Abbreviations and Definitions

BPMV: Brake Pressure Modulator Valve
CKT: Circuit DLC: Data Link Connector
DMM: Digital Multimeter
DRP: Dynamic Rear Proportioning
DTC: Diagnostic Trouble Code
DUMP: Dump Valve
EBCM: Electronic Brake Control Module
EHCU: Electro-Hydraulic Control Unit
Infinite: Open Circuit/Immeasurable High Resistance
ISO: Isolation Valve
LPA: Low Pressure Accumulator
OL: Open Circuit/Immeasurable High Resistance
RWD: Rear Wheel Drive
S4WD: Selectable Four Wheel Drive
VSS: Vehicle Speed Sensor
WSS: Wheel Speed Sensor

The EHCU is the entire ABS assembly, including the BPMV, the EBCM and combination valve. The BPMV is defined as the hydraulic control (lower) portion of the EHCU. It includes the internal control valves, the electric motor and the pumps. The EBCM is the electronic control (upper) portion of the EHCU. The EBCM mounts to the top of the BPMV. The EBCM is housed in aluminum with a black plastic top.