Jonn investigated the ABS warning light on our 2002 Ford Thunderbird, starting by inspecting the connections at the ABS module. He disconnected the plug and examined the pins, all of which were clean and in good condition, before reconnecting the plug securely.
He then raised the car on the ramp and disconnected the rear wheel sensors. Using custom-made test leads, he connected a multimeter to check the resistance of each sensor, repeating the process on both sides. While spinning the wheels to observe resistance changes, Jonn noted that an analogue meter would have been better suited for this test.
Moving to the front, he removed the lower clips from the wheel arch liner to access and disconnect the front sensors. Testing revealed that the nearside front sensor was initially showing an open circuit. However, upon retesting, a resistance reading was present, rendering the results inconclusive. The offside front sensor and arch liner were refitted, and the nearside sensor was rechecked and reinstalled along with the associated trim.
Jonn noted that the only remaining diagnostic step would be to check continuity from the ABS module to each sensor, which would require assistance. Alternatively, the system needs to be connected to diagnostic equipment to retrieve fault codes and monitor live wheel speed data.
