Volkswagen Golf Variant / Jetta. Manual - part 440

 

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Volkswagen Golf Variant / Jetta. Manual - part 440

 

 

Engine Control Module

⇒ “4.1  Engine Control Module J623 without Anti-Theft Protection,

Removing and Installing, All Vehicles Except Jetta from MY

2011”, page 343
⇒ “4.2  Engine Control Module J623 with Anti-Theft Protection,

Removing and Installing, All Vehicles Except Jetta from MY

2011”, page 344
⇒ “4.3  Engine Control Module J623 , Removing and Installing,

Jetta from MY 2011 Only”, page 347

4.1

Engine Control Module - J623- without

Anti-Theft Protection, Removing and In‐

stalling, All Vehicles Except Jetta from

MY 2011

Special tools and workshop equipment required
♦ Vehicle Diagnosis System - VAS5051B-

Note

If the Engine Control Module - J623- is to be replaced, connect

the Vehicle Diagnostic Tester and perform the “Guided Functions,

Replace Engine Control Module”.

Removing:
Conditions
• Ignition switched off.
Procedure
– Remove the windshield wiper arms and the plenum chamber

cover. Refer to ⇒  Electrical Equipment; Rep. Gr.  92 ; Wind‐

shield Wiper System; Windshield Wiper Arms, Removing and

Installing .

– Remove the plenum chamber bulkhead. Refer to ⇒  Body Ex‐

terior; Rep. Gr.  50 ; Plenum Chamber Cover; Overview -

Plenum Chamber Cover .

– Remove the bolts -1- and remove the cover plate -2-.

4. Engine Control Module    

343

ule - J623- and remove it.

– Pry up locking mechanism -2- slightly.
– Then push the Engine Control Module - J623- in the direction

of -arrow- out of the bracket.

– Now release the rear connector from the Engine Control Mod‐

ule - J623- and remove it.

Installing:
– Connect and lock the rear connector to the Engine Control

Module - J623- .

– Slide the Engine Control Module - J623- onto the retaining

plate.

– Push the locking mechanism -2- against the Engine Control

Module - J623- .

– Now connect and lock the front connector -1- to the Engine

Control Module - J623- .

– Install the plenum chamber bulkhead. Refer to ⇒  Body Exte‐

Chamber Cover .

– Install the windshield wiper arms and the plenum chamber

cover. Refer to ⇒  Electrical Equipment; Rep. Gr.  92 ; Wind‐

shield Wiper System; Windshield Wiper Arms, Removing and

Installing .

– If the Engine Control Module - J623- was replaced, connect

the Vehicle Diagnostic Tester and perform the “Guided Func‐

tions, Replace Engine Control Module”.

– Check the DTC memory for the Engine Control Module - J623-

and erase all of the DTC entries. Refer to Vehicle Diagnostic

Tester “Guided Functions”.

– Perform a road test.

Note

Follow all applicable safety precautions during a road test. Refer

to 

⇒ page 303

 .

– Check the Engine Control Module - J623- DTC memory again.

4.2

Engine Control Module - J623- with Anti-

Theft Protection, Removing and Instal‐

ling, All Vehicles Except Jetta from MY

2011

Special tools and workshop equipment required
♦ Window Cutter - VAG1561A- with Blade Set - VAG1561/14-
♦ Hot Air Blower from Wiring Harness Repair Set - VAS1978B- .
♦ Vehicle Diagnostic Tester
♦ Locking pliers
♦ Safety Gloves

344

If the Engine Control Module - J623- is to be replaced, connect

the Vehicle Diagnostic Tester and perform the “Guided Functions,

Replace Engine Control Module”.

Removing:
Conditions
• Ignition switched off.
Procedure
– Remove the windshield wiper arms and the plenum chamber

cover. Refer to ⇒  Electrical Equipment; Rep. Gr.  92 ; Wind‐

shield Wiper System; Windshield Wiper Arms, Removing and

Installing .

– Remove the plenum chamber bulkhead. Refer to ⇒  Body Ex‐

terior; Rep. Gr.  50 ; Plenum Chamber Cover; Overview -

Plenum Chamber Cover .

Note

The threads of the shear bolts are equipped with locking com‐

pound. By heating the shear bolts using a Hot Air Blower -

VAS1978B- , the adhesive effect of the locking compound is

lowered.

Caution

Cover the wires, connectors and control modules in the area

surrounding the Engine Control Module - J623- to prevent any

burn damage.

Perform the adjustments on the Hot Air Blower - VAS1978B- -4-

as shown:
– Turn potentiometer for temperature adjustment -2- to maxi‐

mum heat output (600 °C (1,112 °F)).

– Move the two stage switch for air quantity -3- to position 3.

WARNING

By heating the shear bolts, parts of the protective housing are

heated intensely. Wear protective gloves to prevent injuries.

– Guide the Hot Air Blower - VAS1978B- nozzle on the shear

bolt.

– Turn on the Hot Air Blower - VAS1978B- and warm up the bolts

for approximately 20 to 25 seconds.

– Remove the shear bolt by the bolt head with pliers.
The procedure for the second shear bolt is exactly the same.
Do not let the bolts unscrew:

4. Engine Control Module    

345

surfaces -arrows- and then remove the bolts.

– Insert a screwdriver -A- between the protective housing and

the retaining plate -arrow-.

– Pry the protective housing upward using a screwdriver -A- and

pull it off sideways from retaining plate -arrow-.

– Release the front connector -1- from the Engine Control Mod‐

ule - J623- and remove it.

– Pry up locking mechanism -2- slightly.

– Then push the Engine Control Module - J623- in the direction

of -arrow- out of the bracket.

– Now release the rear connector from the Engine Control Mod‐

ule - J623- and remove it.

Installing:
– Connect and lock the rear connector to the Engine Control

Module - J623- .

– Slide the Engine Control Module - J623- onto the retaining

plate.

346

 

 

 

 

 

 

 

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