4000,S L4-1781cc 1.8L SOHC (MG) (1985)
Engine Control Module: Technical Service Bulletins
ECU - Precautions
March 31, 1991
Electronic Control Units - Subsequential Damage
Model(s): All Models
Care must be taken when working on all vehicles equipped with electronic control units of any types. The following precautions should be followed to
assure that you do not inadvertently cause damage to these units during related repairs.
Always wait a minimum of 30 seconds after switching off ignition, before connecting or disconnecting a control unit from the vehicle electrical
Never disconnect a control unit from the electrical system, with the vehicle running.