Throwing OBD1 code 12
Thread Starter
Honda-Tech Member
Joined: Jan 2008
Posts: 29
Likes: 0
From: Raleigh, NC, USA
Throwing OBD1 code 12
Hey guys, this is a wierd one.
Most times when I fire up my 95 prelude and take off, within 1min I usually have the heck engine light come. When I check the code, it's 12 for EGR.
The wierd part comes in that if I simply stop the car then restart, I good until the next time. So it appears to throw the code only when the car is cold and starting to warm up.
The details of the car is that I swapped the H23 for an F22B (I know I know, why but it's because of $$) and the ECU as well.
The car starts and runs great, well maybe less than idle gas mileage as I'm only getting ~20-22 mpg mostly highway driving.
I have gone through the diag chart provided in the Honda SM, but came up empty handed in that everything worked and puttin gin a different ECU didn't solve the problem. As I got the car from a dealer, I can;t ask the old own, but there was blank tape which I didn't see until much later, over the check engine light. I can only gather that this has been a persistent problem and NOT related to the motor itself.
I even soldered wire onto the EGR lift sensor and hooked up a volt meter to check the feedback vaoltage was ~4VDC. When the code comes on, I check right away and see that it is indeed ~4VDC.
What I don't understand is what causes the EGR code. It must be more than the feed back voltage from the EGR lift sensor.
Any ideas?
Most times when I fire up my 95 prelude and take off, within 1min I usually have the heck engine light come. When I check the code, it's 12 for EGR.
The wierd part comes in that if I simply stop the car then restart, I good until the next time. So it appears to throw the code only when the car is cold and starting to warm up.
The details of the car is that I swapped the H23 for an F22B (I know I know, why but it's because of $$) and the ECU as well.
The car starts and runs great, well maybe less than idle gas mileage as I'm only getting ~20-22 mpg mostly highway driving.
I have gone through the diag chart provided in the Honda SM, but came up empty handed in that everything worked and puttin gin a different ECU didn't solve the problem. As I got the car from a dealer, I can;t ask the old own, but there was blank tape which I didn't see until much later, over the check engine light. I can only gather that this has been a persistent problem and NOT related to the motor itself.
I even soldered wire onto the EGR lift sensor and hooked up a volt meter to check the feedback vaoltage was ~4VDC. When the code comes on, I check right away and see that it is indeed ~4VDC.
What I don't understand is what causes the EGR code. It must be more than the feed back voltage from the EGR lift sensor.
Any ideas?
Thread
Thread Starter
Forum
Replies
Last Post
1998_4dr_gsr
Acura Integra
4
Oct 27, 2006 03:21 PM
