This document describes a reported “flat spot” issue affecting 150 series automatic turbo diesel vehicles. The issue manifests as a brief loss of power, typically occurring at around 2400 RPM, often during slight uphill climbs or under load at approximately 55-60 km/h.
Problem
- Intermittent loss of power, described as a “flat spot”.
- Occurs around 2400 RPM.
- Most noticeable at 55-60 km/h, especially when under load (e.g., going uphill).
- Some owners have reported the issue occurring at around 40 km/h or during acceleration.
- May be related to gear changes (potentially 5th to 4th).
Solution
While no definitive fix is provided, Toyota acknowledged the problem and performed tests. The issue is believed to be related to gear changes, possibly 5th to 4th, with the torque converter locking up or disengaging. An ECU update may potentially address the issue in the future, though no guarantees were made.
Relevant Actions
Contact the Toyota Customer Experience Centre (1800 252 097) to report the issue.
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