Cam/Crank Tooth Control Table

[LuisEcho]

Hi,

I would greatly appreciate some help trying to understand the Crank Tooth Control Table. I understand that the concept of the A-Tooth looks at a significant rising edge on the crank trigger and in order for this tooth to be considered a value of 5 must be set in the Control Table. I also read that for the reset of the complete engine cycle a value of 3 must be entered in the control table.

My question is why is there different values from 1-4 when using deferent setups in the Wizard? What do these other values mean?

[LuisEcho]

I have another question... I am planning on using this EMS-4 in a Toyota engine that has a 36-2 crank and 3 pulse cam home sensor with VVTI. Is there any problem if i put a value of 3 in the sync teeth this would be my complete engine cycle. I imagine i would also have to raise the Sync Error Reset to 7?

is there any other way of configuring the tooth offset for the car without using the Ignition timing Sync wizard? I have not found a location in the ECU where i can put in the tooth offset from BTDC to the crank sensor location...

Any help on this topic is greatly appreciated.

[SA]

Have you downloaded and installed AEM Tuner V2.5 yet?  If you have, there is an EMS-4 Tuning Manual installed in the Instructions folder.  It has a few examples of how to use the tooth control table and sync options.  This is the basic definition of the tooth control table options:

Code           Function
0      Do nothing.
1      Process significant edge.
2           Process alternative edge, used for crank firing.
3           Force reset of A_Tooth, if loss of sync.
4           Test for synchronisation
5           Process significant edge and Test for synchronisation.
6           Process alternative edge and Test for synchronisation
7           Reserved

Sometimes the functions change depending on the sync strategy though.  It's best to leave the setup of this table to the Wizards. 

[LuisEcho]

Yes I have downloaded the Manual and read it. It has some good examples but it does not explain many things it recommends the same thing you are witch is sticking to the wizard. My only problem is that the car i am working on is a 36-2 crank plus 3 cam home triggering system. Now it helps me allot your table value definition to understand the signals and their values in the A-Tooth table. So my question is I enter a value of three for the Sync Teeth and a 7 for sync error reset value.

Another doubt that i have is the tooth offset or angle between TDC and the crank sensor position for the ECU timing lock verification. Is the only way that this can be done is using the Ignition timing sync wizard.

Let me know thanks for your quick response.

[SA]

I think we have a base calibration for that engine.  As soon as I get a copy, I'll post it up so you can have a look.

[LuisEcho]

Excelent Thanks or a Lexus IS 300 has the same trigger setup if you have a base map for that it would help

[SA]

This file was converted from an older Series 2 EMS firmware version.  It was a running calibration file from a 2JZ VVT-I in a Toyota Aristo.  Use it for reference only.  The cam/crank edge setup options on the EMS-4 are different as you know from reading the manual. 

[LuisEcho]

Thanks

[LuisEcho]

Continuing with the same topic.. Does anyone know why on the A-Tooth table some trigger patterns start on the 0 a-tooth and others on 2 or 3 on most cases. Does this depend on tooth count division for the 24 tooth engine cycle conversion?

[RacingPiping]

Similar question actually...

I have a DOHC 6 cylinder that has 6 teeth at the crank itself, and 2 sensors at the front bank front camshalf (only one is being used).  The two sensors at the camshaft have 1 teeth (half-moon size; I believe it is 90 degree crank rotation) and the other has 6 teeth (equally spaced)

1st: which cam sensor would you use?  Most builders here want to modify the 1 tooth to make it smaller.  My logic is that the car was starting very well with the OEM ECU using those sensors;  why not understand the AEM EMS enough to make it understand the OEM logic??  I'm thinking that the 6 tooth evenly spaced, if used correctly, would be a better alternative... What are your thoughts on this?

What would be your picks on:


MX Sync Test
MX Time
Sync Teeth
Sync Error reset
Fuel Teeth
Wheel Teeth
Spark Teeth
Ign Range

Crank Tooth Control

I'm not listing what I did because... it's not working.  Honestly, I've been trying every combination I could think of, so far to no avail.

Add. Info:

V6 DOHC 2.5L Mazda 24V
MSD Dis4 hooked to 3 coil packs shooting at:

Coil 1: Cyl 1 and 4
Coil 2: Cyl 2 and 5
Coil 3: Cyl 3 and 6

Firing order:
1-2-3-4-5-6


Thank you for your help!

[1.8Miata1994]

Hi everyone,

what's the difference between (1 - Process significant edge) and (5 - Process significant edge and Test for synchronisation)?

What does (4 - Test for synchronisation) do?