Civic HX Lean Burn "Econo" Light

[Chrysler kid]

Originally Posted by firehawk618

I have searched and searched and am probably missing it.

Can someone explain or post a link to installing a "lean burn" indicator?

Thanks!

You can not simply install one, you would need a jdm 3 stage vtec d15b and wiring and follow the instructions written by a member who has a 4 door green lx.

The best way to see if you are in lean burn is by monitoring the secondary 02 sensor to see when voltage reads 0. You can use a scan gauge or mpguino but it's also easy to tell with a vacuum gauge

Originally Posted by firehawk618

I am confused by this statement.

Can you clarify for me?

Thanks!

I wasn't sure what you meant with a CRV with abs and cruise control

[firehawk618]

Originally Posted by Chrysler kid

My best tank in my hx was 51 mpg all highway with no aero mods

I'm uploading pictures of the shift light mechanism and the plug, I put led lights in my srs and shift light and the modules were identical. So if you have the white plug that looks like the srs plug you should be able to plug it in and have a shift light

Please click thanks next to my post lol

I checked out the SRS and ABS modules. Unfortunately the ECU sends a ground to the bulb to illuminate it.

Those modules take a positive reference to turn them on.

I decided to keep my Cruise control light in tact. I'm certain that one would have worked fine as you indicated.


I ended up using my seatbelt light as the up shift light.

Works fine.

[Chrysler kid]

Originally Posted by firehawk618

I checked out the SRS and ABS modules. Unfortunately the ECU sends a ground to the bulb to illuminate it.

Those modules take a positive reference to turn them on.

I decided to keep my Cruise control light in tact. I'm certain that one would have worked fine as you indicated.


I ended up using my seatbelt light as the up shift light.

Works fine.

If it takes a ground to light up would the power readings from the secondary 02 sensor at 0 volts illuminate the srs light for a true lean burn indicator

[firehawk618]

Originally Posted by Chrysler kid

If it takes a ground to light up would the power readings from the secondary 02 sensor at 0 volts illuminate the srs light for a true lean burn indicator

No that works off millivolts and tapping anything into it will skew the readings.




Hmmm, since my wide band has an output I won't be using then what you say would be possible but not connected directly to a light. Simply too much current draw.

[Jakins]

yo. so I have my plug and my hx cluster from my old hx. but I dont know what to wire my 4 wires too. have we figured that out?

[firehawk618]

Originally Posted by Jakins

yo. so I have my plug and my hx cluster from my old hx. but I dont know what to wire my 4 wires too. have we figured that out?

When I get home I can pull up a schematic.

[Chrysler kid]

Originally Posted by firehawk618

When I get home I can pull up a schematic.

The picture of the back of my shift light makes me curious.

H/f white referring to the plug I'm assuming
eco green.

Can you post the y5 ecu schematics if you have them see if there was a pinout for the green plug

[firehawk618]

I think what the printed circuit is saying the shift light connector would be white.

Cruise control OR the eco light connector would be green.

Schematics to come.


EDIT: I cannot attach them they are too large.

PM me your email addresses and I will send them to you.

[firehawk618]

IF using the CC / Upshift lamp board there's really only 3 wires you need to worry about.

1. Power "should be yellow" and can be found by tapping into your SRS or ABS light connector. The wire should be the same color.

2. Ground "should be black" and can be found by tapping into your SRS or ABS light connector. The wire should be the same color.

3. The third wire is what triggers the light to come on. That one goes to pin A30 on the HX ecu *wht/red*. That wire from A30 also goes to the green plug just outside the ECU. IIRC that one is pin 5. The color will be the same *wht/red*


What I did on my car since I wanted to keep the CC light in tact and the SRS / ABS lights use a POSITIVE trigger vs NEGATIVE trigger is to just use my seatbelt light.

That light is always hot on one side and takes ground to trigger it.

Should the upshift light go through a ramp up module to keep the load off the ECU? I do not know. So far mine's been working fine.

I speculate the CC / Upshift / Eco light has a circuit board so it can dim with your factory dimmer. Do not hold me to that though.

If load on the ECU is a concern I would suggest using a LED in place of the bulb in the seatbelt indicator and a diode if necessary.

[Chrysler kid]

Does your eco light come on in 5th gear or is it just our dummy up shift light.

Reading up on the d15b ecu makes me want to see if I could plug and play one into the hx to control y5 lean burn