Engine Control Module Malfunction Electric Throttle Control System Circuit
Table of contents
P1633 TOYOTA Possible Causes
- Fualty Engine Control Module (ECM)
- Faulty Electronic Throttle Control System (ETCS) Actuator
- Electronic Throttle Control System (ETCS) Actuator harness is open or shorted
- Electronic Throttle Control System (ETCS) Actuator circuit poor electrical connection
How do I fix code P1633 TOYOTA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- According to the Factory Service Manual, the Engine Control Module (ECM) is more than likely the cause of the problem.
Cost of diagnosing the P1633 TOYOTA code
The cost of diagnosing the P1633 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1633 TOYOTA Description
Electric Throttle Control System (ETCS) is composed of the throttle motor to operate the throttle valve, the electromagnetic clutch to connect the throttle motor with the throttle valve, the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position, the Engine Control Module (ECM) to control the ETCS and the one valve type throttle body.
The ECM controls the throttle motor to make the throttle valve opening angle properly in response driving condition.
The throttle position sensor which is mounted on the throttle body detects the opening angle of the throttle valve, and it provides feedback to the ECM to control the throttle motor.
If the ETCS has a malfunction, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.