Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1995BERETTA L4-2.2L VIN 4REPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSELECTRONIC BRAKE CONTROL MODULEDESCRIPTION AND OPERATION
1995 Chevrolet Beretta L4-2.2L VIN 4
Electronic Brake Control Module: Description and Operation
1995 Chevrolet Beretta L4-2.2L VIN 4SECTION Description and Operation
DESCRIPTION
The ABS system is controlled by a microprocessor based Electronic Brake Control Module (EBCM). Inputs to the system include four wheel speed sensors, brakes, ignition switch and unswitched battery voltage. Outputs include three bi-directional motor controls, three lamp controls, two solenoid controls and the system enable relay. A serial data line, located in terminal 9 of the Data Link Connector (DLC), is provided for service diagnostic tools and assembly plant testing.
The EBCM monitors the speed of each wheel. If any wheel begins to approach lock-up and the brake switch is on, the EBCM controls the motors and solenoids to reduce brake pressure to the wheel approaching lock-up. Once the wheel regains traction, brake pressure is increased until wheel begins to approach lock-up. This cycle repeats until either vehicle comes to a stop, the brake is released or no wheels approach lock-up. Additionally, the EBCM monitors itself, each input and each output for proper operation. If any system fault is detected, the EBCM will store a DTC in nonvolatile memory.
On a EBTCM, the ABS portion of the module operates the same as a EBCM. A EBTCM is used if the vehicle is equipped with either the Enhanced Traction System (ETS) or Traction Control System (TCS). The ETS or TCS portion of the EBTCM monitors wheel spin slip through the drive wheels speed sensors. If the wheels begin to slip, the EBTCM determines the desired wheel torque needed to minimize wheel slip. This information is sent to the PCM through the Serial data link. On models equipped w/ETS, the PCM controls engine torque by ignition retard and transmission shifts. On models equipped w/TCS, the PCM controls engine torque by ignition retard, transmission shifts and applies brakes several times until the vehicle regains traction. Once the vehicle regains traction, brake pressure is decreased and engine torque reduction is no longer requested. This cycle repeats until traction control is no longer necessary.
The ABS system is controlled by a microprocessor based Electronic Brake Control Module (EBCM). Inputs to the system include four wheel speed sensors, brakes, ignition switch and unswitched battery voltage. Outputs include three bi-directional motor controls, three lamp controls, two solenoid controls and the system enable relay. A serial data line, located in terminal 9 of the Data Link Connector (DLC), is provided for service diagnostic tools and assembly plant testing.
The EBCM monitors the speed of each wheel. If any wheel begins to approach lock-up and the brake switch is on, the EBCM controls the motors and solenoids to reduce brake pressure to the wheel approaching lock-up. Once the wheel regains traction, brake pressure is increased until wheel begins to approach lock-up. This cycle repeats until either vehicle comes to a stop, the brake is released or no wheels approach lock-up. Additionally, the EBCM monitors itself, each input and each output for proper operation. If any system fault is detected, the EBCM will store a DTC in nonvolatile memory.
On a EBTCM, the ABS portion of the module operates the same as a EBCM. A EBTCM is used if the vehicle is equipped with either the Enhanced Traction System (ETS) or Traction Control System (TCS). The ETS or TCS portion of the EBTCM monitors wheel spin slip through the drive wheels speed sensors. If the wheels begin to slip, the EBTCM determines the desired wheel torque needed to minimize wheel slip. This information is sent to the PCM through the Serial data link. On models equipped w/ETS, the PCM controls engine torque by ignition retard and transmission shifts. On models equipped w/TCS, the PCM controls engine torque by ignition retard, transmission shifts and applies brakes several times until the vehicle regains traction. Once the vehicle regains traction, brake pressure is decreased and engine torque reduction is no longer requested. This cycle repeats until traction control is no longer necessary.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.