ricko Posted August 29, 2011 Share Posted August 29, 2011 I ve fitted a zep racing ecu to my ep91 and on idile its fine but as soon as i drive it the engine management light comes on what have i done wrong?? Is it because i havent fitted my hks accelerator ? is it still ok to drive it ? help please ThanksI think its code 52? Quote Link to post Share on other sites
H_D Posted August 30, 2011 Share Posted August 30, 2011 Did you remove your EFI fuse and disconnect the negative terminal on the battery for at least 20 mins before connecting the ZEP,Once conncted let it idle for 30 mins and then start to drive but take it easy for the first 100-150 miles so the learning parameters start to set properly, Quote Link to post Share on other sites
ricko Posted August 30, 2011 Author Share Posted August 30, 2011 Did you remove your EFI fuse and disconnect the negative terminal on the battery for at least 20 mins before connecting the ZEP,Once conncted let it idle for 30 mins and then start to drive but take it easy for the first 100-150 miles so the learning parameters start to set properly, No i didnt where is the EFi Fuse? i take it i put the fuse back in after i ve fitted the ecu thanks Quote Link to post Share on other sites
micky boy Posted August 30, 2011 Share Posted August 30, 2011 Just disconnect the battery mate dose the same job Quote Link to post Share on other sites
H_D Posted August 30, 2011 Share Posted August 30, 2011 No i didnt where is the EFi Fuse? i take it i put the fuse back in after i ve fitted the ecu thanksIts in the engine bay fusebox, it should be labelled on the actual fuse box cover....this is the proper way to install a self learning plug and play ecu...dont take any silly shortcuts do a proper job and u should get proper results.Hope this helps! Quote Link to post Share on other sites
rorenapier Posted August 30, 2011 Share Posted August 30, 2011 Before removing fuses and doing the wrong thing without checking your code 1st.....Code 52 is relivent to the knock sensor. Either it has been unplugged, or the sensor itself isnt working. Did the EML come on with the std ECU or did it only start happening once you installed the ZEP unit? Quote Link to post Share on other sites
H_D Posted August 30, 2011 Share Posted August 30, 2011 Before removing fuses and doing the wrong thing without checking your code 1st.....Code 52 is relivent to the knock sensor. Either it has been unplugged, or the sensor itself isnt working. Did the EML come on with the std ECU or did it only start happening once you installed the ZEP unit?The thing with the zep is it is more sesitve to picking up fault codes than the standard ecu...i bet if u put the standard ecu in it will not detect a fault code.....trust me mate ive had 2 zep ecus in the past and im running one as we speak,When i had my 1st zep ecu it kept bringing up code 12 which realted to rpm signal so i put the stock ecu in and it was gone, i decided to clean up all the clips an connectors around my distributor as well cheking the connections....1 of the connections did not look so good so i had i soldered and re-installed the zep and the eml light dissapeared but this fault never came up on the stock ecu...hence the zep is more sensetive to picking up fault codes Quote Link to post Share on other sites
H_D Posted August 30, 2011 Share Posted August 30, 2011 Before removing fuses and doing the wrong thing without checking your code 1st.....Code 52 is relivent to the knock sensor. Either it has been unplugged, or the sensor itself isnt working. Did the EML come on with the std ECU or did it only start happening once you installed the ZEP unit?The thing with the zep is it is more sesitve to picking up fault codes than the standard ecu...i bet if u put the standard ecu in it will not detect a fault code.....trust me mate ive had 2 zep ecus in the past and im running one as we speak,When i had my 1st zep ecu it kept bringing up code 12 which realted to rpm signal so i put the stock ecu in and it was gone, i decided to clean up all the clips an connectors around my distributor as well cheking the connections....1 of the connections did not look so good so i had i soldered and re-installed the zep and the eml light dissapeared but this fault never came up on the stock ecu...hence the zep is more sensetive to picking up fault codes,My mate also had code 12 come up and he thinks it went away after changing his dumpvalve but it came on again after a few weeks...again it was a dodgy connection on the dizzy wiring Quote Link to post Share on other sites
rorenapier Posted August 31, 2011 Share Posted August 31, 2011 They are not more sensitive at all. You do know they are standard ECU's with another board built in so they could be mapped?The little jap folk dont touch the parameters of each individual sensor when they wrote these things.As i said above, check the knock sensor, takes 2 mins to get to. Quote Link to post Share on other sites
ricko Posted September 1, 2011 Author Share Posted September 1, 2011 It never happen with the old ecu in . i ve done what you told me to and it keeps flashing on and off ? do i need to get it remaped? Quote Link to post Share on other sites
hough39 Posted September 1, 2011 Share Posted September 1, 2011 my old zep ecu did the same thing, ran it for ages with no problems Quote Link to post Share on other sites
H_D Posted September 2, 2011 Share Posted September 2, 2011 It never happen with the old ecu in . i ve done what you told me to and it keeps flashing on and off ? do i need to get it remaped?check all the connections and the wiring carefully on your knock sensor i can guarantee u there is a faulty connection or a break in one of the wires. Be patient and take your time Quote Link to post Share on other sites
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