Abbreviations and Definitions for GMC Truck GMC P42 Commercial Chassis 1999

BPMV: Brake Pressure Modulator Valve

CKT: Circuit

DLC: Data Link Connector

DMM: Digital Multimeter

DTC: Diagnostic Trouble Code

EBCM: Electronic Brake Control Module

EHCU: Electro-Hydraulic Control Unit

Infinite: Open Circuit/Unmeasurably High Resistance

LPA: Low Pressure Accumulator

OL: Open Circuit/Unmeasurably High Resistance

WSS: Wheel Speed Sensor

The EHCU is the entire ABS unit, including the BPMV and the EBCM. The BPMV is defined as the hydraulic control portion of the EHCU. The BPMV includes the internal control valves, the electric motor and the pumps. The BPMV does not include the EBCM. The EBCM is the electronic control portion of the EHCU. The EBCM mounts to the top of the BPMV. The EBCM is housed in aluminum with a black plastic top.