What do the fault codes p 1 122 and p 1 128 mean respectively?

1: fault code P 1 122 throttle motor-range/performance

In the Electronic Throttle Control (ETC) system, the throttle actuator is a stepping motor, which is responsible for controlling the throttle opening according to the instruction of the throttle control module. So P 1 122 indicates that the throttle control function is faulty.

2: fault code P 1 128 throttle motor-? Circuit short circuit

In the Electronic Throttle Control (ETC) system, the throttle actuator is a stepping motor, which is responsible for controlling the throttle opening according to the instruction of the throttle control module. Therefore, P 1 126 indicates an open fault in the throttle motor relay circuit.

References:

(1) Generally, cars equipped with microprocessor control units have fault self-diagnosis systems. It can be used to automatically check and monitor the working conditions of various parts of the internal transmission system and control system of the automobile.

(2) When the car breaks down, the failure indicator light installed on the dashboard will flash to remind the owner that there may be something wrong with the car. Press the button and the fault code will be displayed on the dashboard.

(3) At the same time, the fault signal will be stored in the memory. Even if the ignition switch is turned off, the fault is eliminated, and the fault indicator light is turned off, the fault signal will still remain in the memory for the maintenance personnel to judge the automobile fault. After troubleshooting, when the ECU is disconnected for 30 seconds, the fault code will be cleared.

(4) The automobile fault self-diagnosis system constantly monitors the operation of the automobile, even if a small screw is loose, it will be reflected, and hidden dangers will be found in time to ensure the safe operation of the automobile.

Baidu encyclopedia automobile fault self-diagnosis system