Removing and installing engine (motor) control unit - J623- with protective housing

When renewing engine control unit:

• Connect vehicle diagnostic tester.
• Perform function 0001 - Engine control unit renewal.

Removing

• Switch off ignition.

• Disconnect battery ⇒ Electrical system; Rep. gr. 27; Battery; Disconnecting and connecting battery.

• Open line guide -1- and raise catch -2-.
• Remove engine control unit from its bracket.

• Unscrew shear-head bolt -1- using a pair of pliers.
• Turn engine control unit -2- around and also unscrew second shear-head bolt using a pair of pliers.

• Pull bracket -1- and protective housing -2- off engine control unit -3- in -direction of arrow-.
• Release connector from engine control unit and pull off.

Installing

Install in reverse order of removal. Observe the following:

• Attach and lock connectors.
• Push protective housing over engine control unit.
• Install protective housing bracket with new shear bolts.
• Clean the threaded holes for the shear-head bolts of locking compound residues. A thread chaser is suitable for cleaning.
• Tighten shear-head bolts evenly until bolt head breaks off.

• Insert engine control unit into mounting bracket on plenum chamber bulkhead until it audibly engages in catch -1-.
• Press line into line guide -1- and close.
• Connect vehicle diagnostic tester.
• Select function 0001 - Entry in event memory.
• Clear event memory.
• Carry out road test.
• Read event memory again.

If engine control has been renewed:

Connect battery ⇒ Electrical system; Rep. gr. 27; Battery; Disconnecting and connecting battery.

• Connect vehicle diagnostic tester.
• Select function 0001 - Engine control unit renewal.