Audi B8 S4 3.0 TFSI ECU Removal Guide
Precautions and notes before removing the ECU:
The ECU (Engine Control Unit) is a computer that controls your engine. You must have the ECU installed for your vehicle to function. Before removing the ECU, make sure your vehicle is in a safe location where it may sit, unattended, while the ECU is sent back and forth to APR. Be sure to leave the vehicle in park, or in gear, with the emergency brake on. Turn off the vehicle before proceeding and remove the key from the ignition. Disconnect the battery and do not reconnect the battery until the ECU is fully reinstalled. Also do not put the key into the ignition or attempt to start the car until the ECU's back in the car. Make sure you discharge any static electricity before handling the ECU and care when handling the ECU. Make sure the ECU is not subjected to extreme heat or cold, magnets, electrical shock, physical shock or liquids. Also do not attempt to open the ECU. When fully removed from the vehicle, be sure to package the ECU in a safe container for shipping with adequate packaging material. A static and or waterproof bag is ideal.
Alwasy remember to include your orderform and double check your contact information for accuracy!
Please note APR includes these instructions as a guide and is not liable for any mistakes made during the removal or installation of the ECU. Use common sense when handling the ECU and call APR if you have any questions. We are accessible at +1 (334) 502-5181. Also, if you are uncomfortable with removing your own ECU, APR's extensive dealer network can preform the work for you. Please visit www.goapr.com/dealer/ for a list of dealers near you. Thank you!
- Some engine control modules are not equipped with a protective housing. The removal and installation of the protective housing depends on the engine and transmission combination.
- The Engine Control Module (ECM) -1- is bolted to a protective housing - 5-.
- The protective housing must be removed to disconnect the connectors from the engine control module.
Removing
- Turn the ignition and remove the ignition key.
- Pull the plenum chamber cover rubber seal in front of the nut -1- slightly.
- Disengage the wiring harness -2- at the mounts -A-.
- Remove nut -1-.
- Remove the filler neck -3- with the filler tube from the washer fluid reservoir and the opening in the body.
- Remove the bolts -arrows- and the cover from the E-box.
- Release the retainers -arrows A- and remove the engine control module -J623--arrow B-.
- The engine control module -1- is secured in a metal housing -5- with retaining tabs -2- and shear bolts -3 and 4-.
- The threads of the shear bolts -4- (that are not screwed into the ECM) are coated with a locking compound.
- The threads on both ECM shear bolts -3- are not coated with locking compound.
- Remove shear bolts with locking pliers (see direction of -arrow-), or cut and slot the bolts.
- If slotting the sheer bolts, protect the windshield and surrounding area from sparks.
- Disconnect metal retainers from the ECM connectors.
- Disengage the connectors from the engine control module and disconnect the connector.
- Remove old ECM and install the ECM.
Installing
- Install in reverse order of removal.
- The ECM must be installed with a housing.
- Clean threaded holes for shear bolts of locking compound residue. Cleaning can be performed with a thread cutter (tap).
- Always use new shear bolts.
- Tightening specification: bolts for the E-box cover: 3.5 Nm
