error code 22 knock sensor
#1
error code 22 knock sensor
right well the C/E light has been coming on and of randomly.. occasionally staying on and sometimes going off with a rev of the engine.., done a code check and its come up with 22 knock sensor, the car never feels any different if light is on or off
tried to reset the ecu but i think i have a missing wire on 1 of the green connectors...1 has only 1 wire coming out, so no joy when i tried.
is there an alternative way to reset the ecu?
car is an impreza 555 GT (n plate). mods (if it matters) are stainless to the turbo stainless mani, headers, and a chip, also just had a stage 2 carbon kevlar clutch (sure ive heard something about racing clutches occasionally throwing the knock sensor on... may be a load of poop tho....
anyway any input wud be great folks
tried to reset the ecu but i think i have a missing wire on 1 of the green connectors...1 has only 1 wire coming out, so no joy when i tried.
is there an alternative way to reset the ecu?
car is an impreza 555 GT (n plate). mods (if it matters) are stainless to the turbo stainless mani, headers, and a chip, also just had a stage 2 carbon kevlar clutch (sure ive heard something about racing clutches occasionally throwing the knock sensor on... may be a load of poop tho....
anyway any input wud be great folks
Last edited by l555dvy; 22 February 2011 at 04:47 PM.
#5
BUT... what if the K/S is correct... how would i know?, in all honesty theres about 20-30 secs of piston slap first thing in the mornin, goes away after that... related?, or wud i know all about it if there was knock as such
#6
with ignition off disconnect plug from knock sensor with a multimeter measure the resistance between cars body (as earth) and knock sensor terminal pin 1 i think, should be about 560 ohms..:-)
#7
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#9
The knock sensor is there to detect pre-ignition of the fuel/air mix ('det') and when it is working correctly and detects 'det' it will retard the timing which you may feel as the car holding back slightly under acceleration. This will only happen when you are giving it some stick (certainly not when you say there is a bit of piston slap on startup) and a CEL won't be generated.
Chances are the sensor is faulty or the earth for it to the block is bad, so safe bet is to fit a new one ( intercooler off, fiddly job anyway, and make sure the aluminium on the block where it contacts is clean).
Kevin
Chances are the sensor is faulty or the earth for it to the block is bad, so safe bet is to fit a new one ( intercooler off, fiddly job anyway, and make sure the aluminium on the block where it contacts is clean).
Kevin
#10
excellent cheers dudes, ill pick 1 up asap, really paranoid about this impreza.. had a few , some good but the last 2 not so good and vowed them to be my last, but couldent stay away and this 1 is a minter from belgium, but now rhd... just hope this is nothing serious
#11
The knock sensor on my old car packed up at 80k miles and 7 years with the same symptoms you have. There was some minor oxidation on the block and some rust on the sensor surface, car ran fine. New sensor, no more errors.
#15
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ive had exactly the same problem but the CEL dose illuminate whilst the engine feels 'held back'. would using octane booster to illiminate the engine from knocking confirm that its the sensor at fault?
#17
that'll do for me, ive just reset the ecu and will take it a little run later... if its an old code and now off then happy days, if not knock sensor. cheers for all the info dudes
#19
cheers mate, ill have that if the light is not cleared
ps cheers for the link to the service manual, very handy
ps cheers for the link to the service manual, very handy
Last edited by l555dvy; 22 February 2011 at 06:11 PM.
#20
It wouldn't surprise me if the ecu acted on a faulty sensor signal to protect the engine though.
You haven't said if your error is code 22 however.
#22
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i pluged it in to a snap on EOBD scanner we have in work but it wouldnt communicate. took it to the auto electrition we use and plugged it into his bosh scanner, it did flag up a past code relating to the knock sensor but no present codes.
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its year 2000 on a Y reg sport (non turbo unfortunatly) dont think its the flasher type, just my luck to pursuade my boss to invest in a decent scanner and it wont communicate with myne
#26
right.... disconnected the battery for about 30 mins, code was on still... stayed on for 15 mins of driving then went off and stayed off for about 15 mins... parked up and left it, light didnt come back on... what you think?
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