| 摘要 |
PURPOSE:To prevent the occurrence of a battery exhaustion as well as to make a diagnosis troubleshooting ever so easy, by setting up a circuit feeding or intercepting the power to or from a memory according to the on-off state of an ignition switch and the presence of emergence of any trouble data there. CONSTITUTION:An operation circuit 2 is provided with an operation program and a trouble diagnostic program. Even when an ignition switch 4 is turned to OFF, power is still fed to a memory 3 from a battery 5 via a thyristor 7 and thereby memory data in the memory 3 continue to be held. Doing like this, in case trouble happens in a system, infallible repairs take place without delay by reading out the trouble diagnostic data stored in the memory 3. |
