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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case - Four-Wheel Drive (4WD) System - Diagnostics) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - All Wheel Drive (AWD) >> Pinpoint Tests >> Pinpoint Test E: Vehicle Has No or Inadequate Torque at Rear Wheels

Pinpoint Test E: Vehicle Has No or Inadequate Torque at Rear Wheels

WARNING: This page is about a different variant/trim than selected.

Refer to appropriate SYSTEM WIRING DIAGRAMS - EDGE or SYSTEM WIRING DIAGRAMS - MKX article for All Wheel Drive (AWD) schematic and connector information.

Normal Operation 

The on-demand four wheel drive (4WD) system uses data from other systems as inputs to the 4X4 control module. The 4X4 control module uses the inputs to determine the appropriate duty cycle to send to the active torque control coupling (ATCC) solenoid (part of rear axle) that delivers the desired torque to the rear wheels. If the 4X4 control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4X4 control module may not allow 4WD operation.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST E: VEHICLE HAS NO OR INADEQUATE TORQUE AT REAR WHEELS 

NOTE: Carry out Inspection and Verification as outlined before carrying out this pinpoint test.
  1. E1 CHECK FOR 4X4 CONTROL MODULE DTCs 
    • Key in ON position.
    • Carry out the 4X4 control module self-test.
    • Are any DTCs received? 
    1. YES  : For DTC P1824 or P1825, go to  E5.

      For all other DTCs, REFER to the 4X4 Control Module DTC Chart in this service information.

    2. NO  : Go to  E2.
  2. E2 CHECK HIGH-SPEED CONTROLLER AREA NETWORK (HS-CAN) CIRCUITS BETWEEN DATA LINK CONNECTOR (DLC) AND 4X4 CONTROL MODULE FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C281
      • Fig 1: Checking High Speed Can Circuits Between DLC And 4X4 Control Module For An Open
      GF0030112Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4X4 control module C281-4, circuit VDB04 (WH/BU), harness side and DLC C251-6, circuit VDB04 (WH/BU), harness side; and between 4X4 control module C281-12, circuit VDB05 (WH), harness side and DLC C251-14, circuit VDB05 (WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the Network Test.
  3. E3 CHECK HS-CAN CIRCUITS FOR A SHORT TO GROUND 
      Fig 2: Checking High Speed CAN Circuits For A Short To Ground
      GF0030113Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4X4 control module C281-4, circuit VDB04 (WH/BU), harness side and ground; and between 4X4 control module C281-12, circuit VDB05 (WH), harness side and ground.
    • Are the resistances greater than 5,000 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the Network Test.
  4. E4 CHECK RESISTANCE BETWEEN HS-CAN CIRCUITS 
      Fig 3: Checking Resistance Between High Speed CAN Circuits
      GF0030114Courtesy of FORD MOTOR CO.
      NOTE: The PCM and the instrument cluster (IC) must be connected and operating correctly to obtain the correct resistance between the HS-CAN circuits.
    • Measure the resistance between 4X4 control module C281-4, circuit VDB04 (WH/BU) harness side and 4X4 control module C281-12, circuit VDB05 (WH) harness side.
    • Is the resistance 60 ohms (± 5 ohms)? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test. CARRY OUT the Network Test.
  5. E5 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH ATCC SOLENOID (PART OF REAR AXLE) CONNECTED 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C281
      • Fig 4: Checking Circuits CCF21 (VT/WH) & RCF21 (WH/VT) For A Short To Ground With ATC Solenoid Connected
      GF0041483Courtesy of FORD MOTOR CO.
    • 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.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E8.
    2. NO  : Go to  E6.
  6. E6 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH C4004 DISCONNECTED 
    • Disconnect: ATCC Solenoid Jumper Harness C4004
      • Fig 5: Checking Circuits CCF21 (VT/WH) & RCF21 (WH/VT) For A Short To Ground With ATC Solenoid Connected
      GF0041483Courtesy of FORD MOTOR CO.
    • 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.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  E7.
    2. NO  : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
  7. E7 CHECKING THE ATCC SOLENOID JUMPER HARNESS WIRES 
    NOTE: The active torque control coupling (ATCC) solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATCC Solenoid C4347
    • Inspect the ATCC solenoid jumper harness for damage.
    • Is the ATCC solenoid jumper harness damaged? 
    1. YES  : REPAIR or INSTALL a new ATCC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL article. CLEAR the DTCs. REPEAT the self-test.
  8. E8 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN WITH ATCC SOLENOID CONNECTED 
    • Connect: ATCC Solenoid C4347 and ATCC Solenoid Jumper Harness C4004
      • Fig 6: Checking Circuits CCF21 (VT/WH) & RCF21 (WH/VT) For An Open With ATC Solenoid Connected
      GF0041484Courtesy of FORD MOTOR CO.
    • 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.
    • Is the resistance less than 10 ohms? 
    1. YES  : Go to  E11.
    2. NO  : Go to  E9.
  9. E9 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN AT C4004 
    • Disconnect: ATCC Solenoid Jumper Harness C4004
      • Fig 7: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH) & ATCC solenoid jumper harness C4004-1, circuit CCF21 (VT/WH)
      GF0030115Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ATCC solenoid jumper harness C4004-1, circuit CCF21 (VT/WH).
    • Repeat this measurement while wiggling the harness.
      • Fig 8: Measuring Resistance Between 4X4 Control Module C281-16, Circuit RCF21 (WH/VT) & ATCC Solenoid Jumper Harness C4004-2, Circuit RCF21 (WH/VT)
      GF0030116Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ATCC solenoid jumper harness C4004-2, circuit RCF21 (WH/VT), harness side.
    • Repeat this measurement while wiggling the harness.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E10.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  10. E10 CHECK THE ATCC SOLENOID CIRCUIT FOR AN INTERNAL OPEN 
    NOTE: The active torque control coupling (ATCC) solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATCC Solenoid C4347
      • Fig 9: Checking ATC Solenoid Circuit For An Internal Open
      GF0041485Courtesy of FORD MOTOR CO.
    • Measure the resistance between ATCC solenoid C4347-1, circuit CCF21 (VT/WH), component side and ATCC solenoid C4347-2, circuit RCF21 (WH/VT), component side.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 10 ohms? 
    1. YES  : REPAIR or INSTALL a new ATCC solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL article. CLEAR the DTCs. REPEAT the self-test.
  11. E11 CHECK CIRCUIT GD140 (BK/GN) FOR AN OPEN 
      Fig 10: Checking Circuit GD126 (BK/WH) For An Open
      GF0041481Courtesy of FORD MOTOR CO.
    • Measure the resistance between 4X4 control module C281-15, circuit GD140 (BK/GN), harness side and ground.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E12.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  12. E12 CHECK THE 4X4 CONTROL MODULE POWER CIRCUITS 
    • Key in ON position.
      • Fig 11: Checking 4X4 Control Module Power Circuits
      GF0041482Courtesy of FORD MOTOR CO.
    • Measure the voltage between 4X4 control module C281-6, circuit SBP11 (BU/RD), harness side and ground; and between 4X4 control module C281-5, circuit CBP35 (YE/GY), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  E13.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  13. E13 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 ATCC solenoid jumper harness between the 4X4 control module and the ATCC 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? 
    1. YES  : INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE . CLEAR the DTCs. REPEAT the self-test.
    2. 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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