P0120 Mazda Code - Throttle Position Sensor Signal Out of Range
Quick Answer
The throttle position sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0120 Mazda indicates Throttle Position Sensor Signal Out of Range.
- Common causes
- Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0120 Mazda Description
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.
What are the Possible Causes of the DTC P0120 Mazda?
- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection
How to Fix the DTC P0120 Mazda?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0120 Mazda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0120 Mazda code?
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Frequently Asked Questions about P0120 Mazda Code
1. What are the common symptoms of OBDII code P0120 in a Mazda related to the throttle position sensor?
The common symptoms include poor acceleration, rough idling, stalling, and potential issues with shifting gears.
2. What are the possible causes of the P0120 code in a Mazda, indicating a throttle position sensor signal out of range?
The causes can vary but may include a faulty throttle position sensor, damaged wiring or connectors, or issues with the throttle body itself.
3. How can I diagnose the P0120 code in my Mazda related to the throttle position sensor?
You can use an OBDII scanner to read the code and perform a visual inspection of the sensor, wiring, and connectors. Testing the sensor's voltage output may also be necessary.
4. Can I drive my Mazda with the P0120 code indicating a throttle position sensor issue?
It is not recommended to drive your Mazda with this code, as it can lead to poor performance and potential safety hazards. It's best to address the issue promptly.
5. What are some repair tips for fixing the P0120 code in a Mazda?
Start by checking and cleaning the throttle body, inspecting the sensor and its connections, and replacing the throttle position sensor if necessary to resolve the issue.
6. Is it possible to reset the P0120 code in a Mazda without fixing the underlying issue?
While you can clear the code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent it from recurring.
7. How much does it typically cost to repair the P0120 code related to the throttle position sensor in a Mazda?
The cost can vary depending on the exact cause of the issue, but it may involve replacing the throttle position sensor, which can range from $100 to $300 including parts and labor.
8. Can a DIY enthusiast with basic mechanical skills fix the P0120 code in a Mazda themselves?
If you have the necessary tools and knowledge, you may be able to replace the throttle position sensor yourself. However, if you're unsure, it's best to consult a professional mechanic.
9. Are there any preventive measures to avoid the recurrence of the P0120 code in a Mazda after repair?
Regularly inspecting and cleaning the throttle body, checking the sensor connections, and ensuring proper maintenance of the throttle system can help prevent the code from reappearing.
10. How urgent is it to address the P0120 code in a Mazda once it appears?
It is recommended to address the issue promptly to prevent further damage to the engine and ensure optimal performance of your Mazda.
Discuss the causes and fixes for P0120 Mazda OBDII Code
-
I took the TPS sensor off to gain better access to behind the engine. Unknowingly, I reinstalled it without the knowledge that it needed to be installed a certain way with the spring loading. Long story short, the engine light went on and now I am trying to reinstall it the right way but cannot seem to do so to where the idle rests where it should. I am looking for tips to how to install it properly and what I should be considering when doing so. The car is a 98 Protege.
-
Try loosing the screws and moving the TPS until the idle start changing.
Here is the information from the service manual to test the sensor which could be used to adjust the sensor:
1. Detach the connector from the throttle position sensor.
2. Connect an ohmmeter between terminals IDL and E.
3. Insert a 0.004 in. (0.1mm) feeler gauge between the throttle stop screw and
stop lever.
4. Verify there is continuity between terminals IDL and E.
5. Insert a 0.024 in. (0.6mm) feeler gauge between the throttle stop screw and
stop lever.
6. Verify there is continuity no between terminals IDL and E.
7. Connect an ohmmeter to the throttle sensor terminals Vt and E.
8. Verify that resistance increases as throttle valve opening increase.
9. With throttle valve fully closed the resistance should be below 1 kilohm and
as throttle valve is fully opened resistance should increase to approximately 5
kohms.
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