Disconnect Negative Battery Cable Reset Computer. When removing cables remove negative first then positive. Ive always disconnected the neg cable and if youre looking to reset the ecu youll need to discharge the system even after you disconnect the battery I do this by hitting the brake pedal it tries to light up the tail.
To clear the computer you must remove all power from the system so that the codes are forgotten. Disconnect the negative battery cable using a 18 cm 34 inch spanner to loosen the battery cable. Select the fuse that is labeled ECM and remove this fuse.
The ECUECM will reset then test.
1989 Honda Civic wont start 1 Answers. How to reset a car computer without disconnecting. An old mechanics trick for turning for temporarily eliminating certain kinds of driveability problems is to disconnect the battery ground cable for 10 seconds to reset the computer. All this does is clear anything learned fuel trims shift settings etc.
