Question about Volkswagen Jetta

1 Answer

I own a 1994 Volkswagen Jetta III GL, 2.0 Liter, 4Cylinder SOHC. About two weeks ago my fiancee was driving the car and claimed that the speedometer and tachometer were working intermittently. She described them as reading zero and then suddenly surging on before reading normally. After a couple of days of this they began working normally again for about a day and a half. At this point they simply shut off entirely and read zero until this morning. During this time I took the time to remove the instrument cluster and examine the wires that connected directly, and also to examine the cluster itself. Nothing was obviously out of place or broken; no evidence of burning or cracking, etc. Anyone have any idea what my problem could be, or would anyone be able to get me what I need to fix it? If I can't fix it myself I plan on taking it in to the dealer and learning what I can without paying any money...

Posted by on

  • 1 more comment 
  • Nathan Danks Aug 02, 2010

    I've considered the possibility that it is one of the speed sensors, however Accums Razor doesn't seem to agree, correct me if I'm wrong. To my knowledge the wheel speed sensors feed the ECM information about how fast the car is moving, which the ECM then uses in turn to power things like the speedometer, cruise control, and ABS. If the speed sensors are faulty, then I would expect other car functions which rely on information about the vehicles speed to fail, but they do not; cruise control works as well as ABS.

    In addition the tachometer is no longer working as well. Unless the speed sensors are somehow integral to tachometer information and display then I must have had simultaneous failure of two separate parts, which doesn't seem likely to me. Any other things that it could be?

  • Nathan Danks Aug 02, 2010

    Right, that's my point, if the ECM does not know what vehicle the speed is doing, it will not be able to tell the other components what to register. The cruise control which relies on speed information from the ECM, which in turn relies on speed information from the vehicle speed sensors is functioning properly.

    Also, a faulty vehicle speed sensor does not explain the failure of the tachometer.

    Is there any possibility it could be a faulty electrical ground or could the instrument cluster (a single integrated instrument cluster controls the speedometer gauge, tachometer gauge, fuel gauge, and temperature gauge.) itself be failing.

    Note: the fuel and temperature gauge appear to be working properly.

  • Nathan Danks Aug 02, 2010

    To answer the questions that you asked, there is an ABS light. The warning lights appear to be functioning normally, but that's something that I have not looked into as thoroughly as I could have. In addition the blinkers (also part of the integrated instrument cluster) are functioning normally.

    One thing worth noting is that the Odometer does not go up; which would make sense if the module which controls the odometer does not know the vehicles speed. Prior to the failure of the speedometer the odometer was working properly.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Volkswagen Master
  • 1,675 Answers

Hi this sounds more like one of the speed sensors might be u/s you have one on the rear hub and front hub, you can do this yourself if you have the tools, its a simple job of removing the old and putting the new in, Determine whether you need to replace the front or rear wheel speed sensor if you cant just replace both,place a jack under the car in the correct position and raise it. With the car supported, take off the tire and wheel assembly,detach the wheel speed sensor wiring connector just a small plug that goes into the hub area,use a wrench or a ratchet and socket set to loosen and detach the wheel bearing housing bolt. To remove the rear wheel speed sensor, you need to remove the nut from the stub axle,pull the wheel speed sensor out of the wheel bearing housing, if it is rusty, spray some wd40 on it and leave for a while, if that does not still make it come out, just litghtly tap it with a hammer to loosen it,Clean the area with a wire brush and lubricate it with lubricant wd40. You may want to cover the wheel bearing housing to prevent debris from entering the hole where the wheel speed sensor goes, or just put a piece of rag in the hole, Insert the new wheel speed sensor by pushing it in if it does not go in easy, clean around the hole some more, do not hit the new sensor as that will damage it, then just reinstall the components you removed. If you have a torque wrench, tighten the wheel bearing housing bolt to 70 inch pounds (8 Nm). hope that helps..phewww




Posted on Aug 02, 2010

  • 1 more comment 
  • steve morris
    steve morris Aug 02, 2010

    this is true, but if the ECM does not know what speed the vehicle is doing, it will not be able to tell the other components what to register do you have an abs light on dash? as they are a totally different entity from the speed sensors, the abs does not need to know how fast the vehicle is travelling, it needs to know how much pressure is needed to stop the vehicle, or how much to dampen the braking once the peddle is pushed, if the ECM is faulty then you should have an engine management light on the dash..do all the lights still come up on the dash and go out when running?

  • steve morris
    steve morris Aug 04, 2010

    ah..i think the reason why the odometer stopped working after the speedometer is that the ECM..or as well call them the ECU registers the fault of the speed sensor first, then, if after a while it does not sense the speed indicator is working it will then shut off things that are integral with the speed sensor, hence the delay, have you retrieved the error codes for this? as they may tell you allot more than is being surmised, as it could be something as simple as a relay..this could be worth checking the ECM for fault codes...

  • Nathan Danks Aug 04, 2010

    There are no fault codes; there is no fault. The ECU is working perfectly. The ECU is getting good speed information. The cruise control is functioning.

    Even if it the speed sensor failed it does not explain the failure of the tachometer. Vehicle speed and engine speed are entirely different imputs...

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Ignition coil firing order for 2000 VW Jetta VR6


Jetta GL & Jetta GLS (two versions with 2.0 l and 115 CV engine)

2000 Volkswagen 2.0 liter SOHC L4 (AEG)

zjlimited_264.gif




Jetta GLS VR6 y Jetta GLX VR6 (2.8 l VR6 and 200 CV engine)

2000 Volkswagen 2.8 liter DOHC V-6 (ATQ)

zjlimited_263.gif


Hope helps.

Mar 22, 2011 | Volkswagen Jetta Cars & Trucks

3 Answers

What is the firing order for a1995 volkswagon Jetta, 5speed, 2.0 liter engine?


Hi!!
Firing order is 1 - 3 - 4 - 2, distributor rotates counter clockwise.
A HELPFUL Rating would be greatly appreciated. Thank you for using FixYa

Oct 18, 2010 | 1995 Volkswagen Jetta

1 Answer

How do you clear the codes in a 1994 Jetta III GL (OBDI) without the scanner?


remove the battery terminal for about an hour, when you reconnect put key in and turn engine of a few times engine ecu should reset, but only if there are no actual faults. ( rate me thanks )

Aug 30, 2010 | 1994 Volkswagen Jetta

1 Answer

I need to know cylinder location from left to right on 1999 jetta 2.0


1999 Volkswagen Jetta 2.0 liter SOHC L4 (ABA)

1e54e3b.gif


1999 Volkswagen Jetta 2.0 liter SOHC L4 (AEG)

36a2e7e.gif

Hope this help (remember rated this).

May 25, 2010 | 1997 Volkswagen Jetta

1 Answer

What is the firing order for a 1997 VW Jetta 2.0 liter.on the distrub. cap and on the engine?


Please don't forget to rate....thank you.

1997 Volkswagen Jetta
2.0 liter SOHC L4 (ABA)


b7794e3.gif

May 08, 2010 | 1997 Volkswagen Jetta

1 Answer

I need to know the fireing order for a volkswagen golf gl and what order it goes on the cap


1992 Volkswagen Golf 1.8 liter SOHC L4 (RV)

989717a.gif

Hope help with this; remember rated this post.

Apr 15, 2010 | 1992 Volkswagen Jetta

2 Answers

'94 VW Jetta III - clutch ''slipping''


I would have the clutch adjusted

Aug 01, 2009 | 1994 Volkswagen Jetta

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

393 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

yadayada
yadayada

Level 3 Expert

76070 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8266 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...