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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISBRAKESANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS (W/O JL4)

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Scan Tool Output Controls (W/O JL4)

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Scan Tool Output Controls (W/O JL4)

Scan Tool Output Control	Additional Menu Selections	Description
Refer to the scan tool manual for complete scan tool operating instructions.
Function Test	-	The electronic brake control module (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 brake pressure modulator valve (BPMV). Refer to ABS Automated Bleed Procedure (W/JL4) or ABS Automated Bleed Procedure (w/o JL4) for a step-by-step procedure.
ABS Motor	-	This function allows the technician to command the ABS pump motor ON and OFF.
ABS Relay	-	This function allows the technician to command the system relay 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 powertrain control module (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 and Setup. 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.
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 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. 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. Command the solenoid ON. Apply the brake. 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.

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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.