{"id":682,"date":"2016-05-24T23:17:05","date_gmt":"2016-05-24T19:17:05","guid":{"rendered":"http:\/\/ff-squad.com\/wp\/?p=682"},"modified":"2025-08-26T09:49:10","modified_gmt":"2025-08-26T05:49:10","slug":"k-series-jdm-prc-prd-prb-ecu-info","status":"publish","type":"post","link":"https:\/\/ff-squad.com\/technet2\/k-series-jdm-prc-prd-prb-ecu-info\/","title":{"rendered":"K-series JDM PRC \/ PRD \/ PRB ECU info"},"content":{"rendered":"<p>Upon researching Type-S swap info on RSX base &amp; EP3 Civic Si vehicles, the optional use of JDM K-series ecu&#8217;s comes up often. Specifically, the JDM DC5 Type-R &#8220;PRC&#8221; or JDM EP3 Civic-R &#8220;PRD&#8221; ecu&#8217;s. These two ecus are ultra handy for use in legacy chassis (88-00 civic\/90-01 integra) K-swaps, being it lacks an immobilizer which all US K-series ecu&#8217;s have. This saves money for the K-swap end-user (temporarily) in not having to KPRO the ecu right off the bat in order to get the vehicle running and driven around.<\/p>\n<p>For 02-04 RSX &amp; 02-05 EP3 Civic Si&#8217;s, some are inclined to use the JDM PRC\/PRD ecu for whatever reason and typically experience the no-fuel-pump-priming issue, which is an easy fix. Simply swapping pin E1 down to E10 fixes this issue. I had to do the same in my K-swapped EG when I would switch between my KPRO&#8217;d PRD ecu and AEM 1030 EMS (RSX-S ECU).<\/p>\n<p>Here are some known differences in the factory programming for PRC\/PRD vs. PRB ecu&#8217;s:<\/p>\n<ul>\n<li><strong>FUEL PUMP RELAY<\/strong><br \/>\nPRC\/PRD fpr is located at ecu connector E10<br \/>\nPRB fpr is located at ecu connector E1<\/li>\n<li><strong>IMMOBILIZER SYSTEM<\/strong><br \/>\nPRC\/PRD disabled\/non-existent<br \/>\nPRB enabled<\/li>\n<li><strong>VTC MAPS<\/strong><br \/>\nPRC\/PRD is programmed for K20A Type-R camshafts<br \/>\nPRB is programmed for K20A2 camshafts \/ 05-06 PRB is programmed for K20Z1 camshafts (similar to Type-R cams in many ways)<\/li>\n<li><strong>FUEL &amp; TIMING MAPS<\/strong><br \/>\nPRC\/PRD are programmed for premium higher octane rated fuel (higher than 93)<br \/>\nPRB programmed for US rated octane fuel (91-93)<\/li>\n<li><strong>FUEL INJECTORS<br \/>\n<\/strong>All three ecu&#8217;s are programmed for 310cc injectors<\/li>\n<li><strong>OXYGEN SENSORS<\/strong><br \/>\nAll three ecu&#8217;s share the same dual 02 sensor configuration ie. wideband primary 02 and narrowband secondary 02<\/li>\n<li><strong>VSS (VEHICLE SPEED SENSOR)<br \/>\n<\/strong><span style=\"color: #ff0000;\">*<\/span>PRC\/PRD programmed for low frequency VSS (mechanical style mounted on rear of trans)<br \/>\nPRB (02-04) same as PRC\/PRD .<br \/>\nPRB (05-06) programmed for high frequency VSS (located on front side of trans)<br \/>\n<span style=\"color: #ff0000;\">*<\/span>I don&#8217;t believe Honda of Japan ever released a high frequency version VSS specifically for the DC5\/EP3 Type-R&#8217;s unlike the US 05-06 RSX. Honda did introduce the high frequency style VSS&#8217;s on the 06-10 FD2 CTR though, which used a whole different style ecu altogether (drive by wire, etc).<\/li>\n<li><strong>SPEED LIMITER<\/strong><br \/>\nPRC\/PRD set somewhere between 110-120mph<br \/>\nPRB no speed limiter<\/li>\n<li><strong>VTEC PRESSURE SWITCH SENSOR<\/strong><br \/>\nPRC\/PRD disabled<br \/>\nPRB enabled<\/li>\n<li><strong>6-SPEED ECU<\/strong><br \/>\nAll three ecu&#8217;s are programmed for K transmissions with a 6-speed gear selector<\/li>\n<\/ul>\n<p>There may be other slight differences I have yet to discover (ie. multiplexor) and will update if I come across these things.<\/p>\n<p>Now, seeing the list of differences, here are some caveats of using a PRC\/PRC ecu in an 02-04 RSX Type-S or K20A2 swapped 02-04 Base RSX &amp; EP3 Civic Si:<\/p>\n<ul>\n<li>Fuel pump relay &#8211; fuel pump pin out E1 needs to be swapped to E10 or no fuel pump activation will occur<\/li>\n<li>No immobilizer &#8211; no need to reprogram your RSX\/Civic Si key!<\/li>\n<li>VTC maps are programmed for K20A Type-R cams NOT K20A2 cams &#8211; performance will lack because of this &#8211; engine will run regardless but not at its optimum VTC (unless you swap in K20R or K20Z1 camshafts)<\/li>\n<li>Fuel &amp; timing maps are programmed for Japanese higher octane pump gas &#8211; performance will lack because of this<\/li>\n<li>Speed limiter &#8211; can&#8217;t do anything about this!<\/li>\n<li>02 sensor(s) &#8211; make sure to use a Type-S primary (wideband) and secondary 02 sensor(s). RSX base and EP3 Civic Si primary 02 sensor is not compatible with PRC\/PRD programming (may throw cel or just run like crap)<\/li>\n<li>VTEC pressure switch &#8211; will not be a problem even though K20A2&#8217;s are equipped with this sensor<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Upon researching Type-S swap info on RSX base &amp; EP3 Civic Si vehicles, the optional use of JDM K-series ecu&#8217;s comes up often. Specifically, the JDM DC5 Type-R &#8220;PRC&#8221; or&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,99,243],"tags":[138,152,154,45,155,101,128,150,151,111,153],"class_list":{"0":"post-682","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ecu-wiring","7":"category-k-series","8":"category-k-series-tech","9":"tag-civic-type-r","10":"tag-dc5","11":"tag-dc5r","12":"tag-ecu","13":"tag-ep3","14":"tag-k20a","15":"tag-k20a2","16":"tag-prc","17":"tag-prd","18":"tag-rsx","19":"tag-rsx-r"},"_links":{"self":[{"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/posts\/682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/comments?post=682"}],"version-history":[{"count":1,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/posts\/682\/revisions"}],"predecessor-version":[{"id":2239,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/posts\/682\/revisions\/2239"}],"wp:attachment":[{"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/media?parent=682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/categories?post=682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ff-squad.com\/technet2\/wp-json\/wp\/v2\/tags?post=682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}