What are the fault codes p 1500 and p 1800 in the transmission system of cheetah?

P 1500 This fault code indicates that during the CCM self-test, the electronic control module detected that the generator FR terminal signal remained higher than 4.5 volts for more than 20 seconds. The fault causes include generator FR circuit open circuit between generator and electronic control module, generator fault, electronic control module (PCM or ECM) fault, etc.

The P 1800 intake manifold air control (IMAC) assembly is located between the intake manifold and the cylinder head. In order to improve the engine performance, each cylinder corresponds to two intake channels, one of which is always open, and the other channel is only opened when the speed is higher than a certain value (for example, 3000 rpm). The function of the IMAC executive motor is to open/close the valve disc of the gas path according to the instruction of the electronic control unit (ECU).