This document outlines troubleshooting steps and a potential solution for high engine RPMs in a Toyota Land Cruiser Prado 120 series diesel automatic, particularly when associated with cruise control issues and a stiff accelerator pedal.
Problem
The vehicle experiences abnormally high engine RPMs at highway speeds. Symptoms include:
- Increased RPMs at specific speeds (e.g., 2,700 RPM at 100 km/h when it should be 1,900 RPM).
- Cruise control cutting out intermittently.
- A stiff or firm accelerator pedal.
- Issue is intermittent, sometimes resolved by restarting the vehicle.
Solution
The most likely cause is a faulty accelerator position sensor (APS) unit within the accelerator pedal assembly. Replacing this unit should resolve the high revving and stiff pedal issues, especially when linked to cruise control malfunction.
Relevant Parts
- Accelerator Pedal Assembly / Accelerator Position Sensor (APS). Part number required (check with Toyota).
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