You have to know the dictionary meaning of the trouble B1690 Code and the dictionary meaning is basic meaning of the code but if you want to solve the problem of the engine, you have to know manufacture name and model number what you will get by reading the manual. However, the dictionary meaning of the code is B means Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 means MFG – Manufacturer Specific. 6 means Vehicle Speed Control and Idle Control System. 9 means Crankshaft Position Sensor Circuit Performance and 0 means Transmission Engaged At High Throttle Angle.