stock 97 kouki throwing CEL P0335

[blueballa]

hey i got a 97 240sx. it was a auto so i converted it to 5 speed (using a 5 speed ecu) it has a 91 ka in it but i swapped over all the components from the original motor. the transmission harness is the automatic one and the engine harness is also oem. the car runs fine, starts fine. but i keep getting a cel. when i pull it, its always P0335 which is the crank position sensor circuit malfunction. as soon as i clear it, it comes back. i already replaced the sensor on the transmission bell housing. ( i am using a s13 transmission but ive drilled out the hole and compensated for the rise using a washer). i have a fidnaza flywheel.
the car was slammed so the harness that runs in the driver fender well is a little exposed, nothing completely damaged. the tachometer also does not work. but everything else on the cluster works fine.

[Josh@NSP]

I would have just left it unplugged. On the s14, down below where the ac lines exit the firewall, against the frame there is a plug. That plug is directly run to the crank position sensor via the lower harness. You can usually leave this unplugged without getting a cel, and it doesn't affect engine performance at all. If you still get the cell with it unplugged, it may just be a matter of that sensor not being in a precise enough location. I imagine it would be hard to replicate stock distance using a custom drilled transmission and aftermarket flywheel. Kudos for the effort though!

[blueballa]

I would have just left it unplugged. On the s14, down below where the ac lines exit the firewall, against the frame there is a plug. That plug is directly run to the crank position sensor via the lower harness. You can usually leave this unplugged without getting a cel, and it doesn't affect engine performance at all. If you still get the cell with it unplugged, it may just be a matter of that sensor not being in a precise enough location. I imagine it would be hard to replicate stock distance using a custom drilled transmission and aftermarket flywheel. Kudos for the effort though!

i need to solve whats making the cel go on. leaving it unplugged will not work.

[SoCal-S13]

so you have a 97 S14 with a 91 KA and you are running a 5spd swap on an auto trans harness and auto engine harness and your wondering why you are popping codes.........

[blueballa]

so you have a 97 S14 with a 91 KA and you are running a 5spd swap on an auto trans harness and auto engine harness and your wondering why you are popping codes.........

lol, why would you say something so stupid? do you know anything about s14's? let me bring your smart a** up to date. all dohc are the same........ all you need to do is swap over the intake manifold/sensors for the 97........ the 5 speed swap doesnt matter about the harness, as long as you have the manual ecu........ the engine harness for auto and manuals are the same, hence you dont need to swap over harnesses.......... and im only "popping" one code. if you learn how to read, it clearly says in the title "kouki throwing P0335".

did you learn something? ......................

[solallein]

Just throwing this out there. You didn't crush the crank position sensor when you put the transmission or screw up one of its wires? Was the sensor used and are you saying that you replaced it after you started getting the CEL? You could check resistance on the sensor. Also see if its getting voltage with the ignition switch on.

[blueballa]

Just throwing this out there. You didn't crush the crank position sensor when you put the transmission or screw up one of its wires? Was the sensor used and are you saying that you replaced it after you started getting the CEL? You could check resistance on the sensor. Also see if its getting voltage with the ignition switch on.

no no, the sensor was fine when the was put in, but i bought a new one and installed it, i cleared the cel and it popped right back up. the wires are all fine.

what is the resistance suppose to be? & what reading voltage should i be getting with the ignition switch on?

[fiznowler]

Sounds like you have a bad connection on your lower harness plug. Is your tach doing nothing? or is it reading incorrectly? Did you use an s14 speed sensor? If it is simply not working at all I would start looking for a pinched or broken wire or bad connection somewhere. And I know how much of a b**** it is to hook up that sensor. i ended up using superglue to hold the sensor and bracket inplace to get it on the trans. Your car should run fine without the sensor just the annoying light.

[blueballa]

Sounds like you have a bad connection on your lower harness plug. Is your tach doing nothing? or is it reading incorrectly? Did you use an s14 speed sensor? If it is simply not working at all I would start looking for a pinched or broken wire or bad connection somewhere. And I know how much of a b**** it is to hook up that sensor. i ended up using superglue to hold the sensor and bracket inplace to get it on the trans. Your car should run fine without the sensor just the annoying light.

the tach is dead. no movement what so ever. everything else on the cluster works, fuel, mph, temp, lights, everything but the tach. since the mph gauge is working then that means the vss is working & yes its a s14 m/t sensor.

i have a fidnaza flywheel on it, would that cause the sensor to read incorrectly?
would my tach not working have something to do with the crank position senor?

i need the light to go away for emissions & i want to fix it.

[S14Magician]

i did a 5speed swap on my 95 with a 91 trans and drilled the hole for the ckp. if you go to auto parts store and get the copper washers they use for drain bolts and the like and use one of them its perfect spacing. youll have to sand down the diameter of the sensor a bit to fit the washer on there but you should be fine after that, i am also running a sec flywheel and clutch with no issues with my tach....hope this helps

[blueballa]

i did a 5speed swap on my 95 with a 91 trans and drilled the hole for the ckp. if you go to auto parts store and get the copper washers they use for drain bolts and the like and use one of them its perfect spacing. youll have to sand down the diameter of the sensor a bit to fit the washer on there but you should be fine after that, i am also running a sec flywheel and clutch with no issues with my tach....hope this helps

thanks for the input, i have a spacer on it to compensate for the rise on the s14 transmission. since the cel comes right back on after clearing it, it means its not getting any signal or ground etc. i know the wires on the driver fender wheel are exposed since the car is low and rubbing. im dropping it off since its a electrical problem. ill check back in as soon as i get more info.

[blueballa]

alrighty, i got the car back today, check engine light is gone.. it was a simple stupid fix. the depth of the crank position sensor was too high to read the flywheel teeth and there wasnt a strong magnetic field being created. Once its close enought youll find a sine wave if you measure it with a scope. if you measure resistance on the sensor you should get a reading close to 180, i got 183. as for the tach not working, everything is fine in the circuit, volts behind the cluster reads a square 3.2 volts, which is correct for the tach, it means that i need a new gauge cluster. does anyone know anyone who rebuilds gauge cluster? or tachs? i googled it but no one seems to reply. thanks