This document details troubleshooting steps for a 2003 Toyota Prado 120 experiencing stalling issues around 40 km/hr, characterized by RPM drops and unresponsive acceleration.
Problem
The vehicle stalls intermittently at approximately 40 km/hr. The RPM needle drops unexpectedly, followed by a jump. Initially, there were no error codes reported by the dealer. Symptoms also included occasional lack of response when pressing the accelerator pedal.
Solution
- Check and/or Replace the Fuel Filter: A clogged or faulty fuel filter can cause fuel starvation, leading to stalling.
- Clean the MAF (Mass Air Flow) Sensor: A dirty MAF sensor can provide incorrect readings to the engine control unit (ECU), affecting fuel mixture and causing stalling.
- Check Transmission Oil Level: Incorrect transmission fluid level can cause stalling in automatic transmissions.
- Replace Throttle Body and Throttle Position Sensor: A faulty throttle position sensor can cause the engine to stall and may require replacing the entire throttle body.
Relevant Parts
- Fuel Filter
- MAF (Mass Air Flow) Sensor
- Throttle Body
- Throttle Position Sensor (TPS) - Often integrated with the throttle body.
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