Volkswagen Workshop Service and Repair Manuals

Removing and installing engine control unit -J623- with protective housing, Golf, Scirocco If the engine control unit is to be replaced, connect → Vehicle diagnostic tester and carry out guided function „Renew control unit“. Removing –  Switch off ignition. –  Remove windscreen wiper arms → Electrical system; Rep. gr.92 –  Remove plenum chamber bulkhead → General body repairs, exterior; Rep. gr.50.

–  Push retaining frame down in -direction of arrow- and remove engine control unit.

–  Unscrew shear-head bolts -arrows- using a pair of pliers.

–  Insert screwdriver between both locking plates -arrow-. –  Carefully press screwdriver in -direction of arrow- and bend retaining bar -1- upwards at the same time.

–  Bend retaining bar -1- in direction of -arrow- until it can be pulled off connector.

–  Push locking devices of connectors in -direction of arrow- and pull off connectors. Installing

–  Fit connectors to engine control unit and slide locking devices onto stop in -direction of arrow-.

–  Fit retaining bar -1- onto connectors and press it in direction of -arrow-. –  Guide pin -2- to stop into hole on valve timing housing.

–  Use new shear-head bolts to secure retaining bar onto engine control unit -arrows-. –  Evenly tighten shear-head bolts until bolt heads shear off -arrows-.

–  Locate engine control unit in retaining frame and push upwards in -direction of arrow-. –  Install plenum chamber bulkhead → General body repairs, exterior; Rep. gr.50. –  Fit windscreen wiper arms → Electrical system; Rep. gr.92.