Volkswagen Workshop Service and Repair Manuals

Removing and installing anti-theft engine control unit   Note t  If you wish to renew the engine control unit, connect the vehicle diagnosis tester and perform the guided function „Renewing engine control unit“. t  The shear-head bolt threads may coated with locking compound. To simplify removing, the shear-head bolts can be heated using hot air blower -VAS 1978/14-. When doing this, ensure that no adjacent cables, connectors or components are damaged! Removing –  Switch off ignition. –  Remove windscreen wiper arms → Electrical system; Rep. gr.92. –  Remove plenum chamber bulkhead → General body repairs; 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-.

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