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Stubby79 · 11-03-2020, 05:07 AM

Some searching came up with this...

https://honda-tech.com/forums/honda-...oblem-2202829/

Which refers to the same engine you're running.

Seems code 48 refers to air/fuel ratio sensors - MAFs, MAPs.

Also seems the D15Z1 runs a wide-band O2. The wrong signal might trip the code 48.

Ok, so you've swapped in a different engine. Did you swap ECUs? Did you swap it with the exhaust manifold, complete with O2?

If you're running the original ECU, you need to be running all the original sensors. If you've swapped in the D15Z1 ECU, you need to make sure you're running the sensors that it's expecting to work with.

My guess is that you're running a wide-band o2 sensor with a non-wide-band ECU or vice versa.

I don't know how much and what else you've swapped in. I've only done this on a Geo Metro...where you swap in the long block and NOT the intake or exhaust manifolds and all their sensors, because silly things - like you're having - happen if you do.

Tell us some more details of how much you swapped in and didn't swap in.

PS: your engine is idling stupid low because your ELD problem. Dunno if it was that same thread or another, but it seems they decide idle speed based on the electrical demands...no ELD response, no reason to turn up the idle to compensate for electrical load.

There is is:
https://www.honda-acura.net/forums/d...-detector.html

11-03-2020, 05:07 AM	#2 (permalink)
Stubby79 Master EcoModder Join Date: Sep 2012 Location: Victoria, BC Posts: 1,747 Firefly EV - '98 Pontiac Firefly EV 90 day: 107.65 mpg (US) Little Boy Blue - '05 Toyota Echo 90 day: 33.35 mpg (US) BlueZ - '19 Nissan 370Z Sport 90 day: 17.19 mpg (US) Thanks: 75 Thanked 576 Times in 426 Posts	Some searching came up with this... https://honda-tech.com/forums/honda-...oblem-2202829/ Which refers to the same engine you're running. Seems code 48 refers to air/fuel ratio sensors - MAFs, MAPs. Also seems the D15Z1 runs a wide-band O2. The wrong signal might trip the code 48. Ok, so you've swapped in a different engine. Did you swap ECUs? Did you swap it with the exhaust manifold, complete with O2? If you're running the original ECU, you need to be running all the original sensors. If you've swapped in the D15Z1 ECU, you need to make sure you're running the sensors that it's expecting to work with. My guess is that you're running a wide-band o2 sensor with a non-wide-band ECU or vice versa. I don't know how much and what else you've swapped in. I've only done this on a Geo Metro...where you swap in the long block and NOT the intake or exhaust manifolds and all their sensors, because silly things - like you're having - happen if you do. Tell us some more details of how much you swapped in and didn't swap in. PS: your engine is idling stupid low because your ELD problem. Dunno if it was that same thread or another, but it seems they decide idle speed based on the electrical demands...no ELD response, no reason to turn up the idle to compensate for electrical load. There is is: https://www.honda-acura.net/forums/d...-detector.html Last edited by Stubby79; 11-03-2020 at 05:32 AM..