ECM question

jdq5947 · March 6th, 2009, 08:30 AM

I have a 1999 GT and I am gonna drop in a 2003 2v and tranny. Am I going to need the ECM for a 2003 or will my 99 work? How about the engine harnass? I am picking up the motor this afternoon and want to make sure I get everything i need. Any help is greatly appreciated.

Trick Tuners · March 6th, 2009, 11:15 AM

I'm not a 100% on these swaps, but i have tuned newer motors with older ecus in the past. I didn't hook up anything so i'm not sure on the pinouts. I would get the ecu pinouts for each year and make sure they are the same. For the swap to technically be smog legal it needs the newer ecu and all the new smog equipment.

jdq5947 · March 6th, 2009, 12:26 PM

I have the pin out for the 99 I am searching for the 03, If I can't find it in the next couple of hours I will just grab the ecm and engine harnass out of the wrecked car. I can always get rid of it later if it is not needed.

Thanks for the info.

Does anyone have the pin out for an 03 ecm?

JasonT1124 · March 6th, 2009, 01:32 PM

You shouldnt need anything from the 2003 except the motor. You need to use all the sensors from the 99 though... but you should be good to go! Im running a 96 block, 01 heads with a 2000 harness and ecm

March 6th, 2009, 08:30 AM	#1
jdq5947 Newbie Join Date: Dec 2007 Posts: 7 iTrader: 0 reviews	ECM question I have a 1999 GT and I am gonna drop in a 2003 2v and tranny. Am I going to need the ECM for a 2003 or will my 99 work? How about the engine harnass? I am picking up the motor this afternoon and want to make sure I get everything i need. Any help is greatly appreciated.

March 6th, 2009, 11:15 AM	#2
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	I'm not a 100% on these swaps, but i have tuned newer motors with older ecus in the past. I didn't hook up anything so i'm not sure on the pinouts. I would get the ecu pinouts for each year and make sure they are the same. For the swap to technically be smog legal it needs the newer ecu and all the new smog equipment. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

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March 6th, 2009, 12:26 PM	#3
jdq5947 Newbie Join Date: Dec 2007 Posts: 7 iTrader: 0 reviews	I have the pin out for the 99 I am searching for the 03, If I can't find it in the next couple of hours I will just grab the ecm and engine harnass out of the wrecked car. I can always get rid of it later if it is not needed. Thanks for the info. Does anyone have the pin out for an 03 ecm?

March 6th, 2009, 01:32 PM	#4
JasonT1124 Regular 2000 Mustang 4.6l Join Date: Feb 2009 Location: Mesa, AZ Posts: 433 iTrader: 2 reviews	You shouldnt need anything from the 2003 except the motor. You need to use all the sensors from the 99 though... but you should be good to go! Im running a 96 block, 01 heads with a 2000 harness and ecm

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