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Old 01-10-2004, 01:20 AM   #1
MZM
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07 Legacy Spec B
Impreza 93 STI

Default Temp Gauge

The water temp gauges on my MY93 conversion are whacky. I am hoping some of you know how to correct this irrating problem. I have tried to attach some photos to help explain.

The car is rewired (by me) from a 1.8L to a imported EJ20t managed by an Autronic ECU. The computer is reading the two wire sensor correctly. But the single wire gauges are jacked. The stock gauge reads 0 as it should but with the key on and engine running, it immeadiately pegs hot.

The VDO gauge slowly rises to just less than 100 F as the engine fully warms. Anyone who can clue me why and what to do? Both the temp sensors are new and matched to the gauges.

Photos follow.

Mike McBride
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Old 01-10-2004, 01:33 AM   #2
MZM
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Default Stock key off

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Old 01-10-2004, 01:40 AM   #3
MZM
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Default Stock key on engine running

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Old 01-10-2004, 01:43 AM   #4
MZM
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Impreza 93 STI

Default VDO key off

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Old 01-10-2004, 01:44 AM   #5
MZM
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Impreza 93 STI

Default VDO warm engine

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Old 01-10-2004, 03:12 AM   #6
subiekid
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EJ22T/TEC3 & '12 Civic

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you should have just posted everything in one thread, instead of making 5 billion threads.
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Old 01-10-2004, 08:05 AM   #7
BAN SUVS
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Yes. Mods, can I get a merged thread goin here?
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Old 01-10-2004, 12:25 PM   #8
MZM
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Impreza 93 STI

Default Off topic complaint

subiekid viciously posted

Quote:
you should have just posted everything in one thread, instead of making 5 billion threads.
Well kid if I knew how I would have. Why don't you simply help instead of bitching?

I see a reply in my email that someone has replied to my sincere and serious question, and exitedly open the site to maybe solve a long term irratating problem and here is some belly acher without a mouse and nothing to say. Pointing out how to do what you want is a lot different than some iconoclastic outburst that is immature and distracting.

I hope you know as much about temp gauges as you do about site technique and hyperbole. 5 billion threads indeed.

Mike McBride
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Old 01-10-2004, 07:11 PM   #9
stimpy
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Don't worry, I took care of it.

To make multiple attachments, you have to make additional posts to your thread.

-Jon
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Old 01-10-2004, 07:19 PM   #10
stimpy
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Haha! That looks like my exact problem too:


I'm going to go out and measure the voltage coming off my thermometer in a couple days. I'll also try and have somebody take a measurement off their older EJ18 or EJ22 thermometer and see if i can find out what resistor we need to tone the temp gauge down some.

-Jon
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Old 01-11-2004, 08:29 PM   #11
MZM
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Impreza 93 STI

Default Thx

Appreciate the help in both areas; the site how to and what resister to use.

Since the instructions seem to limit total space on a thread to 51.2K, I thought one needed to use multiple threads to get in pictures, each almost 50K themselves. Thanks for the info, now I need to figure how to "shrink" pictures.

Jon, you may be aware that the stock wiring places two wires to the gauge, one from the single wire thermometer as well as another from the two wire engine temp sensor. The temp sensor wire (red/green in my car) also branches to the ECU.

Maybe this will help correct the erroneous reading.

Mike McBride
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Old 01-12-2004, 04:29 PM   #12
stimpy
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Mike, I just looked over all my diagrams and here are some observations I have about my 1996 (yours might be different):

There are two wires that go to the temperature gauge. One is the signal wire and the other is a ground. On my car, the signal wire is WG (just as it is on the WRX). The ground wire is RG. On the WRX, there is also only a single signal wire going to the gauges and the ground is handled elsewhere.

The engine coolant sensor (a seperate entity) is the exclusive supplier of temperature to the ECU. Neither signal wire splits and goes to the other. Therefore, the thermometer is the supplier to the water temp gauge on the gauge cluster and the coolant temp sensor is the supplier to the engine coolant temp on the ECU.

After examining the diagrams this morning, I did find a potential problem. The second wire, the ground in my case, traces back through the bulkhead wiring harness and grounds on the engine. The bulkhead wiring harness now terminates at that connector. It may be possible that I have overlooked this ground and my temperature gauge is not grounded. When I have some free time and some daylight I'll go in there and see if it is grounded.

Back to your problem at hand...
Does your VDO gauge utilize a seperate thermometer tapped into the coolant system or is it borrowing the signal from the existing thermometer?

-Jon
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Old 01-13-2004, 03:35 AM   #13
MZM
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Impreza 93 STI

Default Harness diagram

Hi Jon.

After your last message, I reviewed my shop wiring manual for the MY93 harnesses and it is the same as your MY96. The thermometer/temp sensor tie in I mentioned came from a Legacy Turbo diagram. I used it to get a hint of the turbo harness arrangement for the imported WRX engine I used. Remember this all happened prior to the WRX being sold here, so no WRX diagrams were available.

So if the gauge pegs when powered with the ignition key, could this mean it is not grounded properly? My gauge is grounded, but it does so via the sensor ground pin on the ECU. You mention the WRX is engine grounded, so is it possible the gauge with a turbo ECU can't read correctly thru the ECU ground, but needs a direct ground? Possibly because the resistance is different?

I am really dense about the details of electricity, ie resistance, ohms, amps, etc. I know just the basics and connecting "a" to "b". I can read a meter, but don't always know what it means.
Quote:
Does your VDO gauge utilize a seperate thermometer tapped into the coolant system or is it borrowing the signal from the existing thermometer?
The stock thermometer was replaced with a VDO unit, although it tested the same resistance cold. I think. This could affect the stock gauge I know, but not like it is acting presently. Maybe I just need a clean strong ground for these gauges to solve the problem. Your opinion?

I hope your car is progressing nicely now. Does your heater work? Thanks for your assistance.

Mike McBride
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Old 01-13-2004, 10:44 AM   #14
Jaxx
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Default

where is the temp gauge thermometer ?

is it the one in the water cross pipe under the manafold?
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Old 01-13-2004, 11:53 AM   #15
MZM
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Impreza 93 STI

Default Therm location

Quote:
Jaxx where is the temp gauge thermometer ?
is it the one in the water cross pipe under the manafold?
Both thermometer and sensor are in the water pipe you mention. At least on the models were are discussing. That is one reason it is so difficult to test or repair. These things are buried deep, requiring turbo removal to get good access. Even intake manifold removal sometimes. It hurts to think about it.

Mike McBride
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Old 01-19-2004, 02:56 PM   #16
stimpy
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I'll just go ahead and post in here in case you miss my other threads. I solved my temp gauge problem. It was, in fact, exactly what I had thought it was: a missing ground.

The temp gauge on the cluster grounds clear in the engine compartment and I had disconnected that section of wire.

-Jon
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Old 01-20-2004, 11:39 AM   #17
Faf
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stop to search it is the ground of your temp gauge from your cluster... just find the wire and ground it to the frame....

Faf
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