GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1860397  Size: SH
  1. Remove the underhood bussed electrical center (UBEC). Refer to Underhood Electrical Center or Junction Block Replacement .
  2. Remove the body wiring harness/engine wiring harness electrical connection clip from the UBEC bracket.
  3. Remove the UBEC bracket bolt and nuts.
  4. Remove the UBEC bracket.
  5. Disconnect the engine wiring harness electrical connector(s) (1) from the ignition coil(s) (4).

  6. Object Number: 860797  Size: SH
  7. Remove the ignition coil bolt(s).
  8. Remove the ignition coil(s).

Installation Procedure


    Object Number: 860797  Size: SH
  1. Install the ignition coil(s).
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the ignition coil bolt(s).
  4. Tighten
    Tighten the bolt(s) to 10 N·m (89 lb in).


    Object Number: 1860397  Size: SH
  5. Connect the engine wiring harness electrical connector(s) (1) to the ignition coil(s) (4).
  6. Install the UBEC bracket.
  7. Install the UBEC bracket bolt and nuts.
  8. Tighten
    Tighten the bolt/nuts to 10 N·m (89 lb in).

  9. Install the body wiring harness/engine wiring harness electrical connection clip to the UBEC bracket.
  10. Install the UBEC. Refer to Underhood Electrical Center or Junction Block Replacement .