{"id":309,"date":"2009-02-19T12:15:39","date_gmt":"2009-02-19T08:15:39","guid":{"rendered":"http:\/\/ff-squad.com\/wp\/?p=309"},"modified":"2024-11-15T11:26:18","modified_gmt":"2024-11-15T07:26:18","slug":"ckf-bypass-trick-3","status":"publish","type":"post","link":"https:\/\/ff-squad.com\/technet2\/ckf-bypass-trick-3\/","title":{"rendered":"OBD2 Civic\/Integra CKF Bypass Trick"},"content":{"rendered":"

UPDATE 9\/04\/18<\/strong><\/span>
\nUpdated some wording and typos.<\/strong><\/p>\n

UPDATE 10\/07\/09<\/strong><\/span>
\nA poster by the name of William pointed out and error with the CKF bypass trick information posted here, and well, it’s now time for yet another CKF revision! Not sure how or why my information on this was slightly off but this article has been revised and should have a lot less people wondering why this trick isn’t working for them (yet it does for others? weird). Anyways, what William pointed out will not only fix the Code 9 issues some of you are experiencing but is the right way in performing the CKF bypass altogether. Thank you William!<\/strong><\/p>\n

UPDATE 2\/19\/09 (now <\/b>superseded<\/b><\/span>)<\/b><\/span>
\nI’ve slightly revamped this page to better explain the CKF bypass trick due to the CEL 9 issue that has recently arisen. There are now two methods<\/span> you can perform – but – I HIGHLY suggest performing method 1 first then move onto method 2 (noted in red<\/span><\/strong>) if you get a CEL code 9 once you’ve tried method 1. If you’re not getting a CEL code 9 with method 1 there is no need to perform method 2<\/span> – otherwise you may give yourself CEL 54 or 9 if you apply method 2 when it is not required.<\/strong><\/p>\n

UPDATE 9\/3\/08<\/strong><\/span>
\n<\/strong>There have been reported CEL CODE 9 (CYP) issues once the CKF bypass trick has been performed on certain OBD2 civic\/integra vehicles. There is a fix for this problem which is explained within the procedures in RED<\/span> below.<\/strong><\/p>\n

NOTE: You DO NOT need to perform the new method if you’re NOT getting CEL code 9!<\/strong><\/p>\n

\n

SYNOPSIS<\/strong><\/h3>\n

This article describes how to trick a U.S. OBD2a\/b (96-01) Civic & Integra ecu into thinking a CKF sensor is wired in when there actually is no CKF sensor available.<\/p>\n

NOTE: This bypass trick does NOT WORK for 96-01 OBD2 preludes or 96-02 accord vehicles. This trick is strictly for OBD2 Civic\/Delsol\/Integra\/and CR-V vehicles.<\/p>\n

What is the CKF sensor?<\/strong><\/h3>\n

The CKF is the Crank Fluctuation Sensor<\/em>.
\nAll US 96-01 OBD2a\/b Honda\/Acura vehicles have this sensor that is integrated onto the oil pump. (CKF images soon)<\/p>\n

This trick is aimed to help hybriders who are using a US OBD2a\/b ecu in their vehicle (for whatever reasons) to manage the engine,\u00a0 yet the engine is lacking a CKF sensor.<\/p>\n

Here’s a few scenarios where this bypass trick comes in real f**kn handy:<\/p>\n

    \n
  1. When using a JDM OBD2 B-series engine in a US 96-01 civic\/integra powered by a US OBD2 ecu. JDM engines are not equipped with oil pump mounted CKF sensor like US OBD2 engines are<\/strong>. Some people want to stay smog + street legit. This bypass trick allows this very desired feature without needing to convert to OBD1. It’s also been proven that you CAN pass smog and the state REF (here in CA) while this mod is in performed – it passes the OBD2 scanner tool.<\/li>\n
  2. When using a US OBD2 B-series engine in a 92-95 Civic\/Integra powered by a US OBD2 ecu (via jumper harness adapter). Same info from above applies here.<\/li>\n<\/ol>\n

    For the unknowing – when using a US OBD2 ecu + the CKF sensor is not wired in, the engine will run like total crap<\/strong>\u00a0plus you’ll get a nasty CEL (code 54). This bypass trick basically taps the CKF into the CKP signal and rides the CKP signal essentially tricking the ecu. This bypass trick will save you time, money (around $300), and severe headaches!<\/p>\n

    \n

    OBD2a Civic\/Integra – 96-98 Civic \/ 96-97 Delsol \/ 96-99 Integra<\/strong><\/h3>\n

    Please refer to the ecu pin out page <\/strong>for the CKF pin location(s):
    \nOBD2a pin out schematics<\/a><\/span><\/strong><\/p>\n

    Get yourself 4 Scotch-lock\/tap splicers
    \nSometimes dubbed a ‘quick splice’, these can be real life savers. Grab 2 of these and a pair of pliers for the squeeze-splicing portion of the job:<\/span><\/strong><\/p>\n

