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Integrated Control Unit (ICU) - MK25E: Installation

  1. Place the ICU and mounting bracket into the engine compartment, inserting bracket hooks into hanger holes in body frame rail. See Figure.
  2. Install the front mounting screw attaching the ICU mounting bracket to the body. See Figure. Do not tighten screw at this time. 
  3. Raise and support the vehicle. (Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE)
  4. Install the two rear mounting screws attaching the ICU mounting bracket to the body. See Figure. Tighten both screws to 23 N.m (200 in. lbs.) torque.
  5. Lower the vehicle.
  6. Tighten the front mounting screw attaching the ICU mounting bracket to the body to 23 N.m (200 in. lbs.) torque. See Figure.
    CAUTION: Before installing the 47-way connector on the ABM, be sure the seal is properly installed in the connector.
  7. Install the 47-way wiring connector into the socket of the ABM and close the cover, locking the connector in place. See Figure.
  8. Install the four chassis brake tubes going to the wheel brakes into their respective outlet ports on the ICU HCU. See Figure, Figure and Figure. Using a crow foot wrench on a torque wrench, tighten the four tube nuts to 17 N.m (145 in. lbs.) torque.
  9. Install the primary and secondary brake tubes from the master cylinder into the HCU ports. See Figure and Figure. Using a crow foot wrench on a torque wrench, tighten the tube nuts to 17 N.m (145 in. lbs.) torque.
  10. Position the power distribution center and bracket back into place and install the mounting bolts. See Figure and Figure.
  11. Connect the wiring connector to the brake fluid level switch. See Figure.
  12. Install the battery. (Refer to ELECTRICAL/BATTERY SYSTEM/BATTERY - INSTALLATION)
  13. Install the air cleaner housing.
  14. Install the air cleaner cover.
  15. Hook up the scan tool to initialize the new ABM. Clear any faults and perform verification test.
  16. Fill the master cylinder to the proper fill level and bleed the base and ABS hydraulic systems. Refer to STANDARD PROCEDURE - BASE BRAKE BLEEDING and (Refer to BRAKES - ABS - STANDARD PROCEDURE) 
  17. Road test the vehicle to ensure proper operation of the base and antilock brake systems.
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