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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Transfer Case - Four-Wheel Drive (4WD) System - Diagnostics) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test D: DTCs P1824/P1825 >> PINPOINT TEST D: DTCs P1824/P1825

PINPOINT TEST D: DTCs P1824/P1825

WARNING: This page is about a different variant/trim than selected.
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test.
  1. D1 CHECK FOR 4X4 CONTROL MODULE DTCs 
    • Ignition ON.
    • Carry out the 4X4 control module self-test.
    • Are any DTCs received? 
  2. D2 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH ATC SOLENOID (PART OF REAR AXLE) CONNECTED 
    • Ignition OFF.
    • Disconnect: 4X4 Control Module C281.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ground.
      Fig 1: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH) And Ground
      G06064360Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  D5.
    • No  : GO to D3.
  3. D3 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH C281 DISCONNECTED 
    • Disconnect: ATC  Solenoid Jumper Harness C314.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C281- 16, circuit RCF21 (WH/VT), harness side and ground.
      Fig 2: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH) And Ground
      G06064360Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to D4.
    • No  : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
  4. D4 CHECK THE ATC SOLENOID JUMPER HARNESS 
    NOTE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATC  Solenoid C4347.
    • Inspect the ATC  solenoid jumper harness for damage.
    • Is the ATC solenoid jumper harness damaged? 
    • Yes  : REPAIR or INSTALL a new ATC  solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    • No  : INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL . CLEAR the DTCs. REPEAT the self-test.
  5. D5 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN WITH ATC SOLENOID CONNECTED 
    • Connect: ATC  Solenoid C4347 and ATC  Solenoid Jumper Harness C314.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side.
      Fig 3: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH) And 4X4 Control Module C281-16 Circuit RCF21 (WH/VT)
      G06064362Courtesy of FORD MOTOR CO.
    • Is the resistance less than 10 ohms? 
    • Yes  : GO to  D8.
    • No  : GO to D6.
  6. D6 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN AT C314 
    • Disconnect: ATC  Solenoid Jumper Harness C314.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ATC  solenoid jumper harness C314-1, circuit CCF21 (VT/WH).
      Fig 4: Checking Circuits CCF21 (VT/WH) For An Open At C314
      G06064363Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Measure the resistance between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ATC  solenoid jumper harness C314-2, circuit RCF21 (WH/VT), harness side.
      Fig 5: Checking Circuits RCF21 (WH/VT) For An Open At C314
      G06064364Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to D7.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. D7 CHECK THE ATC SOLENOID CIRCUIT FOR AN INTERNAL OPEN 
    NOTE: The ATC  solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATC  Solenoid C4347.
    • Measure the resistance between ATC  solenoid C4347-1, circuit CCF21 (VT/WH), component side, and ATC  solenoid C4347-2, circuit RCF21 (WH/VT), component side.
      Fig 6: Checking ATC Solenoid Circuit For An Internal Open
      G06064365Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 10 ohms? 
    • Yes  : REPAIR or INSTALL a new ATC  solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    • No  : INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL . CLEAR the DTCs. REPEAT the self-test.
  8. D8 CHECK CIRCUIT GD145 (BK/BU) FOR AN OPEN 
    • Measure the resistance between 4X4 control module C281-15, circuit GD145 (BK/BU), harness side and ground.
      Fig 7: Checking Circuit GD145 (BK/BU) For An Open
      G06064366Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to D9.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  9. D9 CHECK THE 4X4 CONTROL MODULE POWER CIRCUITS 
    • Ignition ON.
    • Measure the voltage between 4X4 control module C281-5, circuit SBP11 (WH/RD), harness side and ground; and between 4X4 control module C281-4, circuit CBP35 (BN/WH), harness side and ground.
      Fig 8: Measuring Voltage Between 4X4 Control Module C281-5, Circuit SBP11 (WH/RD) And Ground
      G06064367Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to D10.
    • No  : CHECK SJB fuses 11 (10A) and 35 (10A). REPAIR the circuit in question for open or short to ground. CLEAR the DTCs. REPEAT the self-test.
  10. D10 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect: 4X4 Control Module C281.
    • Check the harness and component side connectors for:
      • corrosion.
      • pushed-out/bent pins.
    • Check the ATC  solenoid jumper harness between the 4X4 control module and the ATC  solenoid, located on the rear subframe.
    • Connect the 4X4 control module and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new 4X4 control module. REFER to 4X4 Control Module . CLEAR the DTCs. REPEAT the self-test.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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