Toyota Motor said it would share plans in a month about overhauling its scandal-hit subsidiary Daihatsu Motor.

It received a rectification order this week regarding “procedural irregularities” from the Ministry of Land, Infrastructure, Transport and Tourism.

Production was stopped at Daihatsu’s four domestic plants in 2023 after an independent investigation found issues involving 64 models, 24 sold under the Toyota brand.

In a statement earlier this week, Daihatsu said: “We have betrayed the trust of all our stakeholders including customers.”

Last December it suspended shipments of its vehicles in and from Japan. Its offices were raided by the government, The Japan Times reported.

In April 2023, the Toyota subsidiary has admitted it had falsified data on models manufactured in Thailand and Malaysia from 2022 to 2023. An internal investigation found that false data stretched back as far as 1989.

In a statement Toyota said: “Toyota will fully support Daihatsu not only in reviewing its certification operations but also in making fundamental changes in its corporate culture and management so that Daihatsu can once again be trusted and chosen as a company of choice.”

The ministry has begun proceedings to revoke type certification, which is required for mass vehicle production, for three Daihatsu models including the Gran Max.

An official decision was expected on 23 January 2024.