
    • Measure the resistance between OTIS  diode, output side and SJB  C2280E-8, circuit CDC38 (WH/VT), harness side.
      Fig 7: Measuring Resistance Between OTIS Diode, Output Side And SJB C2280E-8, Circuit CDC38 (WH/VT)
      G06762870Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  For vehicles equipped with OTIS  , GO to F6  .

      For vehicles not equipped with OTIS  , GO to F7  .

    • No:  REPAIR the affected circuit(s). CLEAR the DTCs  . REPEAT the self-test.
  6. F6 CHECK THE OTIS DIODE FOR A SHORT OR AN OPEN 
    • NOTE: The diode should only have continuity in one direction.
    • Using the diode setting on the Fluke 77-IV Digital Multimeter, test the diode.
    • Is the diode OK? 
    • Yes:  GO to F7  .
    • No:  INSTALL a new OTIS  diode. CLEAR the DTCs. REPEAT the self-test.
  7. F7 CHECK THE SJB CONNECTORS 
    • Check SJB  connectors C2280A, C2280B and C2280E for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: SJB  C2280A (all vehicles).
    • Connect: SJB  C2280B (all vehicles).
    • Connect: SJB  C2280E (all vehicles).
    • Connect: PCM C1232B (diesel with OTIS  ).
    • Connect: PCM C175T (gasoline only).
    • Connect: Ignition Switch C250 (all vehicles).
    • Connect: Run/Start Relay (all vehicles).
    • Connect: OTIS  Diode (diesel and all gasoline vehicles).
    • Make sure the connectors are seated correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test.
    • No:  The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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