Meaning of Code P1225
The electronic throttle control actuator consists of a throttle control motor, a throttle position sensor (TP), and other components.
The throttle position sensor (TP) responds to throttle movement and converts the throttle position into a voltage signal sent to the engine control module (ECM).
This system includes two sensors that function as potentiometers and also detect the opening and closing speed of the throttle. The ECM analyzes these signals to precisely adjust the throttle opening angle based on driving conditions.
Code P1225 is triggered when the learned closed throttle position value is excessively low.
Possible Symptoms
- Check engine light illuminated (or engine service soon warning light).
Possible Causes
- Faulty electronic throttle control actuator (TP sensor 2)
- Electronic throttle control actuator (TP sensor 2) harness open or shorted
- Poor electrical connection in the electronic throttle control actuator (TP sensor 2) circuit
Diagnostic and Repair Procedures
1. Visual Inspection
- Check the condition of the wiring harness and connectors associated with the electronic throttle control actuator.
- Look for damaged wires, broken, bent, pushed out, or corroded connector pins.
- Ensure electrical connections are secure and free from corrosion.
2. Electronic Throttle Control Actuator Check
- Use a digital multimeter to measure the voltage of the throttle position sensor (TP 2).
- Compare the obtained values with the manufacturer’s specifications.
- Replace the actuator if the voltage does not meet the recommended values.
3. Wiring Harness Check
- Test the continuity of the wires between the ECM and the electronic throttle control actuator.
- Check for the absence of short circuits or open circuits using a multimeter in ohmmeter mode.
- Repair or replace any faulty wiring.
4. Engine Control Module (ECM) Check
- If all previous checks are correct, advanced testing of the ECM module may be necessary.
- Consult a specialist or qualified technician for an in-depth diagnosis.
Conclusion
Code P1225 indicates a problem with the electronic throttle control actuator circuit, specifically the TP sensor 2. A thorough inspection of the harness, connections, and proper functioning of the electrical components will help identify and resolve the cause of the issue.