How to disable TCS on start - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 7 (permalink) Old 03-21-2005, 12:41 PM Thread Starter
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First let me say that I have NOT performed this mod, so I do not have any pictures or wiring diagrams for anyone. I do not plan on performing this mod since the default TCS ON behavior does not bother me. However, I recently came across a post that could possibly damage the ECU, so I decided to post my recommendation on how to turn off the TCS every time the car is started. The steps are below:

1. Leave the stock TCS switch intact.

2. Purchase an automotive relay.

3. Ground the negative power lead for the relay.

4. Wire the positive power lead to the positive lead of the solenoid on the starter.

5. Connect the two output leads on the relay to the two switched connections on the TCS switch. Make sure you are connecting the leads to the switched connections and not the power connections. The switch has two power leads which power the light built into the switch, you do not want to connect the relay to these two.

6. Mod complete.

What you just did:

Every time you start the car, the power sent to the starter will power the relay which will in turn mimic pressing the TCS switch on the dash. This will reverse the default nature of the TCS system which is by default ON after starting the car. To turn the TCS back on, press the TCS button.

This mod will leave the stock TCS switch intact, and will not risk damage to the ECU. I strongly recommend NOT performing this mod if you are not at least somewhat familiar with electronic theory, automotive electrical systems, and how to install a relay. Serious damage to your ECU could result if the relay is wired incorrectly. It is important to wire the relay to the proper power wire on the starter, you want the wire that is only powered when the key is turned to the starting position. A continuity tester would be a good way to verify this.

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post #2 of 7 (permalink) Old 03-21-2005, 06:43 PM
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I don't plan on doing this but incase anyone is ambitious enough to do this, I believe the wire diesel is refering to is the starter wire/crank wire. This wire is + only when you start/crank the car. And I believe this wire is the Black/Blue wire found in the ignition harness. But anyone trying this should test out the wire(s) before doing any mod. And another note, the power of this wire will have 12V when car is cranked, I don't know if the pulse current sent to the ECU from the TCS button has this much power or if it is less.

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post #3 of 7 (permalink) Old 03-21-2005, 11:42 PM Thread Starter
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Quote:
Originally posted by Vina6@Mar 21 2005, 11:43 PM
I don't plan on doing this but incase anyone is ambitious enough to do this, I believe the wire diesel is refering to is the starter wire/crank wire.* This wire is + only when you start/crank the car.* And I believe this wire is the Black/Blue wire found in the ignition harness.* But anyone trying this should test out the wire(s) before doing any mod.* And another note, the power of this wire will have 12V when car is cranked,* I don't know if the pulse current sent to the ECU from the TCS button has this much power or if it is less.
[snapback]381232[/snapback]

Vina6, thanks, I did not feel like looking under the car to see the color code. As far as the 12V pulse current, if the relay is wired properly, the current from the starter never reaches the ECU, the current from the starter will simply engergize the relay which in turn closes the loop coming from the ECU. ONLY the current output from the ECU will pass through the controlled leads on the relay and loop back to the ECU, NOT the current from the starter.

Usually a relay is used to allow a small control current to control a much larger switched current, it is possible to use it in reverse such as in this situation where a large control current (12V starter current) is controlling a much smaller current (ECU control signal).

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post #4 of 7 (permalink) Old 03-29-2005, 10:58 PM
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ill be doing this soon . i think your right on the color Vina , but ill have to make sure when i get under there .

only thing tho does the crank wire stay live long enough to turn the TCS off , is another question , i think it will work most of the time but in the winter somtimes the TCS stays off till the car warms up then it turns on by itself .


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post #5 of 7 (permalink) Old 03-30-2005, 12:05 AM Thread Starter
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I have never had that happen on mine, if that's the case, it would be a simple matter to solder a capacitor across the leads. Depending on cap size, the cap could provide 3-5 sec of discharge after removal of the charge current.

What makes you think the TCS is off on start, and comes on later? The light? I live in a warmer client, so it has never happened to me, but I don't see why Mazda would implement a feature like that. If anything the TCS would be more useful in a colder climate where there is a higher likelihood of ice and snow. If you are judging the status of the TCS based on the light, it is possible the light just takes longer to go out when the car is cold, however that is part of the self test, and does not necessarily indicate the status of the TCS.

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post #6 of 7 (permalink) Old 03-30-2005, 12:25 AM
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I forget what the exact reasoning behind it is but, yes, when the weather is cold enough the TCS starts in the off position when the car is started. Once the car warms up a bit, it turns back on.
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post #7 of 7 (permalink) Old 03-30-2005, 12:39 AM
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ok about the cap , do you know where i could get that ? radio shack? is there a part number for this .

i figure i would hook it up to the crank wire on the relay right ?

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