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HOMESERVICE MANUALSCHEVROLET2008AVEO LT, AUTOMATICREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESNO COMMUNICATION WITH ELECTRONIC BRAKE CONTROL MODULEDIAGNOSTIC AIDS
2008 Chevrolet Aveo LT, Automatic

Diagnostic Aids

2008 Chevrolet Aveo LT, AutomaticSECTION Diagnostic Aids

Typical causes of no communication with the EBCM:

  • Poor terminal contact at the EBCM
  • Loss of EBCM ground to terminal 8 and 24
  • Loss of battery voltage at EBCM terminals 9 and/or 25
  • Loss of ignition voltage at EBCM 4
  • Open/grounded data line
  • Data line with high resistance
Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Turn the ignition switch OFF.
  2. Disconnect the electronic brake control module (EBCM) harness.
  3. Connect a voltmeter to the EBCM harness terminal 9 and then to body ground.
Does the voltage measure within the specified range?		 B+ Go to Step 4  Go to Step 3 
3
  1. Repair the source of the low voltage to terminal 9.
  2. Inspect for an open fuse, poor terminal contact, or a grounded wire.
Did you find and correct the condition?		 - System OK -
4 Connect a voltmeter to the EBCM harness terminal 25 and then to the body ground.
Does the voltage measure within the specified range?		 B+ Go to Step 6  Go to Step 5 
5
  1. Repair the source of the low voltage to terminal 25.
  2. Inspect for an open fuse, poor terminal contact, or a grounded wire.
Did you find and correct the condition?		 - System OK -
6
  1. Turn ON the ignition switch.
  2. Connect a voltmeter to the EBCM harness terminal 4 and then to body ground.
Does the voltage measure within the specified range?		 B+ Go to Step 8  Go to Step 7 
7
  1. Repair the source of the low voltage to terminal 4.
  2. Inspect for an open fuse, poor terminal contact, or a grounded wire.
Did you find and correct the condition?		 - System OK -
8
  1. Turn the ignition switch OFF.
  2. Connect an ohmmeter to the EBCM harness terminal 8 and 24 and then to body ground.
Does the resistance measure less than the specified value?		 2 Ω Go to Step 10  Go to Step 9 
9
  1. Repair the source of the high resistance between terminal 8 and 24.
  2. Find and inspect the ground location where the circuit is secured to body ground.
Did you find and correct the condition?		 - System OK -
10
  1. Turn OFF the ignition switch.
  2. Verify the EBCM harness is still disconnected from the EBCM.
  3. Connect an ohmmeter to the EBCM harness terminal 7 and the data link connector (DLC) terminal 7.
Does the resistance measure less than the specified value?		 2 Ω Go to Step 12  Go to Step 11 
11 Repair the source the high resistance between terminal 7 and DLC terminal 7.
Did you complete the repair?		 - System OK -
12
  1. Turn the ignition switch OFF.
  2. Verify the EBCM harness is still disconnected.
  3. Connect an ohmmeter to the EBCM harness terminal 7 and then to body ground.
Does the resistance measure OL, open circuit?		 - Go to Step 14  Go to Step 13 
13 Find and repair the short to ground on the data line.
Did you find and correct the condition?		 - System OK -
14 Replace the EBCM.
Did you complete the replacement?		 - System OK -
RENDER: 1.0x

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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.