Canyon, Colorado 2004-2005

Electronic Brake Control Module

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The controlling element of the ABS system is a microprocessor-based Electronic Brake Control Module (EBCM). If the vehicle is equipped with traction control, the microprocessor is called the Electronic Brake Traction Control Module (EBTCM). Inputs to the system include four wheel speed sensors, the brake switch, ignition switch and unswitched battery voltage. Outputs include three bi-directional motor controls, four indicator 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 scan tools.

The EBCM/EBTCM monitors the speed of each wheel. If any wheel begins to approach lock-up and the brake switch is on, the EBCM/EBTCM 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 the wheel again begins to approach lock-up. This cycle repeats until either the vehicle comes to a stop, the brake is released, or no wheels approach lock-up. Additionally, the EBCM/EBTCM monitors itself, each input (except the serial data line) and each output for proper operation. If any system malfunction is detected, the EBCM/EBTCM will store a DTC in nonvolatile memory (DTCs will not disappear if the battery is disconnected).


NOTE
The EBCM/EBTCM has no serviceable or removable PROM. If defective, the EBCM/EBTCM must be replaced as an assembly.

The Electronic Brake Control Relay is a normally-open contact type relay. It has special contact material to handle the high currents required for ABS/ETS operation. The relay allows battery voltage and current to be supplied to the Brake Solenoid Valves and the EBCM/EBTCM, which supplies power to the ABS Brake Motors.

Removal & Installation



  1. Install clean paper and/or shop towels between the Electronic Brake Control Module (EBCM) assembly and the inner fender.
  2.  
  3. Remove the electrical connector from the EBCM.
  4.  
  5. Remove the brakes pipes from the master cylinder to the EBCM assembly.
  6.  
  7. Remove the rear brake pipe from the retainers at the cowl.
  8.  
  9. Remove the brake pipes from the EBCM assembly.
  10.  
  11. Install rubber plugs into the brake pipes to limit the loss of brake fluid and prevent contamination.
  12.  
  13. Install rubber plugs into the brake pressure modulator valve (BPMV).
  14.  
  15. Install rubber plugs into the master cylinder.
  16.  
  17. Remove the mounting nuts from the EBCM.
  18.  
  19. Remove the EBCM from the vehicle.
  20.  

To install:

  1. Install the ABS module to the vehicle.
  2.  
  3. Install mounting nuts for the ABS module.
  4.  
  5. Remove the rubber plugs from the brake pipes.
  6.  
  7. Remove the shipping plugs from the EBCM assembly.
  8.  
  9. Remove the rubber plugs from the master cylinder.
  10.  
  11. Install the brake pipes from the EBCM assembly to the master cylinder and tighten to 14 ft. lbs. (19 Nm).
  12.  
  13. Remove the electrical connector from the behind the brake booster.
  14.  
  15. Install the electrical connector.
  16.  
  17. Install the rear brake pipe to the retainer at the cowl.
  18.  
  19. Remove the paper and or shop towels from between the EBCM assembly and the inner fender.
  20.  
  21. Bleed the ABS brake system.
  22.  

  1. Install clean paper and/or shop towels between the Electronic Brake Control Module (EBCM) assembly and the inner fender.
  2.  
  3. Remove the electrical connector from the EBCM.
  4.  
  5. Remove the brakes pipes from the master cylinder to the EBCM assembly.
  6.  
  7. Remove the rear brake pipe from the retainers at the cowl.
  8.  
  9. Remove the brake pipes from the EBCM assembly.
  10.  
  11. Install rubber plugs into the brake pipes to limit the loss of brake fluid and prevent contamination.
  12.  
  13. Install rubber plugs into the brake pressure modulator valve (BPMV).
  14.  
  15. Install rubber plugs into the master cylinder.
  16.  
  17. Remove the mounting nuts from the EBCM.
  18.  
  19. Remove the EBCM from the vehicle.
  20.  

To install:

  1. Install the ABS module to the vehicle.
  2.  
  3. Install mounting nuts for the ABS module.
  4.  
  5. Remove the rubber plugs from the brake pipes.
  6.  
  7. Remove the shipping plugs from the EBCM assembly.
  8.  
  9. Remove the rubber plugs from the master cylinder.
  10.  
  11. Install the brake pipes from the EBCM assembly to the master cylinder and tighten to 14 ft. lbs. (19 Nm).
  12.  
  13. Remove the electrical connector from the behind the brake booster.
  14.  
  15. Install the electrical connector.
  16.  
  17. Install the rear brake pipe to the retainer at the cowl.
  18.  
  19. Remove the paper and or shop towels from between the EBCM assembly and the inner fender.
  20.  
  21. Bleed the ABS brake system.
  22.  

 
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