Volkswagen Workshop Service and Repair Manuals

Electrical and electronic components and their locations

1 -	Control unit for automatic gearbox -J217-

Do not remove until electric and hydraulic faults have been eliminated as sources.

q	Location → Fig.

q	Removing → Fig..

q	Installing → Fig.

q	Can be checked in “guided fault finding”.

2 -	Engine control unit

q	Location and removing and installing → Fig..

3 -	Diagnostic connection

q	Location → Fig.

4 -	→ Valve body

q	Location → Fig.

q	Removing and installing → Chapter

q	The → solenoid valves-N88-, -N89-, -N90-, -N91-, -N92-, -N93- and -N94- are attached to the → valve body.

q	Components can be checked in “guided fault finding”.

5 -	Conductor strip with integrated gearbox oil temperature sender -G93-

q	Location → Fig.

q	Removing and installing → Chapter

q	-G93- can be checked in “guided fault finding”

6 -	Multifunction switch -F125-

q	Location and removing and installing → Fig..

q	Can be checked in “guided fault finding”.

7 -	Gearbox speed sender -G38-

q	Location and removing and installing → Fig..

q	2-pin connector -T2- to wiring harness is white.

q	Can be checked in “guided fault finding”.

Do not interchange 2-pin connector -T2-, gearbox speed sender -G38- and driving speed sender -G68-!

8 -	Vehicle speed sender -G68-

q	Location and removing and installing → Fig..

q	2-pin connector -T2- to wiring harness is black.

q	Can be checked in “guided fault finding”.

Do not interchange 2-pin connector -T2-, gearbox speed sender -G38- and driving speed sender -G68-!

9 -	Throttle valve potentiometer -G69- or accelerator pedal position sender -G79-

q	More information → Anchor.

q	Can be checked in “guided fault finding”.

10 -	Selector lever lock solenoid -N110-

q	Location: the selector lever lock solenoid is located on the selector lever

q	Removing and installing → Chapter

q	Can be checked in “guided fault finding”.

11 -	Selector lever position display -Y6-

q	Location → Fig.

q	Simultaneous illumination of all selector lever position display segments indicates gearbox emergency running mode.

12 -	Cruise control system switch -E45-

q	Location → Fig.

q	Removing and installing → Electrical system; Rep. Gr.94.

q	Can be checked in “guided fault finding”.

13 -	Kickdown switch -F8-

q	Location in vehicles without EPC → Fig..

q	Location in vehicles with EPC → Fig..

q	Can be checked in “guided fault finding”.

14 -	Brake light switch -F- or brake pedal switch -F47-

q	Location and removing and installing → Fig..

q	Can be checked in “guided fault finding”.

15 -	Starter inhibitor and reversing light relay -J226-

q	Location → Fig.

Location of automatic gearbox control unit -J217- The control unit is located to right of centre in plenum chamber.

Removing automatic gearbox control unit -J217- –  Switch off ignition and open bonnet. –  Release multi-pin connector -arrow- and then pull multi-pin connector off control unit. –  Remove wiper arms and cowl panel → Electrical system; Rep. Gr.94.

–  Remove bolts. –  Remove control unit.

Installing automatic gearbox control unit -J217- Install in reverse order of removal.

–  First push connector onto pins of automatic gearbox control unit -J217--1- and then lock connector -2-. If engine or gearbox control units are replaced, the system must be returned to basic setting; performing basic setting → Chapter

Engine control unit Location: the control unit is located in left plenum chamber. For directions for removing and installing engine control unit, see t  → Repair group 20 t  → Repair group 23 t  → Repair group 24 If engine or gearbox control units are replaced, the system must be returned to basic setting; performing basic setting → Chapter

Diagnostic connection Location: the diagnostic connection is located behind the cover above the ashtray. Throttle valve potentiometer -G69- or accelerator pedal position sender -G79- On a petrol engine, the potentiometer is part of the throttle valve module -J338-. It is located on the throttle valve housing of the engine. On a diesel engine, the “throttle valve signal” is generated in the accelerator pedal position sender -G79-. This sender is located on throttle pedal. t  Petrol engine → Rep. Gr.24 depending on engine code t  Diesel engine → Rep. Gr.20 Important In vehicles with a data bus, the signal comes from the bus. In addition, the data bus interface in these vehicles must be checked. If the electrical signals in the vehicle → self-diagnosis for gearbox electronics are displayed as faults, then → self-diagnosis for engine electronics must always be performed. If the throttle valve potentiometer or accelerator pedal position sender has been renewed or its setting changed, basic setting of the engine control unit must also be performed. Locations:

The potentiometer is a component part of the throttle valve module -J338-. It is located on the throttle valve housing on the engine's intake manifold. Checking and adjusting or removing and installing throttle valve potentiometer → Rep. Gr.24.

