C_Rock77

I've got a bone stock automatic 2000 Civic DX that is my daily driver. I've been having issues with a P1381 and P0304 trouble codes.

The P1381 is the code for the CYP sensor in the Distributor. The first thing I did was replace the distributor with another. Code persisted.

I read that there is some issue with bad diodes in the alternator causing this issue. Had the alternator checked, and diode ripple came back within normal limits.

This is driving me crazy. Can anyone let me know what I need to try to fix this issue?

Hondatherdm

Unplug the dist. connector and measure resistance, if its not between 350-700ohms replace dizzy

C_Rock77

Resistance across what?

And not to sound ungrateful about you replying.....but did you even read the whole post?

Hondatherdm

dist. side of the connector.(male) Also your prob seems intermitent, usually caused by bad/loose pin connectors. Also check for continuity between ground and the 2 pins that shown in pic above

C_Rock77

TWO PINS? Like i asked before, WHICH 2 PINS? The plug has 8 pins!

I highly doubt the issue is in the distributor, considering the problem persists on 2 different ones.

Hondatherdm

k, unplug connector "c" from pcm its 32 pin connector and measure resistance on pins 29(yel) and 30(blk) resistance should be between 350-700 ohms. Also check for continuity by sticking one meter probe on ground and one in pin 8, 20 and 29 if you get some resistance that means they shorted, also when you doing this tests by tapping the wires slightly and watch your meter numbers if the change all of a sudden

C_Rock77

Checked continuity between the connections, and it seemed ok.

Finally broke down and took it to a shop. They said I needed a new distributor. Ordered one from Distributor King. It seemed to HELP the problem, but the car STILL has a CEL (Including a misfire).

The shop gave me a printout that showed the troubleshooting process. It said said that if the problem persists, replace the ECU. Well, I replaced the ECU, and the problem STILL persists.

This is driving me CRAZY!!!!

Hondatherdm

could be 2 different problems. Misfire what are you missing fuel, compression or spark?

C_Rock77

At wits end on this sh*t. Doesn't FEEL or sound like a misfire, yet the CEL flashes when the car is driven.

CEL with a code for CYP sensor persists, even with a distributor from Distributor King.

Ok....Problem started. I actually take a distributor I had and put it on the car. Didn't change anything. B/c it was so old, I say to myself that it COULD still be the dizzy. I order one from a recycler, and that doesn't fix the problem. Take it to shop. Shop said that a NEW dizzy from a parts house fixed the starting & misfire problems (it made it easier to start, but didn't completely make the problem go away). They tell me the price for the dizzy, and I refuse to buy it, and order from Dist. King. I go to pick up the car, and the misfire code continued. Then, I take it to the local Honda dealer.

They called me and said that the harness wiring checked out and they tried BOTH the ECUs I had, and the problem persisted. Technician said that everything was pointing to starting with a NEW HONDA distributor.

I just don't see it as a possibility. Pretty much thinking "There's no f*cking way it's the distributor."

All these "technicians" are telling me the same thing. I mean, isn't trying one thing over and over and expecting different results one definition for insanity?!

ANYONE ever heard of anything like this?!

Former User

Do P1381 and random misfire codes continue to be thrown?

C_Rock77

Yes. Those codes continue to be thrown

Former User

Have you tested both CYP sensor wires that run between the ECU and distributor connector for a short (=continuity to body ground)?

Former User

Here's the service manual procedure to troubleshoot P1381 for an 00 D16Y7:

C_Rock77

Took it to the Honda Dealership b/c noone I know of can figure this out. They claimed to have checked the wiring, etc. Drives me crazy b/c you don't talk to the technician, but to some "Service Advisor".

The only thing they keep saying is that they need to start with a HONDA distributor....

This thing has had 4 distributors on it. Granted, none were NEW OEM Honda. But chances of this problem originating in the distributor seem like are slim to none!

Former User

Buy a low impedance digital multimeter ($10-$25) and test the wires yourself.

C_Rock77

Ron, I took it to the local Honda dealership. They had it for almost a week & the techs kept saying to put a Honda Dizzy on it. The Svc Adviser guy was emphatic that he didn't believe the problem was the dizzy (due to the fact that this was the 4th one I'd tried). They went through tech bulletin after bulletin. STILL could not find the issue.

They waved the white flag and told me to come pick up the car.

Evidently, some "Honda Specialist Technicians" are coming in in a month or so. He assured me that the car was fine and was not misfiring, it's just some phantom code.

Former User

If no electrical problems are found when following the troubleshooting tree, the next step is to swap in a known good ECU. It wouldn't surprise me if the techs did not complete the recommended troubleshooting and just gave up. Learning to do this type of basic electrical work yourself is both gratifying and money saving. Don't fear the multimeter. Most tests are straightforward and not difficult to learn. Many on the forum could teach you.

C_Rock77

Yeah. We went that step, also. I replaced it with another ECU.

Colin

iTrader: (1)

Sorry to bump an old thread, but did this ever get resolved? My friend is having the same issue w/ his CRV. He's replaced the distributor and the ECU with no change in the CEL. He said he checked the continuity and resistances per the Helms and it was all as it should be. Any input?

skinney6

do you have this for a 98 civic gx auto tran?
thx