OBD2b No Tach
10-24-2015, 10:34 AM
#1
Honda-Tech Member
Thread Starter
OBD2b No Tach
Hi guys and girls I did a manual swap on my 2000 civic ex 2dr I got a p28 ecu and a obd2b jump harness my problem is that my rpm don't work but when I plug the automatic ecu back rpm work fine I try the p28 with the jump harness on others that are manual from factory and it work fine I can't find nothing on the search engine I need help oh and when I start the car the rpm jump and stay down
Last edited by Vi_Nation; 10-25-2015 at 12:32 PM.
10-26-2015, 10:58 AM
#2
Honda-Tech Member
iTrader: (1)
Re: Ecu
Tach signal comes from the ecu on obd2 but from the distributor on everything earlier. If it's not built into your harness adapter, you'll need to figure out a way to get tacho pulse to A19 on the obd2 side.
10-26-2015, 04:59 PM
#3
Honda-Tech Member
Thread Starter
Re: Ecu
spAdam that means that the jump harness somewhere from the engine harness to the p28 ecu is not connected right where it belongs right
10-27-2015, 06:33 AM
#4
Honda-Tech Member
iTrader: (1)
Re: Ecu
Honestly I don't remember 100%, it's been about four years since I did mine. Search around. You're far from being the first person to have this issue, but I'm confident that's the problem.
10-28-2015, 04:52 AM
#5
DO IT ON ALL FOURS
10-28-2015, 12:25 PM
#6
Honda-Tech Member
Thread Starter
Re: Ecu
@ OneBadTurboCRV the wire is jump but it still don't work but when i turn the key an start the car the rpm jump and stay down it's driving me crazy
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11-15-2015, 02:26 PM
#9
Honda-Tech Member
Thread Starter
Re: OBD2b No Tach
So far all most everything the only thing i have not done is cutting my harness to run the wire to the tach meter which im not going to do
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