Toyota DTC P1401 – Sub-Throttle Position Sensor Range/Performance Problem
DTC P1401 meaning on Toyota
DTC P1401 for Toyota indicates a Sub-Throttle Position Sensor Range/Performance Problem. This diagnostic trouble code is triggered when the engine control module detects that the sub-throttle position sensor is not operating within the expected range or is not performing as intended.
Toyota DTC P1401 symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Engine may hesitate or stumble during acceleration
- Increased fuel consumption
Toyota DTC P1401 causes
- Sub-throttle position sensor malfunction
- Wiring or connector issues in the sub-throttle position sensor circuit
- Faulty engine control module (ECM)
Toyota DTC P1401 seriousness
The DTC P1401 in a Toyota should not be ignored as it can lead to poor engine performance and potentially affect fuel efficiency. Ignoring this issue may also cause further damage to engine components over time.
How to diagnose DTC P1401 on Toyota
- Use a diagnostic scan tool to retrieve the trouble codes and freeze frame data
- Inspect the sub-throttle position sensor and its wiring for any visible damage or corrosion
- Check the sensor’s voltage and resistance values according to manufacturer specifications
- Test the sensor’s operation using a multimeter or oscilloscope
How to fix DTC P1401 on Toyota
- Replace the sub-throttle position sensor if faulty
- Repair or replace any damaged wiring or connectors in the sensor circuit
- If necessary, reprogram or replace the engine control module (ECM)
- Clear the trouble codes and perform a test drive to ensure the issue is resolved
How to erase DTC P1401 on Toyota
To erase the DTC P1401 on a Toyota, use a diagnostic scan tool to clear the trouble codes stored in the engine control module’s memory. After clearing the codes, perform a test drive to verify that the issue has been resolved and the Check Engine Light is no longer illuminated.
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