The contact stated that while driving approximately 40 mph, the vehicle decelerated and rpm revved as the abs warning light illuminated. If the circuit suddenly goes open or shows a jump in resistance, you’ve found the fault. Tl-the contact owns a 2005 Jeep Grand Cherokee. Yes, you read that right Your TPMS may warn you that one of your tires do not have the correct air pressure level even if there is no real issue. Since most WSS problems are due to broken wires or loose or corroded wiring connectors, visually inspect the wires and use an ohmmeter or continuity tester to check the wiring while wiggling the wires back and forth. If all of the wheel speed sensors are generating a speed signal, and they all agree, the fault is not a bad WSS, but something else (possibly an intermittent wiring fault in one of the WSS circuits). So to check the WSS inputs, the vehicle needs to be driven in a straight line at 12 to 25 mph while you or a helper watches the wheel speed sensor PIDs on the scan tool. You can spin each wheel by hand to see if the WSS is generating a signal, but that won’t tell you if the signal is accurate or how one WSS compares to another. Most wheel speed sensors (except for the latest generation of “active” WSS sensors) won’t generate a readable signal until a vehicle is traveling 3 to 5 mph or faster. The scan tool will display a speed input in miles per hour (mph) for each wheel speed sensor. Most scan tools will allow you to not only read and clear the ABS codes that have turned on the ABS warning light, but to also look at the individual WSS inputs (Performance Information Data or PIDs).
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