Removing and installing engine control unit J623 with protective housing, Eos — VW

Removing and installing
engine control unit
J623
with protective housing, Eos
Special tools and workshop equipment required
Electric cutter
V.A.G 1561 A
Saw set
V.A.G 1561/14
Grip pliers
Hot air blower from
wiring harness repair set
VAS 1978
Removing
Note
If the engine control unit is to be replaced, connect the
vehicle diagnostic tester
and carry out the guided function
“Renewing engine control unit”
.
Switch off ignition.
Remove windscreen wiper arms
Electrical system
Rep. gr.
92
Windscreen wiper system; Removing and installing windscreen wiper arms
.
Remove plenum chamber cover
General body repairs, exterior
Rep. gr.
50
Bulkhead; Removing and installing plenum chamber cover
.
Remove plenum chamber bulkhead
General body repairs, exterior
Rep. gr.
50
Bulkhead; Assembly overview - bulkhead
.
Note
The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.
Caution
Cover lines, cables, connections and control units in the vicinity of the engine control unit to prevent damage through heat.
Perform settings on hot air blower
4
as shown:
Turn potentiometer for temperature adjustment
2
to maximum heater output (600 °C).
Set two-stage switch for air quantity
3
to position 3.
WARNING
When shear-head bolts are heated up, parts of the protective housing will be subjected to a large amount of heat. Wear protective gloves to avoid injury.
Move nozzle of hot air blower towards shear-head bolt.
Switch hot air blower on and heat bolts.
Unscrew bolts using
grip pliers
.
Note
If the bolts cannot be unscrewed, saw into the heads of the shear-head bolts so that 2 parallel slots are created
arrows
. Then unscrew.
Insert screwdriver
A
between protective housing and retaining plate
arrow
.
Using screwdriver
A
, lever protective housing up and pull off to side from retaining plate
arrow
.
Release and detach front connector
1
from engine control unit.
Lever up catch
2
slightly.
Then push engine control unit out of retainer
arrow
.
Release and detach rear connector from engine control unit.
Installing
Connect and lock rear connector to engine control unit.
Push engine control unit onto retaining plate.
Connect and lock front connector to engine control unit.
Push protective housing onto retaining plate.
Evenly tighten shear-head bolts
1
until bolt heads shear off.
Fit windscreen wiper arms
Electrical system
Rep. gr.
92
Windscreen wiper system; Removing and installing windscreen wiper arms
.
Install plenum chamber cover
General body repairs, exterior
Rep. gr.
50
Bulkhead; Removing and installing plenum chamber cover
.
Install plenum chamber bulkhead
General body repairs, exterior
Rep. gr.
50
Bulkhead; Assembly overview - bulkhead
.