Engine control unit - J623-

Removing and installing engine control unit ⇒ 2.1 Removing and installing engine (motor) control unit - J623-.

Removing and installing anti-theft engine control unit ⇒ 2.3 Removing and installing anti-theft engine control unit - J623-

2.1 Removing and installing engine (motor) control unit - J623-

If you wish to renew the engine control unit, connect the ⇒ Vehicle diagnostic tester and carry out the guided function “Renew control unit”.

• Switch off ignition.

Removing

• Switch off ignition.
• Release connectors on engine control unit and pull off connector.

• Press clips -arrows A- outwards and pull engine control unit out to side -B-.

Installing

• Insert new engine control unit and press to the left.
• Fit connectors and lock in position.
• If engine control unit is renewed, clear learnt values and adapt engine control unit ⇒ Vehicle diagnostic tester “Guided functions”.
• Read fault memory, rectify any faults and then erase fault memory: ⇒ Vehicle diagnostic tester “Guided fault finding”.
• The readiness code must be generated if the fault memory has been erased.
• Perform road test.
• Read control unit fault memory again.

2.3 Removing and installing anti-theft engine control unit - J623-

If you wish to renew the engine control unit, connect the ⇒ Vehicle diagnostic tester and carry out the guided function “Renew control unit”.

• Switch off ignition.

Removing

• Open wiring guide -1- and lift locking device -2-.
• Take engine control unit out of retainer.

• Unscrew shear-head bolt -1- using pliers.
• Turn engine control unit -2- over and unscrew second shearhead bolt using pliers.

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

Installing

• Fit connectors and lock in position.
• Push protective housing over engine control unit.
• Install retainer for protective housing using new shear-head bolts.
• Tighten shear-head bolts evenly until heads shear off.

• Insert engine control unit into control unit retainer on plenum chamber bulkhead until it engages audibly in catch -1-.
• Insert wiring into wiring guide -1- and close guide.
• If engine control unit is renewed, clear learnt values and adapt engine control unit ⇒ Vehicle diagnostic tester “Guided functions”.
• Read fault memory, rectify any faults and then erase fault memory: ⇒ Vehicle diagnostic tester “Guided fault finding”.
• The readiness code must be generated if the fault memory has been erased.
• Perform road test.
• Read control unit fault memory again.