CRX HF CODE 12 EGR HELP??????
Thread Starter
Honda-Tech Member
Joined: Mar 2011
Posts: 56
Likes: 0
From: TX.
CRX HF CODE 12 EGR HELP??????
Ive been having some trouble with my baby for a couple of days now 
Just addded a bigger intake manifold (d15b7) on my HF 1.5 8v. d15b6. My ECU is giving me a code 12 and my car has no EGR Valve (atleaste not anymore lol...) thats no biggie the car works fine when driving but when at a stop this happens... the idle surges up and down i really want to fix this so any suggestions would be very helpfull!
http://www.youtube.com/watch?v=hl5BDIzsc1Y
Just addded a bigger intake manifold (d15b7) on my HF 1.5 8v. d15b6. My ECU is giving me a code 12 and my car has no EGR Valve (atleaste not anymore lol...) thats no biggie the car works fine when driving but when at a stop this happens... the idle surges up and down i really want to fix this so any suggestions would be very helpfull!http://www.youtube.com/watch?v=hl5BDIzsc1Y
Keyboard Humorist
Joined: May 2002
Posts: 9,814
Likes: 11
From: Granada Hills, Ca, USA
Re: CRX HF CODE 12 EGR HELP??????
Got a feeling that the only way to fix that bounce is to put your old intake manifold back on or get a chipped A6 ECU and load HF maps on it.
The EGR has a sensor in it that detects a rod that is mounted in the center of a rubber diaphragm and is lifted up via vacuum. The rod being lifted up opena dn closes the port that introduces exhaust gases into the intake for a second go round in the combustion chamber.
No lift = CEL. Stuck in lifted state = CEL.
EGRs on Preludes can be deleted like this - I believe it should be the same for your HF
You may even be able to measure the resistance across the lift sensor when it is in it's lift state and try different resistors without a relay to simulate this. Problem is if you use the wrong resistance then the CEL will pop on as if the EGR were stuck lifted when it was not supposed to be.
The EGR has a sensor in it that detects a rod that is mounted in the center of a rubber diaphragm and is lifted up via vacuum. The rod being lifted up opena dn closes the port that introduces exhaust gases into the intake for a second go round in the combustion chamber.
No lift = CEL. Stuck in lifted state = CEL.
EGRs on Preludes can be deleted like this - I believe it should be the same for your HF
you need is a relay and a 0-5k ohm rheostat from radio shack. Now on the drivers side tower where the egr solenoid is located, you will see the plug from the ECU that operates the EGR solenoid to allow vacuum to go to the EGR valve. On top of the egr valve is also a plug for the lift sensor.
Wire your relay so that instead of going to the solenoid, it goes to the coil of the relay. Cut the wire going to the ECU for the EGR lift sensor. Then wire the relay so that the wire on the pole goes to the EGR life sensor wire going to the ecu and the normally closed position is wired to the EGR lift sensor wire going to the sensor itself. Then the position that is actuated needs to be tied to the Rheostat set at about 2200 ohms and then after that needs to be spliced into the EGR lift sensor's 5v wire.
There and WALA, no more CEL for a non-working EGR. This is a lot easier to do right at the ECU. If you have a Pin readout of the ecu wires, then do this right there and you won't have to run any wires across the engine bay.
Wire your relay so that instead of going to the solenoid, it goes to the coil of the relay. Cut the wire going to the ECU for the EGR lift sensor. Then wire the relay so that the wire on the pole goes to the EGR life sensor wire going to the ecu and the normally closed position is wired to the EGR lift sensor wire going to the sensor itself. Then the position that is actuated needs to be tied to the Rheostat set at about 2200 ohms and then after that needs to be spliced into the EGR lift sensor's 5v wire.
There and WALA, no more CEL for a non-working EGR. This is a lot easier to do right at the ECU. If you have a Pin readout of the ecu wires, then do this right there and you won't have to run any wires across the engine bay.
Thread Starter
Honda-Tech Member
Joined: Mar 2011
Posts: 56
Likes: 0
From: TX.
Re: CRX HF CODE 12 EGR HELP??????
Thanx for the info man!... but being honest it would be great if you had some pictures to guide me through your information.. that way I can avoid some mistakes! Im really wanna try what your suggesting.. but Im still a rookie at this :/
Honda-Tech Member
Joined: Jun 2003
Posts: 512
Likes: 0
From: Southwest Texas
Re: CRX HF CODE 12 EGR HELP??????
3 year old thread. Original poster probably gave up. He had an obvious vacuum leak with all of those vacuum lines not being connected to the intake manifold. I'm sure the b7 intake manifold he was using didn't do anything for his 8 valve 72 HP HF.
Thread
Thread Starter
Forum
Replies
Last Post
Gumbey75
Honda CRX / EF Civic (1988 - 1991)
6
Jan 17, 2005 10:57 AM
DeDonDeRosa
Honda CRX / EF Civic (1988 - 1991)
3
Jul 1, 2004 01:28 PM
chirp2hrd
Honda CRX / EF Civic (1988 - 1991)
4
Jun 16, 2003 06:47 PM