    \"\"<\/a><\/p>\n

    Locate ECU connector ‘C’.
    \n<\/strong>Then look for pinout <\/span>C1 (CKFP) <\/span><\/strong>and<\/span> C4 (CYPP) <\/span><\/strong>in the orientation shown w\/the release tab facing upwards and wires leading into the back of the connector. U<\/span>sing the pliers, quick-splice these two wires together as shown.<\/span>
    \nNow, cut C1 (blue wire w\/red stripe) AFTER<\/span><\/strong> the quick-splice. This will sever the connection that leads to the actual CKFP sensor signal to the ECU and prevent conflicts with the ECU that may arise such as CEL 9 (CYP) and P1337 (CSF sensor no signal). <\/strong>This will allow C1\/CKFP signal to piggyback the C4\/CYPP signal without issue.<\/span><\/span><\/p>\n

    \"Locate<\/a> \"quick<\/a> <\/span><\/span><\/p>\n

    Now, on the same ‘C’<\/strong>\u00a0connector, locate pin <\/span>C11 (CKFM)<\/span><\/strong> and <\/span>C14 (CYPM)<\/span><\/strong> and quick-splice these two wires together as shown.<\/span>
    \nNow, cut C11 (white wire w\/red stripe) AFTER<\/span><\/strong> the quick-splice. Doing this will sever the connection that leads to the actual CKFM signal to the ECU and prevent conflicts with the ECU that may arise such as CEL 9 (CYP) and P1337 (CSF sensor no signal).\u00a0<\/strong>Ultimately, this will allow C11\/CKFM signal to piggyback the C14\/CYPM signal without issue.\u00a0<\/span><\/span><\/p>\n

    \"Locate<\/a> \"Quick-splice<\/a><\/span><\/span><\/span><\/span><\/p>\n

    FINALLY, RESET THE ECU BY UNPLUGGING THE ECU CONNECTORS FROM THE ECU FOR ONE FULL MINUTE OR PULL THE ECU BACKUP FUSE IN THE ENGINE BAY FUSE BOX FOR ONE FULL MINUTE TO CLEAR THE ECU’S MEMORY.<\/span><\/span><\/strong><\/p>\n

    That’s it! <\/strong>
    \nYour finished OBD2a quick-splice job should look something like this:
    \n
    \n<\/a>    \"OBD2a<\/a><\/p>\n

    \n

    OBD2b Civic\/Integra – 99-00 Civic \/ 00-01 Integra<\/h3>\n

    Please refer to the ecu pin out page <\/strong>for the CKF pin location(s):
    \n    OBD2b pin out schematics<\/a><\/span><\/strong><\/p>\n

    Locate the blue ecu connector ‘<\/strong>C’<\/strong>:<\/p>\n

    \"Locate<\/a><\/p>\n

    Locate pinout C22 (CKFP) <\/strong>and C29 (CYPP)<\/strong> in the orientation\u00a0shown – w\/the release tab facing upwards and wires leading into the back of the connector<\/span><\/span>. Using the pliers, quick-splice these two wires together as shown.
    \nNow, cut C22 (blue wire w\/red stripe) AFTER<\/span><\/strong> the quick-splice. Doing this will sever the connection that leads to the actual CKF sensor to the ECU and prevent conflicts with the ECU that may arise such as CEL 9 (CYP) and P1337 (CSF sensor no signal). <\/strong>Ultimately, this will allow C22\/CKFP to piggyback the C29\/CYPP signal without issue.<\/span>
    \n<\/span>
    \n    \"Locate<\/a>
    \n<\/a>    \"quick-splice<\/a>
    \nOn the same ‘C’<\/strong> connector, locate pin C30 (CYPM)<\/strong> and C31 (CKFM)<\/strong>. Quick-splice these two wires together as shown.
    \n Now, cut C31 (white wire w\/red stripe) AFTER<\/span><\/strong> the quick-splice. Doing this will sever the connection that leads to the actual CKF sensor to the ECU and prevent conflicts with the ECU that may arise such as CEL 9 (CYP) and P1337 (CSF sensor no signal). <\/strong>Ultimately, this will allow C30\/CYPM to piggyback the C31\/CKFM signal without issue:
    \n<\/span>
    \n    \"Now<\/a> \"Quick-splice<\/a><\/p>\n

    FINALLY, RESET THE ECU BY UNPLUGGING THE ECU CONNECTORS FROM THE ECU FOR ONE FULL MINUTE OR PULL THE ECU BACK-UP FUSE IN THE ENGINE BAY FUSE BOX FOR ONE FULL MINUTE TO CLEAR THE ECU’S MEMORY. <\/span><\/span><\/strong><\/p>\n

    That’s it!
    \nYour finished OBD2b quick-splice job should look something like this:
    \n    \"OBD2b<\/a><\/span><\/strong><\/p>\n

    Check out Youtuber CtrlAltDefeatTV<\/em> CKF bypass trick video here:<\/h3>\n