Audi 1.8T

[gti]

Hello,

Has anyone done an Audi A4 1.8T with SM4?
This one has a cable throttle. Any ideas as how the ISC should be wired up please?
Does anyone have a base file please?

[boosted]

You can find a base file on the map download page ,I am doing a audi a4 with Sm2.You can copy the tables to your Sm4 :)

[gti]

Thank you. The Sm2 base file does not help me. What I really need to know is how the motorized throttle should be controlled.

[turboe36]

Wiring on the 7 pin throttle body connector:

1. actuator +12V/3A (idle control)
2. actuator PWM (idle control)
3. throttle closed = pin 7 / open = ∞
4. GND
5. TPS (0.6V closed / 4.3V full)
6. Not connected
7. +5V
8. Not needed (TPS with smaller range)

Not 100% sure on pin 4 and 7... they might be switched.

[boosted]

This signals correct
PIN 7 : 5v+ or TPS VCC
PIN 4 : Negative or TPS GND

[xr4tic]

According to my wiring diagram, Pin 7 is Ground, and Pin 4 is +5V

I was under the assumption the TPS had 2 outputs, a normal one, and a backwards one. Pin 5 may be the backwards one, but by flipping the polarity to the TPS, it works correctly.

Can the Autronic control the idle motor on the stock throttle body? If so, how does it get wired up?

[Kevin Black]

VAG runs the TPS "backwards" on these throttle bodies. This screws us in several ways if we are trying to use the idle motor.
The 2nd tps is a signal for the throttle only when controlled by the idle system. At idle, the switch going to pin #3 is closed and this tells the ecu to maintain stable timing and fuel.
But, since the switch gets +5v instead of ground, we have to figure out how to make this and the backwards TPS work with the Autronic.

If you do **not use the idle motor, all you need to do is wire it up with pin 4 gnd and pin 7 +5v (and pin 5 = tps)


I have started trying to control the idle motor in this throttle and also the 70mm V6 throttle. The control is not yet 100% yet in my opinion so I have not released it at this time. It is on my short list of things to get done in the next few weeks.

Kevin Black

[xr4tic]

Interesting, so do most people just add a different idle motor, or does it run OK without one?

[Kevin Black]

Most people use no idle motor and accept that the car idles too slow when cold, AC on etc. I'm tired of that lately and have been working on solutions/ talking people into installing idle motors.

[xr4tic]

Good to hear. I really don't want to lose functionality over the stock ECU, being able to incorporate the stock idle motor would be very nice.

Please let me know if/when you have a working solution.

[boosted]

Hey ,Kevin did you find a working solution for the idle valve?

[samvel]

Need help with Sm4 triggers wiring on VAG1.8T engine. We`ve wired cam sensor for sync as hall type and crank sensor as magnetic, but have strange problem. We have spark only at 1 cylinder (nr.2). Also sync/cyl % value is jumpy. We are using LS-1 coils wired directly to Sm4. What can be a problem?

[MRMRacing]

If its jumpy I would look over the crank sensor (is it 60-2?) and the sync sensor. Has the sync only one signal? Do you have 1.09 so you can scope the sensors?

[samvel]

crank is 60-2
sync is hall type. It seems that it gives 2 pulses, so % jumps at 2 values.
no, 1.07 and i do not have a scope :(

[Kelly2264]

If I remember correctly, the crank sensor wiring is...

1= +
2= -
3= shield

The numbers should be molded into the connector housing (look close, the numbers are TINY) on the harness side connector housing. If 1 and 2 are reversed you'll get the sync jumping all over the place. I found this out on mine and let me tell you, I was certain it was wired correctly. :o
I have to use a reluctor interface (SMC here), so mine isn't a direct connection to the ECU wiring like the SM4. ;)

One other thing, it triggers +Ve.

[samvel]

As i understand shield is not needed on magnetic sensor wiring, it`s just going to sensor ground. Only that matters is polarity. We`ve tested it both ways and we have tacho signal in Sm4.
Problem i think is sync/cam sensor that is hall type i think and looks very strange. I will upload a picture of it very soon...

[samvel]

http://www.es-tuning.ee/l2bu/stuff/IMGP0615.JPG
This is how VAG 1.8T camsensor looks like. Any help appreciated.

[Kelly2264]

As i understand shield is not needed on magnetic sensor wiring, it`s just going to sensor ground.

This is correct. I was just letting you know what all three wires are used for from the factory, so less guess work. ;)

Only that matters is polarity. We`ve tested it both ways and we have tacho signal in Sm4.


Mine had a tach signal as well, the problem was that with the sensor wired the wrong way around it puts the sync all over the place. Maybe someone can help here as to why this happens when a magnetic sensor is wired in reverse.

This is how VAG 1.8T camsensor looks like.
This is actually the "target" your sensor is looking for. You're going to need to modify this so there is only one "leg" left on the sensor target. See your manual as to where it will need to be at, degree wise. It's usually 10 degrees greater on either side of the trigger side of the missing teeth for the 60-2, if I'm not mistaken.

[xr4tic]

bump, any solution for the stock idle vavle?