Grand Voyager V6-201 3.3L VIN R SMFI (1997)
Hydraulic Control Unit: Service Precautions
CAUTION:
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The only parts of the Hydraulic Control Unit (HCU) that can be replaced (serviced) are the Controller Anti-Lock Brake (CAB) and HCU
mounting bracket. The remaining components of the HCU are not serviceable items. No attempt should ever be made to remove or service any
other parts of the HCU. This is due to the concern of contamination entering the HCU while performing a service procedure.
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Do not apply a 12 volt power source to any terminals of the 25 way HCU connector when disconnected.
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Before removing the brake tubes from the HCU, the HCU must be thoroughly cleaned. This must be done to prevent dirt particles from falling into
the ports of HCU or entering the brake tubes.
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The HCU mounting bracket to front suspension cradle mounting bolts have a unique corrosion protection coating and a special aluminum washer.
For this reason, only the original, or original equipment Mopar replacement bolts can be used to mount the HCU bracket to the front suspension
crossmember.
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Because of the flexible section in the primary and secondary brake tubes, and the brake tubes between the HCU and the proportioning valve, the
brake tubes must be held in proper orientation when tightened and torqued. These tubes must not contact each other or other vehicle components
when installed.
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When installing the chassis brake tubes on the HCU valve block, they must be located correctly in the valve block to ensure proper ABS operation.
Refer to the image for the correct chassis brake tube locations.
NOTE:
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The chassis brake tube attachment locations to the HCU, are marked on the bottom of the HCU mounting bracket.
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Before installing the 25 way connector in the CAB be sure the seal is properly installed in the connector.
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The CAB wiring harness must be clipped to the HCU mounting bracket. This will ensure the wiring harness is properly routed and does not
contact the brake tubes or the body of the vehicle.
