The government has particularly asked ACB to probe the alleged irregularities in street light projects in which the Prime Minister-appointed Shunglu Committee had questioned certain decisions made by Dikshit.
"We will ensure thorough investigation of all cases of corruption in CWG projects," Law Minister Somnath Bharti said when asked about the government decision.
He said ACB has been told to examine all cases of irregularities but maintained that the probe will not target "any particular individual".
"The probe is not being carried out to target any individual. We will ensure a free and fair probe," he said.
The Shunglu Committee had found procedural violations by then Delhi Lt Governor Tejinder Khanna and Sheila Dikshit for alleged inadequacies in executing certain projects related to 2010 Commonwealth Games.
Sheila Dikshit had trashed the findings of the report and had sent a point-by-point rebuttal to the Centre.
After assuming charges, Chief Minister Arvind Kejriwal had announced that his government will investigate all corruption cases, particularly the CWG scam.
In the 70-member Delhi Assembly, eight Congress MLAs are giving outside support to the Aam Aadmi Party (AAP) government which currently has 27 MLAs after expulsion of rebel legislator Vinod Kumar Binny. The government has also been given outside support by a Janata Dal(United) MLA and an Independent.