R34 Self Diagnostic

[kaitoukid]

Hey guys, need to run the self diagnostic on my R34, as I suspect my coilpacks are on the way out. As far as I am aware, the steps;

1. Turn ignition to ON

2. Connect the IGN and CHK terminals of the little box (e.g. with a paper clip) for 2sec

3. Check engine light (MIL?) should flash corresponding to whatever error code I have. 21 for ignition signal circuit I believe.

4. Repeat step 2 in order to "erase self-diagnostic results"

My query is about the 4th step. Essentially, does this actually clear the error code? Or just stop the self-diagnostic mode, so the MIL won't just continue flashing.

I.e. if I were to do the process again, would it still return the same error code as before (assuming nothing has been changed).

Just wanted to know in case I "clear" it but then want to run it again to double check the error code before doing anything.

Cheers for any input guys.

[kaitoukid]

Can't edit first post; so typing this.

I'm an idiot! Of course it will clear the error code; however when the same problem occurs it will return the same error code once again as nothing has been fixed -__-.

Admins feel free to close LOL.

Also used my mates scanner instead; got error code 21; looks like my coilpacks are on the way out indeed.

[DVS JEZ]

Yes very common for the coilpacks to bring up dtc 21 ignition circuit. Has ur car started to missire yet?

[kaitoukid]

Nah don't think it's misfired yet (or if it has, not too badly? Or I haven't noticed in any case). But light will come on usually a bit after driving (although if I've been driving, sometimes quite soon after turning on), and then I do feel some vibrations and engine sounds a bit off?

Also car is currently 96xxx... Seems about right for coilpacks bahaha.