<p>Hi and thanks for using Just Answer.</p><p> </p><p>From your description, it sounds as if you had a repair done to the vehicle which required disconnecting some of the wiring harness from under the hood and possibly other areas. Sometimes if rodents have chewed at the wiring harness and then the harness is moved it can make the damage caused by the rodents to become apparent. When rodents chew on the harness it creates the possibily of severe electrical damage from any bare wires touching other bare wires or metal from the engine. </p><p> </p><p>These types of problems almost always arise after a repair has been performed and the harness has been moved. Rodent damage to harnesses are not often visible immediately until after the harness has been moved or disconnected. </p><p> </p><p>However, if the battery would have been disconnected during the cambelt repair procedure, this problem might not have been found or this problem might not have occured. If the battery was not not disconnected, this would cause the harness to still have electrical current flowing through the wires and it is possible that when the wires were moved or disconnected this current caused the harness to short out and damage other components. </p><p> </p><p>I hope this answers your question and good luck!</p>

<p>The wiring harness is the electrical wiring that connects all of the electrical components for your vehicle.</p><p>The correct procedure for almost any repair is to disconnect the battery first then disconnect the harness as needed.</p><p>Yes the ECU could have been damaged by shorting out the harness if the battery was NOT disconnected prior to starting the repair.</p>