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Home >> Ford >> 2007 >> Edge SE, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 777 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test Q: Transmission Four Wheel Drive (4WD) Mode Select Switch Failure >> Pinpoint Test Q: Transmission Four Wheel Drive (4WD) Mode Select Switch Failure

Pinpoint Test Q: Transmission Four Wheel Drive (4WD) Mode Select Switch Failure

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Q1 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 P .
    2. NO  : Go to  Q2.
  2. Q2 CHECK MSS RESISTANCE VALUES 
    • Key in OFF position.
    • 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:
      Fig 1: Measuring Resistance Between MSS Terminal 2 And Terminal 3
      GF0007468Courtesy of FORD MOTOR CO.
      Mode Select Switch (MSS) Position Resistance
      4L 4H 2H
      130 ohms 270 ohms 619 ohms
    • Are the resistance values within specification? 
    1. YES  : Go to  Q3.
    2. NO  : INSTALL a new MSS. REFER to Mode Select Switch (MSS)  in this article. CLEAR the DTCs. REPEAT the self-test.
  3. Q3 CHECK MSS CIRCUITS 465 (WH/LB) AND 780 (DB) FOR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C281b
    • Disconnect: MSS C284
    • Measure the resistance between MSS C284-2, circuit 465 (WH/LB) harness side and ground.
    • Measure the resistance between MSS C284-3, circuit 780 (DB) harness side and ground.
      • Fig 2: Measuring Resistance Between MSS C284-2, Harness Side And Ground
      GF0004020Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  Q4.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  4. Q4 CHECK MSS CIRCUITS 465 (WH/LB) AND 780 (DB) 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 465 (WH/LB).
    • Measure the resistance between MSS C284-3 and 4X4 control module C281b-2, circuit 780 (DB).
      • Fig 3: Checking MSS Circuits 465 (WH/LB) And 780 (DB) For Open
      GF0007469Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Q5.
    2. NO  : REPAIR the affected circuit(s). CONNECT the 4X4 control module. CLEAR the DTCs. REPEAT the self-test.
  5. Q5 CHECK MSS CIRCUITS 465 (WH/LB) AND 780 (DB) FOR SHORT TOGETHER 
    • Key in OFF position.
    • Measure the resistance between MSS C284-2, circuit 465 (WH/LB) harness side and C284-3, circuit 780 (DB).
      • Fig 4: Checking MSS Circuits 465 (WH/LB) And 780 (DB) For Short Together
      GF0007470Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  Q6.
    2. NO  : REPAIR the circuits. CLEAR the DTC. REPEAT the self-test.
  6. Q6 CHECK MSS CIRCUITS 465 (WH/LB) AND 780 (DB) FOR A SHORT TO BATTERY 
    • Key in ON position.
    • Disconnect: 4X4 Control Module C281b
    • Measure the voltage between MSS C284-2, circuit 465 (WH/LB) harness side and ground.
    • Measure the voltage between MSS C284-3, circuit 780 (DB) harness side and ground.
      • Fig 5: Checking MSS Circuits 465 (WH/LB) And 780 (DB) For Short To Battery
      GF0004019Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. YES  : REPAIR the circuit(s). CLEAR the DTC. REPEAT the self-test.
    2. NO  : Go to  Q7.
  7. Q7 CHECK MSS CIRCUIT 780 (DB) FOR REFERENCE VOLTAGE 
    • Connect: 4X4 Control Module C281b
    • Key in ON position.
    • Measure the voltage between MSS C284-3, circuit 780 (DB) harness side and ground.
      • Fig 6: Checking MSS Circuit 780 (DB) For Reference Voltage
      GF0007471Courtesy of FORD MOTOR CO.
    • 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 to4X4 Control Module  in this article. TEST the system for normal operation.
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