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.
Scan Tool Data Definitions (w/JL4)
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 Cmd: The scan tool displays On/Off. The scan tool displays On when the red brake warning indicator is commanded on.
Diff. Pressure/Fluid Level: The scan tool displays Ok/Low. The scan tool displays Ok when the brake fluid reservoir has an adequate fluid level.
Delivered Torque: The scan tool displays 25-95%. The scan tool displays 25% when the PCM provides the minimum percentage of available torque in an attempt to eliminate wheel slip.
DRP Active: The scan tool displays Yes/No. The scan tool displays Yes when the DRP is active.
Lateral Accelerometer Input: The scan tool displays 0-5 Volts. The Scan tool displays 2.5 Volts when lateral acceleration is 0 g.
Left Front Wheel Speed: The scan tool displays 3-257 km/h (2-160 mph). The scan tool displays 3 km/h (2 mph) when the vehicle is not moving or is moving at speeds less than or equal to 3 km/h (2 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: The scan tool displays On/Off. The scan tool displays On when the left front isolation valve solenoid is energized.
Low Traction Lamp Command: The scan tool displays On/Off. The scan tool displays On when the low traction indicator is commanded on.
Master Cylinder Pressure Sensor Input (kPa or psi): The scan tool displays 0-13,800 kPa (0-2000 psi). The scan tool displays 0 kPa (0 psi) when the brake is released.
Master Cylinder Pressure Sensor Input (Volts): The scan tool displays 0-5 Volts. The scan tool displays a minimum voltage of 0 Volts when the brake is released.
Mode LED: The scan tool displays On/Off. The scan tool displays On when the VSES is initialized.
Mode Switch: The scan tool displays Pressed/Released. The scan tool displays Pressed when the mode switch is manually pushed in.
MPA Switch: The scan tool displays Charged/Uncharged. The scan tool displays Charged when the medium pressure accumulator is fully charged.
MPA Charge Command: The scan tool displays Active/Inactive. The scan tool displays Active when an MPA charge is in progress.
MPA Charge Feedback: The scan tool displays Active/Inactive. The scan tool displays Active when an MPA charge is in progress.
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 displays 3-257 km/h (2-160 mph). The scan tool displays 3 km/h (2 mph) when the vehicle is not moving or is moving at speeds less than or equal to 3 km/h (2 mph).
Requested Torque: The scan tool displays 40-95%. The scan tool displays 40% when the EBCM requests the minimum percentage of available torque in an attempt to eliminate wheel slip.
RF Dump Valve Command: The scan tool displays On/Off. The scan tool displays On when the right front dump valve solenoid is commanded on.
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 3-257 km/h (2-160 mph). The scan tool displays 3 km/h (2 mph) when the vehicle is not moving or is moving at speeds less than or equal to 3 km/h (2 mph).
Stability System Active: The scan tool displays Yes/No. The scan tool displays Yes when the VSES is active.
Stability System Enabled: The scan tool displays Yes/No. The scan tool displays Yes when the VSES is initialized and no VSES related DTCs are set.
Steering Angle PWM 1: The scan tool displays 9-91% DC. The scan tool displays 9% DC as the minimum valid steering wheel position PWM signal.
Steering Angle PWM 2: The scan tool displays 9-91% DC. The scan tool displays 9% DC as the minimum valid steering wheel position PWM signal.
System Voltage: The scan tool displays 9.0-17.5 Volts. The scan tool displays the current battery positive voltage level at the EBCM.
Traction Control Active: The scan tool displays Yes/No. The scan tool displays Yes when the traction control system is active.
Traction Control Enabled: The scan tool displays Yes/No. The scan tool displays Yes when the traction control system is enabled.
Traction Control Equipped: The scan tool displays Yes/No. The scan tool displays Yes when the vehicle is equipped with traction control.
Traction Control Slip: The scan tool displays Yes/No. The scan tool displays Yes when the rear wheel slip occurs during acceleration.
Traction Off Lamp Command: The scan tool displays On/Off. The scan tool displays On when the traction off indicator is commanded on.
VSES Relay Command: The scan tool displays On/Off. The scan tool displays On when the VSES relay is commanded on.
Yaw Rate Sensor Input: The scan tool displays 0-5 Volts. The Scan tool displays 2.5 Volts when yaw rate is 0 deg/sec.
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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.