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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2501 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test P: Transmission Four Wheel Drive (4X4) Mode Select Switch Failure >> Pinpoint Test P: Transmission Four Wheel Drive (4X4) MSS Failure

Pinpoint Test P: Transmission Four Wheel Drive (4X4) MSS Failure

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.
  1. P1 CHECK THE MSS PIDs 
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - 4WD  Module.
    • Monitor each 4WD_SW PID while cycling through each MSS  position.
    • Does each MSS PID agree with each switch position? 
    • Yes:  No problem found.

      CLEAR the DTCs. GO to PINPOINT TEST O .

    • No:  GO to P2  .
  2. P2 CHECK MSS RESISTANCE VALUES 
    • Ignition OFF.
    • Disconnect: MSS  C284.
    • Measure the resistance between MSS  C284, terminals 2 and 3, component side, while rotating the switch through all positions. Refer to the following chart:
      RESISTANCE SPECIFICATIONS

      Mode Select Switch (MSS) Position Resistance
      4X4 Low 4X4 High 2-Wheel Drive (2WD)
      130 ohms 270 ohms 619 ohms
      Fig 1: Measuring Resistance Between MSS C284, Terminals 2 And 3, Component Side
      G06763031Courtesy of FORD MOTOR CO.
    • Are the resistance values within specification? 
    • Yes:  GO to P3  .
    • No:  INSTALL a new MSS  . REFER to MODE SELECT SWITCH (MSS) . CLEAR the DTCs. REPEAT the self-test.
  3. P3 CHECK MSS CIRCUITS CCF13 (WH/BU) AND RCF13 (WH/BN) FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: 4X4 Control Module C281A.
    • Disconnect: MSS  C284.
    • Measure the resistance between MSS  C284-2, circuit CCF13 (WH/BU) harness side and ground.
    • Measure the resistance between MSS  C284-3, circuit RCF13 (WH/BN) harness side and ground.
      Fig 2: Measuring Resistance Between MSS C284-3, Circuit RCF13 (WH/BN) Harness Side And Ground
      G06128010Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to P4  .
    • No:  REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  4. P4 CHECK MSS CIRCUITS CCF13 (WH/BU) AND RCF13 (WH/BN) FOR AN OPEN 
    • Measure the resistance between MSS  C284-2, circuit CCF13 (WH/BU) and 4X4 control module C281A-9, circuit CCF13 (WH/BU), harness side.
      Fig 3: Measuring Resistance Between MSS C284-2, Circuit CCF13 (WH/BU) And 4X4 Control Module C281A-9, Circuit CCF13 (WH/BU), Harness Side
      G06763033Courtesy of FORD MOTOR CO.
    • Measure the resistance between MSS  C284-3, RCF13 (WH/BN) and 4X4 control module C281A-2, circuit RCF13 (WH/BN), harness side.
      Fig 4: Measuring Resistance Between MSS C284-3, RCF13 (WH/BN) And 4X4 Control Module C281A-2, Circuit RCF13 (WH/BN), Harness Side
      G06763034Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to P5  .
    • No:  REPAIR the affected circuit(s). CONNECT the 4X4 control module. CLEAR the DTCs. REPEAT the self-test.
  5. P5 CHECK MSS CIRCUITS CCF13 (WH/BU) AND RCF13 (WH/BN) FOR A SHORT TOGETHER 
    • Ignition OFF.
    • Measure the resistance between MSS  C284-2, circuit CCF13 (WH/BU) harness side and C284-3, circuit RCF13 (WH/BN).
      Fig 5: Measuring Resistance Between MSS C284-2, Circuit CCF13 (WH/BU) Harness Side And C284-3, Circuit RCF13 (WH/BN)
      G06763035Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to P6  .
    • No:  REPAIR the affected circuit(s). CLEAR the DTC. REPEAT the self-test.
  6. P6 CHECK MSS CIRCUITS CCF13 (WH/BU) AND RCF13 (WH/BN) FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between MSS  C284-2, circuit CCF13 (WH/BU) harness side and ground.
    • Measure the voltage between MSS  C284-3, circuit RCF13 (WH/BN) harness side and ground.
      Fig 6: Measuring Voltage Between MSS C284-3, Circuits CCF13 (WH/BU) And RCF13 (WH/BN) And Ground
      G06128009Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR the affected circuit(s). CLEAR the DTC. REPEAT the self-test.
    • No:  GO to P7  .
  7. P7 CHECK MSS CIRCUIT RCF13 (WH/BN) FOR REFERENCE VOLTAGE 
    • Ignition OFF.
    • Connect: 4X4 Control Module C281A.
    • Ignition ON.
    • Measure the voltage between MSS  C284-3, circuit RCF13 (WH/BN) harness side and ground.
      Fig 7: Measuring Voltage Between MSS C284-3, Circuit RCF13 (WH/BN) Harness Side And Ground
      G06763037Courtesy of FORD MOTOR CO.
    • Is a +5-volt reference present (not battery voltage)? 
    • Yes:  No problem found. The condition may have been caused by a loose or corroded connector. CLEAR the DTCs.

      REPEAT the self-test.

    • No:  INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE . TEST the system for normal operation.
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