4WAL: Four Wheel Antilock
BPMV: Brake Pressure Modulator Valve
CKT: Circuit
DLC: Data Link Connector
DMM: Digital Multimeter
DTC: Diagnostic Trouble Code
DUMP: Dump Valve
EBCM: Electronic Brake Control Module
EHCU: Electro-Hydraulic Control Unit
Infinite: Open Circuit/Unmeasurably High Resistance
ISO: Isolation Valve
LPA: Low Pressure Accumulator
OL: Open Circuit/Unmeasurably High Resistance
2WD: Two Wheel Drive
4WD: 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 (uper) portion of the EHCU.
The EBCM mounts to the top of the BPMV. The EBCM is housed in aluminum with
a black plastic top.