The A20A 86-89 Accord/Prelude PJ0 ECU had many revisions in different countries. Some of them will lack an O2 sensor or EGR control. However, they all use a vacuum advance distributor.
Most those ECUs were made by Matsushita. Some of them (86-87?)use an external 128k ROM.
The California Emissions PJ0 were OKI 80C154 based and always use a 128k External ROM
| Attachment?: | Modify: | Size: | Date: | Who: | Comment: |
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 PJ0-A03.jpg | mod | 282684 | 30 Jan 2006 - 06:54 | carotman | Canadian 89 Accord ECU. Made by Matsushita |
| PJ0-604-2.JPG | mod | 588048 | 30 Jan 2006 - 07:13 | carotman | EDM A20A4 no EGR and no O2 sensor from an 89 EX-i |
| PJ0_L022.JPG | mod | 212536 | 08 Feb 2006 - 22:55 | carotman | California Emissions PJ0 ECU. OKI based |
| PJ0-666-front.jpg | mod | 797657 | 29 Dec 2006 - 20:22 | carotman | USDM 86-87 Prelude SI PJ0 ECU |
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