MICROCOMPUTER FOR VEHICLE CONTROL

PROBLEM TO BE SOLVED: To provide a microcomputer for controlling a vehicle, dedicated to post-installation operation check, without the need for a terminal for the external connection nor the need for inclusion of a special testing function. SOLUTION: If a prescribed operation is executed normally in an initial check by a ROM 6 or RAM 7 immediately after turning on the power source of a microcomputer, a pulse signal PLS of a prescribed number is output from an output port O4 of a CPU 3 according to an operation monitoring program in the ROM 6. According to the rise of the pulse signal PLS, an operation monitoring pulse SVP with a short pulse width, which is not effective on the vehicle control is generated from a pulse generating part 9. The operation monitoring pulse SVP is superimposed on an injection control signal IJC for a fuel by an EXOR 10, and then a combined control signal CON is output. The combined control signal CON is converted into a prescribed level in an output part 11, and then output as a fuel injection pulse IJP. By measuring the operation monitoring pulse SVP superimposed on the fuel injection pulse IJP, the operation state of the microcomputer can be checked.