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Pinpoint Test P: Transmission Four Wheel Drive (4X4) Mode Select Switch Failure

WARNING: This page is about a different car, the 2009 Ford Pickup, 2009 Ford F550 Super Duty, 2009 Ford F450 Super Duty, and 2009 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 diagnostic tool.
    • Key in ON position.
    • Monitor each 4WD_SW PID while cycling through each MSS position.
    • Does each MSS PID agree with each switch position? 
    1. YES  : No problem found. CLEAR the DTCs. Go to Pinpoint Test O .
    2. NO  : Go to  P2.
  2. P2 CHECK MSS RESISTANCE VALUES 
    • Key in OFF position.
    • Disconnect: MSS C284
      • Fig 1: Measuring Resistance Between MSS Terminal 2 And Terminal 3
      GF0007468Courtesy of FORD MOTOR CO.
    • Measure the resistance between MSS C284, terminals 2 and 3, component side, while rotating the switch through all positions. Refer to the following chart:
      Mode Select Switch (MSS) Position Resistance
      4X4 Low 4X4 High 2WD
      130 ohms 270 ohms 619 ohms
    • Are the resistance values within specification? 
    1. YES  : Go to  P3.
    2. NO  : INSTALL a new MSS. REFER to Mode Select Switch (MSS) . CLEAR the DTCs. REPEAT the self-test.
  3. P3 CHECK MSS CIRCUIT CCF13 (WH/BU) AND CIRCUIT RCF13 (WH/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C281b
    • Disconnect: MSS C284
    • Measure the resistance between MSS C284-2, circuit CCF13 (WH/BU) harness side and ground.
      • Fig 2: Checking MSS Circuit CCF13 (WH/BU) & RCF13 (WH/BN) For A Short To Ground
      GF0004020Courtesy of FORD MOTOR CO.
    • Measure the resistance between MSS C284-3, circuit RCF13 (WH/BN) harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  P4.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  4. P4 CHECK MSS CIRCUIT CCF13 (WH/BU) AND CIRCUIT RCF13 (WH/BN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C281b
    • Measure the resistance between MSS C284-2 and 4X4 control module C281b-9, circuit CCF13 (WH/BU).
      • Fig 3: Checking MSS Circuit CCF13 (WH/BU) & RCF13 (WH/BN) For An Open
      GF0007469Courtesy of FORD MOTOR CO.
    • Measure the resistance between MSS C284-3 and 4X4 control module C281b-2, circuit RCF13 (WH/BN).
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  P5.
    2. NO  : REPAIR the affected circuit(s). CONNECT the 4X4 control module. CLEAR the DTCs. REPEAT the self-test.
  5. P5 CHECK MSS CIRCUIT CCF13 (WH/BU) AND CIRCUIT RCF13 (WH/BN) FOR A SHORT TOGETHER 
    • Key in OFF position.
      • Fig 4: Checking MSS Circuit CCF13 (WH/BU) & RCF13 (WH/BN) For A Short Together
      GF0007470Courtesy of FORD MOTOR CO.
    • Measure the resistance between MSS C284-2, circuit CCF13 (WH/BU) harness side and C284-3, circuit RCF13 (WH/BN).
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  P6.
    2. NO  : REPAIR the circuits. CLEAR the DTC. REPEAT the self-test.
  6. P6 CHECK MSS CIRCUIT CCF13 (WH/BU) AND CIRCUIT RCF13 (WH/BN) FOR A SHORT TO BATTERY 
    • Key in ON position.
    • Disconnect: 4X4 Control Module C281b
    • Measure the voltage between MSS C284-2, circuit CCF13 (WH/BU) harness side and ground.
      • Fig 5: Checking MSS Circuit CCF13 (WH/BU) & RCF13 (WH/BN) For A Short To Battery
      GF0004019Courtesy of FORD MOTOR CO.
    • Measure the voltage between MSS C284-3, circuit RCF13 (WH/BN) harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit(s). CLEAR the DTC. REPEAT the self-test.
    2. NO  : Go to  P7.
  7. P7 CHECK MSS CIRCUIT RCF13 (WH/BN) FOR REFERENCE VOLTAGE 
    • Connect: 4X4 Control Module C281b
    • Key in ON position.
      • Fig 6: Checking MSS Circuit RCF13 (WH/BN) For Reference Voltage
      GF0007471Courtesy of FORD MOTOR CO.
    • Measure the voltage between MSS C284-3, circuit RCF13 (WH/BN) harness side and ground.
    • Is a +5-volt reference present (not battery voltage)? 
    1. YES  : No problem found. The condition may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new 4X4 control module. REFER to 4X4 Control Module . TEST the system for normal operation.
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