EXHIBIT 23.1


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the reference to our firm under the caption "Experts" and to the
use of our reports dated June 8, 2004, in Amendment No. 1 to the Registration
Statement on Form S-1 (No. 333-117274) and related Prospectus of Eagle Test
Systems, Inc. filed with the Securities and Exchange Commission on or about
August 12, 2004.








Chicago, Illinois                                          /s/ ERNST & YOUNG LLP
August 12, 2004