In India, such types of engines are used in Innova Crysta, Fortuner, and Hilux.
"The irregularities concern the smoothing of power and torque curves but did not lead to any over-stating or over-claims on horsepower, torque or other powertrain related values," a Toyota Kirloskar Motor (TKM) spokesperson said in a statement when contacted over the issue.
The company stated that the issue does not impact the emissions or safety of the affected vehicles.
"Toyota is working with relevant authorities to re-confirm the data used for the certification of the affected vehicles. As such, in the case of TKM also the dispatch of affected vehicles will be temporarily suspended," the automaker noted.
TKM would, however, continue to take new orders for the three models, it said. For cars that have already been dispatched but have yet to be delivered to the customer, the company will carefully explain this condition to customers, the company stated.
Thereafter, we will proceed with registration and delivery for customers who opt to receive their vehicles," it added.
It further stated: "We would like to reassure our existing customers by stating that we believe their vehicles are unaffected by these irregularities, as this did not result in any variations in horsepower, torque or other powertrain-related values." Additionally, this has not compromised the emissions or safety of their vehicles, TKM said.
"Nevertheless, TKM sincerely apologises for any inconvenience and concern this irregularity may cause to our customers and other stakeholders," it said. The Innova Crysta, Fortuner and Hilux account for around a third of TKM's total sales in India. Ten models using the affected engines globally, including six in Japan.