This document addresses the issue of automatic transmission (A/T) overheating in the Toyota Prado, specifically the 150 series. It compiles information from owner experiences to provide potential causes, troubleshooting steps, and solutions.
Problem
The A/T oil temperature warning light illuminates under specific driving conditions. The engine temperature gauge remains normal. This occurs even in moderate ambient temperatures (10-15°C).
Conditions that Trigger Overheating:
- Slow forward speed (20-60 km/h)
- Gearbox in automatic mode or 4th gear.
- Steep inclines (on both bitumen and forestry tracks)
- Engine RPM around 2000
- Occurs when engine braking in 2nd/3rd gear downhill.
- Tough driving conditions include steep rocky hills, soft sand and deep bog holes.
Symptoms:
- A/T oil temp light illuminates.
- Possible hot oil smell.
- No noticeable engine overheating.
Solution
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Manual Gear Selection: Drive in manual mode, selecting a gear appropriate for the incline and maintaining RPMs above 2500. This helps lock up the torque converter and reduce slippage.
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Low Ratio: When safe and appropriate (low speed), engage low range.
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Software Update (Revised A/T Shift Mapping): Toyota has released a software update that revises the A/T shift mapping to reduce torque converter slippage during high engine torque operation.
HIGHLIGHT: Contact your local Toyota Service Centre to inquire about the A/T software update.
Relevant Parts
- Not Applicable
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