Electronic Brake Control Module: Service and Repair

Fig. 222 Intermediate Shaft & Universal Joint Assembly.:

Fig. 223 EHCU/BPMV Replacement.:

(EHCU) Electro-Hydraulic Control Unit / (BPMV) Brake Pressure Modulator Valve Module is not serviceable and must be replaced as a unit.

1. Remove steering column intermediate shaft as follows:

WARNING: Refer to Air Bags and Seat Belts / Air Bags (Supplemental Restraint Systems) / Service and Repair / Air Bag System Disarming & Arming. Air Bag(s) Arming and Disarming

a. Set wheels in straight ahead position.
b. Mark upper universal joint yoke to steering shaft and lower yoke to steering gear wormshaft for installation reference.
c. Remove upper and lower universal pinch bolts, Fig. 222.
d. Remove steering gear frame bolts, then lower the steering gear.
e. Remove intermediate shaft and universal joint assembly.

2. Disconnect brake lines from bottom of combination valve.

3. Disconnect electrical connector from combination valve.

4. Remove master cylinder and combination valve assembly.

5. Remove brake lines from EHCU/BPMV module, then disconnect module electrical connectors.

6. Remove EHCU/BPMV bracket attaching nuts and bolt, Fig. 223.

7. Remove module and bracket assembly from vehicle, then the module from bracket assembly.

8. Reverse procedure to install, noting the following:
a.a Torque module to bracket bolts to 5 ft. lbs.
b. Torque bracket attaching bolt to 33 ft. lbs., then the two attaching nuts to 20 ft. lbs.
c. Torque brake line fittings to module to 16 ft. lbs.
d. Torque brake line fittings to combination valve to 15 ft. lbs.
e. Install lower yoke onto steering gear wormshaft aligning marks made during removal.
f. Install pinch bolt, making sure bolt passes through shaft undercut, then torque bolt to 30 ft. lbs.
g. Raise steering gear into position while guiding upper yoke assembly onto steering shaft, align marks made during removal.
h. Torque steering gear to frame bolts to 55 ft. lbs.
i. Install pinch bolt, making sure bolt passes through shaft undercut, then torque bolt to 30 ft. lbs.
j. Measure Cardan joint operating angle as shown in Fig. 222. Angle must be 34-39°.
k. Bleed brake system and EHCU/BPMV module. Brake Bleeding