The accelerator pedal position sender -G79--arrow-, a component of the electronic power control (-EPC-), is located on the pedal cluster. Checking and adjusting or removing and installing accelerator pedal position sender → Rep. Gr.20.

Selector lever position display -Y6- Location: in dash panel insert. In vehicles having a data bus, the display for the gearbox control unit is controlled by the diagnostic interface for the data bus -J533-. In emergency running with the gearbox control unit functioning, all segments in the selector lever position display in the dash panel will light up. In emergency running and with a defective gearbox control unit, there will be no display in the selector lever position display. Removing and installing selector lever position display → Electrical system; Rep. Gr.90

Cruise control system switch -E45- Location: switch is located on the steering column switch. Removing and installing cruise control system switch → Electrical system; Rep. Gr.94.

Kickdown switch -F8- in vehicles without EPC Location: kickdown switch -arrow- is integrated into accelerator cable and is located on bulkhead in engine compartment. Removing and installing kickdown switch –  To remove and install kickdown switch, remove accelerator cable then reinstall cable and adjust → Rep. Gr.20.

Kickdown switch -F8- in vehicles with EPC These vehicles have no throttle cable. Location: the kickdown switch -arrow- is integrated in the accelerator pedal position sender -G79-, where the kickdown signal is generated and a perceptible pressure point is created. –  Repairing accelerator mechanism → Rep. Gr.20.

Brake light switch -F- or brake pedal switch -F47- Location: both switches are located in a common housing on the pedal cluster. Removing and installing brake light switch or brake pedal switch → Brake systems; Rep. Gr.46.

Starter inhibitor and reversing light relay -J226- Location: relay is located on the relay plate on left behind dash panel. Relay is identified with the number -175-. Removing and installing dash panel trim → General body repairs, interior; Rep. Gr.70.

→ Valve body Location: → valve body is bolted to underside of gearbox housing and covered by pan. The → solenoid valves-N88-, -N89-, -N90-, -N91-, -N92-, -N93- and -N94- are attached to the → valve body. Removing and installing → valve body → Chapter

Conductor strip with integrated gearbox oil temperature sender -G93- Location: the conductor strip is located in the pan on the → valve body. The conductor strip can be renewed with gearbox installed without removing the → valve body. Removing and installing conductor strip with gearbox oil temperature sender -G93- → Chapter Do not kink or damage the conductor strip.

Multifunction switch -F125- Location: the multifunction switch is located on rear of gearbox. Removing and installing multifunction switch -F125- –  Pull connector off multifunction switch. –  Remove bolt and retainer. –  Remove multifunction switch. –  Always renew O-ring. Install in reverse order of removal. –  Insert switch so that 1 pin is resting on each ramp of the locking segment. –  Tighten bolt to specified torque → Item. –  Check and top up ATF level → Chapter.

Gearbox speed sender -G38- Location: gearbox speed sender is located top of gearbox “in the middle”. Removing and installing gearbox speed sender –  Pull white connector off sender. –  Remove bolt and pull sender out. –  Always renew O-ring. Install in reverse order of removal. Do not interchange connectors → Fig.. –  Tighten bolt to specified torque → Item. There are two versions of vehicle speed sender -G68-.

Version with cable Location: the sender with cable is located on top of the gearbox on the right. Vehicle speed sender -G68- without cable → Fig. With gearbox installed, the sender with cable is hidden by the left assembly mounting. Removing and installing sender with cable –  Disconnect battery earth strap → Vehicle electrics; Rep. Gr.27. –  Remove air filter.

–  Fit support device -10 - 222 A- with legs -10 - 222 A /1- and support engine with gearbox in this position. –  Remove bracket for power steering pressure hose.

–  Do not remove bolts for gearbox support -arrows- until gearbox has been supported.

–  Remove pendulum support.

–  Lower gearbox about 60 mm -a-. –  Pull black connector off sender. –  Remove bolt and pull sender out. –  Renew O-ring. Install in reverse order of removal. –  Tighten bolt to specified torque → Item. Torque settings for gearbox → Chapter Specified torque for pendulum support → Running gear; Rep. Gr.40

Vehicle speed sender -G68- without cable Location: the vehicle speed sender without cable is located on front of gearbox on right. –  Pull black connector off sender. –  Remove bolt and pull sender out. –  Renew O-ring. Install in reverse order of removal. –  Tighten bolt to specified torque → Item.