P1123 FORD, LINCOLN, MERCURY: INTERMITTENT HIGH VOLTAGE IN THROTTLE POSITION SENSOR CIRCUIT
POST UPDATED IN June, 2023
P1123 FORD, LINCOLN, MERCURY: INTERMITTENT HIGH VOLTAGE IN THROTTLE POSITION SENSOR CIRCUIT
For the engine to run smoothly, the air/fuel mixture must be kept within optimum levels. The amount of air in the engine is controlled by the air intake system. The throttle body is installed in this system, which assists in controlling the air entering the engine.
The throttle body has a plate, which when closed prevents air from entering the engine. By the time the accelerator pedal is depressed, the plate opens allowing air to enter the engine, the amount of which depends on the position of the plate, which is controlled by the pedal. The harder the pedal is pressed, the more the throttle body opens, which translates into more power and speed.
The Throttle Position Sensor (TPS) is intended to inform the ECM (Engine Control Module) of the position of the throttle. With the information provided by this sensor, it is also possible to determine the amount of engine airflow and how much fuel needs to be injected for an ideal air/fuel mixture. If the Throttle Position Sensor circuit exhibits voltages that prove to be above the allowable voltages, the P1123 OBDII fault code will be set.
The reasons for the P1123 OBD2 diagnostic code being set are:
The steps to follow to correct the DTC P1123 OBDII code are: