Ousted Nissan Motor Co. Chairman Carlos Ghosn is suspected of using a Nissan fund to reward an acquaintance who helped him deal with a personal investment that incurred a loss, sources said Saturday.

Ghosn allegedly paid $14.7 million to the Saudi Arabian acquaintance from Nissan's "CEO reserves," a fund pool intended for financing unexpected business operations not covered by the regular budget, they said.

The former Nissan chief, charged with underreporting his remuneration and who remains in detention, was served with a fresh arrest warrant Friday for transferring the private derivatives contract, which was incurring an appraisal loss of ¥1.85 billion ($16.6 million), to the Nissan account in a breach of trust.