I just bougt a 90 crx HF with a cr-vtec and it has a neptune EMS. I have a check engine light that comes on everyonce in a while, it doesnt affectt he car in anyway but how would I go about doing a diagnostic on the neptune ems to figure out what code its throwing?.This is my first rex with a swap so any help is appreciated

 

upity

 

You check it through the service connector as usual. If the service input mode is set to none, then follow the steps on neptune's site, http://www.hrtuning.com/pages/category/neptune

Service Input Allows you to change the service input to any other input or none at all. This frees up the service connector to be used as a switch for one of the other options. With "none" selected as the input, codes are shown with the car off key in the on position with the throttle over 65%