Hey guys, I just picked up my car and it has a JDM dohc zc engine. The only code the car is throwing is a # 8 TDC - top dead centre sensor.
The engine seems to run fine but Id assume this may be affecting performance. Can anyone help me with what I should check first?? I have a spare D16a6 thats pretty complete if I can simply try some part swapping.
Any help diagnosing this would be appreciated!! I searched but couldnt even locate the sensor on the engine etc
Sounds like I need to learn wiring diagnostics and ecu pinouts!!
I just bought the car and the engine is a disgusting mess, it had a valve cover leak seemingly its entire life and is literally caked 1/2" thick on some spots, Ive given it 3-4 passes with engine cleaner and its almost presentable so I can possibly determine wire colours hah
So you think it may be a wire problem? As far as I know the car is bone stock, but will the harness connection for the TDC sensor be outside of the distributor?
Im a little new at wiring diagnostics etc, but Im eager to learn and appreciate the info so far 4drEF thank you
I searched but couldnt even locate the sensor on the engine
TDC sensor that gives code 8 is inside the distributor - as 4drEF said, first check the orange/blue and white/blue wires at the distributor connector to make sure you have continuity to the ECU - could also be a bad distributor
the distributor has 2 connectors - one is round and has 2 wires - unless someone has switched connectors, the other one should be rectangular with 5 wires in a 6 pin connector (one pin is empty) - it appears from your picture that your distributor is aftermarket and may not have the same wire colors coming out of the distributor to the connector as the factory colors - some aftermarket distributors also do not have the wires in the correct locations at the connector to match the engine harness, which may be part of your problem - look at the connector on the engine harness where the distributor plugs in - you should see the white with blue stripe and orange with blue stripe wires at these pin locations:
Ok I dont really know how to show/explain this, but its definetely an aftermarket dist as none of the colors are the same. And some were so gosh darn similar I just took some pictures, and labelled them like a 5 year old lol
I hope those help
Im pretty sure I need to check continuity to help myself/you help me out anyfarther but Ive never pulled the ecu in this car and my brother borrowed my multimeter so I can do that tonight after work for sure.
Do I simply disconnect the ecu and find these wires on the harness and probe there pins and the pins at the distributor ?? Or is there more to it
I had this problem with my EF, granted it was not that motor. There was great debate on if that sensor was located in the distributor or somewhere else, i dont remember where exactly. I just replaced the dizzy and it went away.
You can switch them at the dizzy or at the ecu, the end result should be the same. And de-pinning is easy as hell, just unplug the connector, get a very small blade screwdriver or a dental pick type thing and depress the little plastic spring on the front of the connector, (in the hole where the pin is) then pull the wire out the back. Swap them around and slide them back in and they sort of *click* in once you get them far enough in.
It should take you like 2 minutes, its super easy.
So if everything checks out and u have a known good ecu can the sensor still be bad if it ohms in the range? I got a similar code. Code 4. Had a code 8 before replaced the dizzy with a oem one from a biddya week later get code 4.
90 crx si.. b18c swap 13.98@ 99.98mph with 2.0 60ft. 198whp and 137wtq. Spray or pray!
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