OK, i'm been getting this error code on s300 for cylinder sensor. wondering if that's for btc/tdc sensor. where is located on engine?

thanks

 

Code 9 is an error with the cylinder position (CYP) sensor, it is located in the distributor.

 

would an external coil caused this? i have msd ext. coil and 6al box installed.

inside or around the dizzy somewhere for that sensor?

thanks

 

Did this issue start emediately after you added this stuff, or had it run for a while with the MSD ignition? What wiring modifications did you have to make?

If the signal wires are close they could be interfering but that depends on what you have done for wiring. I ran an external Accel coil without any issues, however id didn't add a CDI box.... The Honda ignition is already CDI and it can handle quite a bit of power.

 

it ran fine last year. it started when car was in storage over the winter. once car is started, cel comes on. i usually let it warm up then shut it off. and restart the car n cel goes away.

did more research online, will open dizzy and take a look.

as far as wiring, not special. just take out oem coil...ran 2 wires out of dizzy and connect to cdi box...then 2 wires from box to ext. coil.

 

Today was the first time i have ever used s300 and i got the same code, crazy ha. Hopefully you get it worked out, let us know please.

 

a little update:

open dizzy and checked all wires are good n tight. cap n rotor had some white residue, cleaned it n put back together.

measured resistance on 2 sensor wires(cyp) on dizzy n could not get a reading. not sure if i did wrong or what. tried positive lead on orange wire(****) and neg lead on white wire(****). nothing. tried positive lead on orange wire n neg lead on chassis ground, still nothing.

the resistance supposed to be 350-700 ohms.
i checked the engine hardness side, n got 178 ohms.

ecu is obd1 p28 5spd vtec w/ jumper to stock obd2b hardness

checked b11/b12 on ecu n got nothing. also checked the jumper wires for b11/b12, also nothing. this is how i measured...+ lead to b11 ****/wire...- lead to b12 ****/wire.
wasn't if this is correct or would i need to have + lead to each ****/wire and - lead to a chassis ground.

will try again later when have time. if still the same. i'll get a new dizzy and try that.

here are the two links i used as a reference:

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/code-9-cylinder-position-sensor-2904710/

https://honda-tech.com/forums/honda-prelude-4/cyp-code-coming-my-ecu-969598/

i should also mentioned that the cel only come on sometimes. usually during start up. shut engine off and restart n cel goes away. also car will idle like it's gonna die when the cel is going to come on. if i rev it or drive it immediately then no cel.

 

Check your distributor bolts and wiring harness connectors. Make sure they are good and tight. Also check your timing belt tension. Could be something is moving and causing the engine to be out of timing.

To test the resistance of the CYP it doesn't matter what probe you put on what wire. One goes on each and you should see the resistance. If you are not getting any resistance then there is ether a short in the wires or the VR sensor is toast.

 

when u said vr sensor, is that the cyp sensor?
connectors and dizzy bolts are tight. same as timing belt.
i'll retest the sensor wires again.

it's a possibility that the timing is off. i used a different dizzy for the ext coil n box set up last year. when i took off the dizzy, i marked the top bolt and aligned the new dizzy to it. n of course set engine tdc first.
also the timing is retarted a little bit on the top dizzy bolt. it's half way between middle(0 degree) and full retart...towards the exhaust cam side.
not sure if that makes a difference or not.

 

s300 has nothing to do with the issues you are encountering.
The issue is with either the distributor, wiring or the ecu it's self, not the s300.

Reference the factory honda helms manual and follow the troubleshooting procedures for the code 9.

 

that is correct. like i said, i'll check everything over when i have time.
thanks for the reply.

 

Yes I meant the CYP sensor. VR or variable reluctance is the type of sensor that it is.

 

re-checked the two sensor wires for resistance and still no reading. i took an old dizzy and measured it and it reads 355 ohms.
i'm guessing it's either the sensor is bad or short in the wires.

i'll switch everything over to the old dizzy and see if that solved the problem.

 

another update:

was gonna switch to another dizzy with good cyp sensor resistance but found out that the dizzy in car had a bad cyp sensor pin on dizzy plug. only found out because i cut the 2 cyp wires and when mearsured it had good resistance.

re-wired the cyp sensor wires and start car...no cel. problem free for 3-4 days then cel popped back on. this time it remains on even if i shut car off and restarted. remeasured sensor wires, still get good resistance(356 ohms). could the sensor be bad even though the resistance is within range? stock wire hardness and jumper hardness both had good numbers when measured(455 ohms).

took ecu cover off and measured the two sensor pins that leads to circuit board and got 9 ohms. should the ecu still be around the 350-700 ohms range? not sure if 9 ohms is within range or if ecu is bad.

what do u guys think? should i get a new dizzy/ecu?

 

Try the ecu in another vehicle that is throwing no codes.
If the code 9 appears, the issue is the ecu.

You can also try another ecu in the vehicle and see if it throws a code 9 etc.

 

update three: i read online that you could replaced the sensors in the dizzy. just have to find a good dizzy housing. only thing is you have to cut the wires. replaced the cyp from an old dizzy.
it's been over two weeks now and no cyp cel. hopefully that solved the problem.