Do you own a Scion and have recently encountered a P0793 Code? This code is an intermediate shaft speed sensor “A” code that is detected by the ECM when certain conditions (a), (b) and (c) are met continuously for 5 seconds or more. These conditions include a vehicle speed of 50 km/h (31 mph) or more, a park/neutral position switch (STAR) being OFF, and a speed sensor (NC) of less than 300 rpm. The causes for this code can range from an open or short in the transmission revolution sensor NC (speed sensor NC) circuit, the speed sensor itself, or even the ECM. It’s important to be aware of the possible causes and solutions for this code in order to get the best possible outcome for your vehicle.
Causes and Solutions for the Scion P0793 Code
| Causes | Solutions |
|---|---|
| Open or short in transmission revolution sensor NC (speed sensor NC) circuit | Check the transmission revolution sensor NC (speed sensor NC) circuit for open or short |
| Transmission revolution sensor NC (speed sensor NC) | Diagnose and replace the speed sensor NC if necessary |
| ECM | Replace the ECM if necessary |
| Vehicle speed | Check the speed of the vehicle to make sure it is above 50 km/h (31 mph) |
Open or Short in the Transmission Revolution Sensor NC
When the P0793 code is detected, the first thing to check is the transmission revolution sensor NC (speed sensor NC) circuit for any open or short. This can be done by using a multimeter to check the resistance of the circuit. If the resistance is higher than it is supposed to be, then there is likely an open in the circuit. If the resistance is lower than it is supposed to be, then there is likely a short in the circuit.
Speed Sensor NC
The next step is to diagnose and replace the speed sensor NC if necessary. This can be done by using a scan tool to check the speed sensor and the vehicle speed. If the speed sensor is not working properly or the vehicle speed is not what it is supposed to be, then the speed sensor NC needs to be replaced.
ECM
The last step is to replace the ECM if necessary. This can be done by using a scan tool to check the ECM for any faults or errors. If the ECM is not working properly, then it needs to be replaced.
Vehicle Speed
Lastly, the vehicle speed should be checked to make sure it is above 50 km/h (31 mph). This can be done by using a scan tool to check the vehicle speed. If the vehicle speed is not what it is supposed to be, then the vehicle needs to be taken to a mechanic to be checked.
Conclusion
When a Scion P0793 Code is detected, it is important to be aware of the possible causes and solutions. Open or short in the transmission revolution sensor NC (speed sensor NC) circuit, the speed sensor itself, or even the ECM can be the cause. Solutions include checking the transmission revolution sensor NC (speed sensor NC) circuit for open or short, diagnosing and replacing the speed sensor NC if necessary, replacing the ECM if necessary, and checking the vehicle speed to make sure it is above 50 km/h (31 mph). Taking the time to understand the Scion P0793 Code and the possible causes and solutions can help to ensure the best outcome for your vehicle.
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