Volkswagen Golf Service & Repair Manual: Removing and installing engine control unit -J623- (with protective housing)
Special tools and workshop equipment
required |
|
|
|
Hot air blower -VAS 1978/14A--item 1-
with nozzle -2- from wiring harness
repair set -VAS 1978 B- |
Small grinder (commercially available) |
Vehicle diagnostic tester |
– |
If engine control unit is renewed, select test
sequence/function Replace engine control unit on “vehicle
diagnostic tester” in “Guided functions” mode. |
– |
Switch off ignition and remove ignition key. |
Note
t |
If the engine control unit comes into contact with the
positive battery terminal, the engine control unit will be
destroyed. |
Therefore, the battery must be disconnected before the
engine control unit is removed
→ Electrical system; Rep. gr.27. |
|
|
|
To remove protective housing -1-,
unscrew shear bolts -arrows- as
follows: |
Note
Cover the area around the engine control unit, and protect
it from flying sparks. |
|
|
|
– |
Make groove (for a screwdriver) in head of shear bolt
-1- using a small grinder
-2-. |
Note
|
|
|
The threads of the shear bolts are secured with locking
fluid. To unscrew these bolts, the threads must therefore be
heated with the hot air blower. |
– |
Select settings on hot air blower as shown in illustration,
i.e. set temperature potentiometer -2-
to maximum heat output and two-stage air flow switch
-3- to position 3. |
Risk of damage to adjacent components caused by hot air blower. Risk of
overheating.If necessary, cover adjacent components. |
|
|
– |
Heat head of shear bolt -1- for
approx. 20 to 30 seconds. |
|
|
|
– |
Unscrew shear bolt -1- using
screwdriver -2-. |
|
|
|
– |
Release fastener -arrow- and
detach engine control unit -1-. |
– |
Release and unplug connectors for engine control unit
-J623-. |
Installation is carried out in the reverse order; note the
following: |
– |
It is essential that the engine control unit -J623- be
provided with the protective housing again. |
– |
Remove any locking compound residues from the threaded holes
for the shear-head bolts. Threads can be cleaned using a tap
(thread cutter). |
– |
Use new shear-head bolts. |
After having installed the new engine control unit, the
following work must be carried out: |
– |
Connect battery
→ Electrical system; Rep. gr.27. |
– |
Connect vehicle diagnostic tester. |
– |
Switch on ignition and select the following menu options on
vehicle diagnostic tester: |
01 - Renew engine control unit |
|
|
|
Special tools and workshop equipment
required
Hot air blower -VAS 1978/14A--1-
with nozzle -2- fr ...
Other materials:
Removing and installing upper steering column trim
Special tools and workshop equipment
required
Removal wedge -3409-
Removing
–
Release locking lever of steering wheel pos ...
General description
Battery charger - VAS 5906-
WARNING
Danger of injury! Observe warning notices and safety
regulations
→ Chapter!
...
Temperature switch for evaporator -E33
Function:
The temperature switch for evaporator -E33- senses the
temperature between the cooling fins of the evaporator. It
prevents the possibility of ice forming between the evaporator
cooling fins by interrupting the current to the ai ...
© 2016-2024 Copyright www.vwgolf.org