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As part of the anti-theft system on cars equipped with an engine immobilizer, the ECM box in the engine compartment is locked into place with a locking strip. The locking strip is installed with a security screw. See Fig 1. Mark up the center of the screw and drill a suitable hole for a screw puller. Insert screw puller and remove the screw. Remove the security strap across the control module box cover. Clean the control module box cover carefully so that no dirt or residue falls into the box when it is opened.

Fig 1: Locating Control Module Box In Engine Compartment
Courtesy of VOLVO CARS OF NORTH AMERICA.
Check that supply from main relay has been interrupted. Easiest method is to place fingertips on idle air control valve. When the valve stops vibrating, the main relay has cut off supply to the system.
Open ECM box cover and remove Motronic ECM (module nearest engine). See Fig 2.

Fig 2: Removing ECM
Courtesy of VOLVO CARS OF NORTH AMERICA.
Inspect connector pins and sockets for damage. Install ECM. Connect scan tool to DLC. See Fig 3. Switch on ignition. Read off any Diagnostic Trouble Codes (DTCs). Erase DTCs and reset adaptive functions using scan tool.

Fig 3: Locating Data Link Connector (DLC)
Courtesy of VOLVO CARS OF NORTH AMERICA.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Removal & Installation