A system configured to detect faults in signal lines. A system includes a first component configured to communicate with a second component via a signal path including one or more signal traces. Sense signal lines are manufactured such that at some point they are in close proximity to a signal trace which is to be monitored. The sense signal lines are configured to use parasitic coupling to redirect a portion of a signal conveyed via a signal trace to a monitoring component. The first component is configured to convey a test signal indicative of a type of test via the signal path, and a reference signal to the monitoring component. The monitoring component is configured to utilize the reference signal to ascertain a presence or absence, or characteristics of a received redirected signal. The monitoring component may optionally utilize a locally generated reference signal.