1514 code and "reduced engine power" = won't start
Thread Starter
Racer
Joined: Feb 2008
Posts: 410
Likes: 0
From: Topeka KS
1514 code and "reduced engine power" = won't start
So I just installed some AFR 205's and a custom cam and I'm using the LS6 intake and ported my stock TB. Anyways, I was having a local guy tune the car for the new setup with my 42# injectors and we were almost done when the car suddenly shut off in his driveway. Oil temp was about 205 deg F and coolant was about the same plus the A/C was on as we were tuning it for conditions w/ the AC on and it read "reduced engine power". 2 strange codes showed up and one of them was PO1514 - something about the MAP to throttle position mismatch, can't remember the other code. After that the car would not start. It would crank but acted like it was not getting any spark. He cleared the two codes and it started without any problems. Is there a table that needs adjusting for having an electronic TB? This is the first electronic TB LSx car that my tuner has done but he has tuned a LOT of LSx F-bodies. Also he tuned it in open loop so no MAF or O2 inputs.
Last edited by civlant; Jul 5, 2009 at 11:29 PM.
Former Vendor
Joined: Feb 2007
Posts: 2,572
Likes: 1
From: Austin Texas
You can raise the P1514 Table and a custom histogram can be created to monitor the actual airflow vs. TPS. I would double the table for now so the car doesn't go into Reduced Power Mode while tuning.
Pro
Joined: Jul 2005
Posts: 632
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From: Lynchburg VA
I turned the P1514 DTC off and it still throws the code, how is that possible?
Last edited by ZO6-Driver; Jul 15, 2012 at 06:21 PM.
Platinum Supporting Vendor
Joined: Sep 2001
Posts: 3,665
Likes: 341
Well you don't want to turn it off for starters. If you actually have a case of a something getting caught in the TB, this is what would cut your car off, if it is disables you will just accelerate away.
The calculated airflow table for the TPS is wrong, like was said above you can double it for the tuning process but you need to go back and see what the actual airflow is, I add 10-15% over that and enter it. This way everything is working as it should. Your tuner should already know about this table.
The calculated airflow table for the TPS is wrong, like was said above you can double it for the tuning process but you need to go back and see what the actual airflow is, I add 10-15% over that and enter it. This way everything is working as it should. Your tuner should already know about this table.
Pro
Joined: Jul 2005
Posts: 632
Likes: 0
From: Lynchburg VA
Well you don't want to turn it off for starters. If you actually have a case of a something getting caught in the TB, this is what would cut your car off, if it is disables you will just accelerate away.
The calculated airflow table for the TPS is wrong, like was said above you can double it for the tuning process but you need to go back and see what the actual airflow is, I add 10-15% over that and enter it. This way everything is working as it should. Your tuner should already know about this table.
The calculated airflow table for the TPS is wrong, like was said above you can double it for the tuning process but you need to go back and see what the actual airflow is, I add 10-15% over that and enter it. This way everything is working as it should. Your tuner should already know about this table.
So I should copy and paste a stock table in and add 15% to all cells? If I need to create a custom histogram and monitor airflow compaired to TPS wont it just throw the code before I can get the cells to poulate?
Thanks for your time
Chris
Platinum Supporting Vendor
Joined: Sep 2001
Posts: 3,665
Likes: 341
The cable car should not have that code enabled since it is a drive by wire safety, I think but not 100%. You are hoping that 15% will be enough until you get the correct numbers. Try 20%, there is not set rule, just don't max them out incase you get into a issue.
Pro
Joined: Jul 2005
Posts: 632
Likes: 0
From: Lynchburg VA
When I come to visit my buddies Chris and Terry in Richmond I'll give you a buzz and maybe stop by and check out your shop. I think Chris Bishop had talked with you about his Dress Up Bolts business before.
Thanks
Chris
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From: Lynchburg VA
