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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1407 (ANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS (W/NW7)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Scan Tool Output Controls (W/NW7)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Scan Tool Output Controls (W/NW7)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Output Controls (W/NW7)

Scan Tool Output Control Additional Menu Selections Description
Refer to the scan tool manual for complete scan tool operating instructions.
Function Test - The EBCM commands the system relay, valve solenoids and pump motor ON and OFF. The EBCM sets a DTC if a malfunction is detected.
Automated Bleed - The EBCM commands each valve solenoid and the pump motor ON and OFF in a special sequence in order to bleed air out of the BPMV. Refer to ABS Automated Bleed Procedure  for a step-by-step procedure.
ABS Motor - This function allows the technician to command the ABS pump motor On and Off.
System Identification - The scan tool displays the hardware and software revision of the EBCM.
Tire Size Calibration
  • Read Tire Calibration
  • New Tire Size
IMPORTANT: The PCM must also be programmed with the correct tire size calibration when different size tires are installed on the vehicle. Refer to Service Programming System (SPS) in Programming.
This function allows the technician to read the tire size calibration of the EBCM or calibrate the EBCM to the correct tire size. Calibration must be performed when the EBCM is replaced or when different size tires are installed on the vehicle.
Lamp Tests
  • ABS Lamp
  • Brake Lamp
 This function allows the technician to command the ABS indicator or the red BRAKE warning indicator On and Off.
Solenoid Tests
  • Left Front Isolation Valve
  • Left Front Dump Valve
  • Right Front Isolation Valve
  • Right Front Dump Valve
  • Rear Isolation Valve
  • Rear Dump Valve
 This function allows the technician to command a selected valve solenoid On and Off. Use the procedure below in order to verify proper operation of the EBCM and BPMV.

Solenoid Test Procedure

  1. Raise the vehicle so the wheels are about 15 cm (6 in) off the floor. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Select the desired Solenoid Test on the scan tool.
    IMPORTANT: Steps 3, 4 and 5 must be performed within a 5 second time period. The EBCM will only energize a solenoid for 5 seconds.
  3. Command the solenoid On.
  4. Apply the brake.
  5. Have an assistant attempt to spin the wheel of the brake circuit being tested. The wheel should spin even though the brake is being applied.
ABS Relay - This function allows the technician to command the system relay On and Off.
Low Trac Lamp - This function allows the technician to command the LOW TRACTION indicator On and Off.
Traction Off Lamp - This function allows the technician to command the TRACTION OFF indicator On and Off.
Requested Torque - This function allows the technician to turn Off engine torque reduction in order to verify proper operation of the Traction Control System.
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.