The Overvoltage Protection Relay protects against both overvoltage, which might be caused by a charging system fault and overcurrent (the fuse(s)) if something that it powers shorts.

Since it provides power to the KE injection system ECU, the idle control components (including the throttle valve switch (TVS) and idle air control valve) and the ABS control module, the telltale signs of an of an OVP relay issue are hard starting (all the cold start functions are in the electronic part of the KE system), no idle speed control, and illuminated ABS light.

Though this relay is supposed to protect against a system overvoltage or a downstream short, the relay itself appears to be much less reliable than than the changing system or components it is supposed to protect.

Duke