| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a diagnostic device capable of making diagnosis without deteriorating the running stability of a vehicle. SOLUTION: A comparator 26 has its state set in H, its counter 27 reset and clock started in its operation as a counter when a solenoid 3 is set in ON. It outputs a carry when the counter reaches its preset time T1. The carry is inputted into OR gate 28 and also after the carry is subjected to AND operation separately in two brake liquid pressure systems displayed by FRIN, FROUT and FLIN and FLOUT by means of a diagnostic judging circuit 31, it is subjected OR operation so as to be outputted to a select circuit 30. A check signal which shows the presence of diagnostic mode has been inputted in advance in a select circuit 30 so that the diagnostic result of each brake liquid pressure system may be outputted from an OUT terminal so as to be inputted into ABS(anti-lock brake system) control micro computer. Thereby, the diagnosis can be carried out in bundle for respective brake liquid pressure systems without making both two front wheels in their simultaneous pressure reduction modes, and also without deteriorating the running stability of a vehicle.</p> |
