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 MANUALSCHEVROLET2003EXPRESS 1/2 TON VAN V6-4.3L VIN XREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN X
Scan Tool Data Definitions
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XSECTION Scan Tool Data Definitions
Scan Tool Data Definitions
The ABS scan tool data definitions contain a brief description of all ABS related parameters available on the scan tool. The parameters available on the scan tool are listed below in alphanumeric order.
4WD Status: The scan tool displays Two wheel drive/Four wheel drive. The scan tool displays Two wheel drive when the transfer case is shifted into two wheel drive.
ABS Lamp Command: The scan tool displays On/Off. The scan tool displays On when the ABS indicator is commanded ON.
ABS Pump Motor: The scan tool displays On/Off. The scan tool displays On when the ABS pump motor is commanded ON.
ABS Relay Command: The scan tool displays On/Off. The scan tool displays On when the system relay is commanded ON.
ABS Stop State: The scan tool displays On/Off. The scan tool displays On when the ABS is active.
Brake Switch Status: The scan tool displays On/Off. The scan tool displays On when the brake is applied.
Brake Warning Lamp Command: The scan tool displays On/Off. The scan tool displays On when the red brake warning indicator is commanded ON.
Diff. Pressure/Fluid Level Switch: The scan tool displays Ok/Low. The scan tool displays Ok when the brake fluid reservoir has an adequate fluid level and a brake pressure differential is not present.
DRP Active: The scan tool displays Yes/No. The scan tool displays Yes when the DRP is active.
Left Front Wheel Speed: The scan tool displays 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
LF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the left front dump valve solenoid is commanded ON.
LF Dump Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the left front dump valve solenoid is energized.
LF ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the left front isolation valve solenoid is commanded ON.
LF ISO Valve Feedback: he scan tool displays On/Off. The scan tool displays On when the left front isolation valve solenoid is energized.
Rear Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the rear dump valve solenoid is commanded ON.
Rear Dump Valve Feedback: The scan tool displays) On/Off. The scan tool displays On when the rear dump valve solenoid is energized.
Rear ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the rear isolation valve solenoid is commanded ON.
Rear ISO Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the rear isolation valve solenoid is energized.
Rear Wheel Speed: The scan tool display is 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
RF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is commanded Old
RF Dump Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is energized.
RF ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front isolation valve solenoid is commanded ON.
RF ISO Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the right front isolation valve solenoid is energized
Right Front Wheel Speed: The scan tool displays 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
The ABS scan tool data definitions contain a brief description of all ABS related parameters available on the scan tool. The parameters available on the scan tool are listed below in alphanumeric order.
4WD Status: The scan tool displays Two wheel drive/Four wheel drive. The scan tool displays Two wheel drive when the transfer case is shifted into two wheel drive.
ABS Lamp Command: The scan tool displays On/Off. The scan tool displays On when the ABS indicator is commanded ON.
ABS Pump Motor: The scan tool displays On/Off. The scan tool displays On when the ABS pump motor is commanded ON.
ABS Relay Command: The scan tool displays On/Off. The scan tool displays On when the system relay is commanded ON.
ABS Stop State: The scan tool displays On/Off. The scan tool displays On when the ABS is active.
Brake Switch Status: The scan tool displays On/Off. The scan tool displays On when the brake is applied.
Brake Warning Lamp Command: The scan tool displays On/Off. The scan tool displays On when the red brake warning indicator is commanded ON.
Diff. Pressure/Fluid Level Switch: The scan tool displays Ok/Low. The scan tool displays Ok when the brake fluid reservoir has an adequate fluid level and a brake pressure differential is not present.
DRP Active: The scan tool displays Yes/No. The scan tool displays Yes when the DRP is active.
Left Front Wheel Speed: The scan tool displays 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
LF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the left front dump valve solenoid is commanded ON.
LF Dump Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the left front dump valve solenoid is energized.
LF ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the left front isolation valve solenoid is commanded ON.
LF ISO Valve Feedback: he scan tool displays On/Off. The scan tool displays On when the left front isolation valve solenoid is energized.
Rear Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the rear dump valve solenoid is commanded ON.
Rear Dump Valve Feedback: The scan tool displays) On/Off. The scan tool displays On when the rear dump valve solenoid is energized.
Rear ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the rear isolation valve solenoid is commanded ON.
Rear ISO Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the rear isolation valve solenoid is energized.
Rear Wheel Speed: The scan tool display is 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
RF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is commanded Old
RF Dump Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is energized.
RF ISO Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front isolation valve solenoid is commanded ON.
RF ISO Valve Feedback: The scan tool displays On/Off. The scan tool displays On when the right front isolation valve solenoid is energized
Right Front Wheel Speed: The scan tool displays 5 - 257 km/h (3 - 160 mph). The scan tool displays 5 km/h (3 mph) when the vehicle is not moving or moving at speeds less than or equal to 5 km/h (3 mph).
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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.