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acolvard · 12-10-2003, 11:43 AM

I am installing a USDM 97 h22a4 OBD2 into an 1988 Prelude. I am trying to determine what ECU to use, OBD2 or OBD1. I currently have a Place Racing OBD1 to OBD0 to OBD1 wiring harness. I can by an OBD1 ECU if i need to. I also have a full harness for the OBD2. Also the transmission has ATTS, does that effect ECU selection?

dohcvtec_accord · 12-10-2003, 12:47 PM

You'll need an OBD2 ECU, with ATTS capability, but you're going to have a hell of a time getting the ATTS system to work. Not because of the electronics, but because of the axles and halfshaft.

acolvard · 12-10-2003, 12:51 PM

Why are the axles a problem?

dohcvtec_accord · 12-10-2003, 12:54 PM

As far as I know, you'll need to get custom axles to fit the ATTS tranny and halfshaft.

ph8ed4life · 12-22-2003, 06:07 AM

I would say get a non ATTS tranny, go obd1 and switch out parts to make the engine obd1 (Injectors, distributor, etc.) This has been done before on 4th gen preludes, and I am in the first stages of prepping my h22a4 to be obd1 and dropping it into my 92 prelude

12-10-2003, 12:47 PM	#2
dohcvtec_accord WRX Sellout Join Date: Sep 2002 Location: The left lane Age: 32 Posts: 8,498 iTrader: 0 / 0% Ride: 2002 WRB Impreza WRX Rep Power: 99	You'll need an OBD2 ECU, with ATTS capability, but you're going to have a hell of a time getting the ATTS system to work. Not because of the electronics, but because of the axles and halfshaft. __________________ This space left intentionally blank.

12-10-2003, 12:54 PM	#4
dohcvtec_accord WRX Sellout Join Date: Sep 2002 Location: The left lane Age: 32 Posts: 8,498 iTrader: 0 / 0% Ride: 2002 WRB Impreza WRX Rep Power: 99	As far as I know, you'll need to get custom axles to fit the ATTS tranny and halfshaft. __________________ This space left intentionally blank.

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12-10-2003, 11:43 AM	#1
acolvard Junior Member Join Date: Dec 2003 Posts: 8 iTrader: 0 / 0% Rep Power: 0	I am installing a USDM 97 h22a4 OBD2 into an 1988 Prelude. I am trying to determine what ECU to use, OBD2 or OBD1. I currently have a Place Racing OBD1 to OBD0 to OBD1 wiring harness. I can by an OBD1 ECU if i need to. I also have a full harness for the OBD2. Also the transmission has ATTS, does that effect ECU selection?

12-10-2003, 12:51 PM	#3
acolvard Junior Member Join Date: Dec 2003 Posts: 8 iTrader: 0 / 0% Rep Power: 0	Why are the axles a problem?

12-22-2003, 06:07 AM	#5
ph8ed4life Junior Member Join Date: Dec 2003 Posts: 2 iTrader: 0 / 0% Rep Power: 0	I would say get a non ATTS tranny, go obd1 and switch out parts to make the engine obd1 (Injectors, distributor, etc.) This has been done before on 4th gen preludes, and I am in the first stages of prepping my h22a4 to be obd1 and dropping it into my 92 prelude

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OBD2 or OBD1?