MX5 NC cam trigger setting

[pattun@NC3]

Hello all

I just finished wiring of an Extreme ECU on a MX5 NC 2.0(LF-VE)

I do not know cam trigger setup to work on this engine. Wiring is maybe ok…

rpm trigger is setting to MAZDA3

 Wich trigger should i use on MX5 NC ?

[Adamw]

I suspect it will be the Mazda 3 pattern, which is 36-1-1-1 on the crank and 6 teeth on the cam.  What ECU do you have - can you do a triggerscope?

[pattun@NC3]

I have a G4+Xtreme.

I did triggerscope and got waveform that is the figure below.

but ,waveform is upside down compared  the figure in the service manual…

something  setting is wrong…?

[Simon]

Mazda 3 setup should do the trick, You might have to change the trig 1 edge to allow for the inverted signal. 

 

[pattun@NC3]

Thank You for tip!　I'll  I change  trigger edge falling to rising.

I have one more question.

I do not know the correct value of Trigger2 VVT offset.

I want you to tell me if you know about offset value.

 

[Simon]

For that you will be best to run the cam test function as this will give the best result. 

Cam Angle Test

 

The Cam Angle Test is a function designed to assist with diagnostics of VVT control position signals.  It can be used to determine the correct Offset value for a VVT Control Digital Input and assists with technical support inquiries.

 

The purpose of the Cam Angle Test function is to display the position in crankshaft degrees ATDC where each position pulse occurs. Cam angle test information can be found in the F12 runtime data menu.

 

Using Cam Angle Test

 

To activate the Cam Angle Test Function, perform the following steps:

 

1.	Ensure a Cam Position Digital Input has been wired and configured.

2.	Select the appropriate VVT Control Channel in the Cam Angle Test list.

3.	Select the Test Pulse Count.  This is the number of teeth on the cam trigger wheel (you can adjust this later if the number of teeth is unknown).

4.	Observe the cam teeth positions by looking at the parameter Cam Angle #X on the VVT tab of the Runtime Values window (F12 Key).

5.	Run the engine above the VVT RPM Lockout and ECT Lockout values.

6.	The position at which each cam pulse occurs will be displayed.

 

If the positions appear to be changing erratically, then the wrong Test Pulse Count may be selected.  Either adjust Test Pulse Count until the values become stable or disassemble the motor and count the teeth on the cam.

 

After the values have stabilised, the lowest Cam Angle #X angle value above 0.0 is the value that should be used for that VVT Control channels Offset value.  The cam will be in its relaxed position (ie not controlled) while the Cam Angle Test function is turned on.

 

 

[pattun@NC3]

Thanks for your reply.

I tried cam angle test,and I got the result of offset angle was 20 degrees.and set offset angle that value.
but,  inlet/LH posn is 32 egrees. incorrect offset value…？　cam test pulse is 6.

attached image was japanese,sorry…

 

 

[Simon]

You could try using the 559 offset and see if you still have errors.

[pattun@NC3]

Thanks for your reply.
change that value and try this weekend.

If there is any problem, please let me ask a question.

[pattun@NC3]

I tried the advertised content.
I Set 559deg to VVT offset,but inlet/LH signal error did not disappear.
Perform the cam test again, and set the offset value that 613deg. inlet/LH signal error was disappear.

Next, I tried changing the trigger1 and 2 edge setting  falling to rising. but no invert  signal.

And unfortunately no initial explosion at all …

 

 

Log 2018-04-29 1;01;24 pm.llg

G4+ Xtreme _mx-5_NCEC7.pclr