1.4 TSI engine (EA111) · Mixture preparation – injection · Engine control unit J623

Engine control unit - J623-

6.12 Removing and installing engine control unit - J623- (Polo)

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

Removing

  • 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 - J623- is renewed, erase learnt values and adapt engine control unit ⇒ Vehicle diagnostic tester “Guided functions”.
  • Read event memory, rectify any faults and then clear event memory ⇒ Vehicle diagnostic tester “Guided fault finding”.
  • The readiness code must be generated if the event memory has been cleared.
  • Install air filter ⇒ 1.4 Removing and installing air filter housing (Polo).
  • Perform road test.
  • Read control unit event memory again.

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

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

Removing

  • Raise latch -1- and remove engine control unit -2-.
  • Unscrew shear-head bolts -1- using a pair of pliers.
  • Release connector from engine control unit and pull off.

Installing

  • Fit connectors and lock in position.
  • Push the protective housing over the 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 -2- into bracket on plenum chamber bulkhead until it audibly engages in latches -1-.
  • If engine control unit - J623- is renewed, erase learnt values and adapt engine control unit ⇒ Vehicle diagnostic tester “Guided functions”.
  • Read event memory, rectify any faults and then clear event memory ⇒ Vehicle diagnostic tester “Guided fault finding”.
  • The readiness code must be generated if the event memory has been cleared.
  • Install air filter ⇒ 1.4 Removing and installing air filter housing (Polo).
  • Perform road test.
  • Read control unit event memory again.