Question about 2003 Honda Accord 2.4 LX

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If i swap a engine on a 2003 honda accord, would i have to reprogram the ecm

Do i have to reprogram the ecm after a engine swap

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Hi not on changing the mechanical part the ecm and transponders already match as long as u dont have to change ecm no program is required ex if u have a four cyl and u installed a 6 cyl u need new ecm that wont match including the wiring and ecm that would have to be programed to match bcm body computer module danny

Posted on May 03, 2014

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Techvisitor
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SOURCE: honda accord 2003 v6

If you live near an AutoZone they used to offer free check engine light diagnostics.
See what code they can retreive from the computer with their device and check it against the list of codes. It may not just be a missing Gas cap code. There are hundreds of codes computers can return.

Best Wishes.

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Posted on Nov 19, 2008

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SOURCE: need radio code 2003 honda accord serial no. 12133932

Call your parts department at your local Hoda dealer and give them the serial number. It's usually a four digit number.

Posted on May 11, 2009

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SOURCE: 94 Honda Accord

my d4 is blinking also from time to time what can i do james bklyn

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SOURCE: my 2003 honda accord will not excedd 3000 rpms

1st check air filter and fuel filter for dirty, this cause loose power

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SOURCE: hey i got a 1997 honda accord the motor smoke alot

get the right wireing harness 10x easer

Posted on May 20, 2010

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Whats the name of the wiring harness thats needed in a swap from non vtec to vtec


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Hi, Mike here, I have a 99 Honda Accord that im


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P0700 HONDA Description The Transmission Control Module (TCM) monitors the malfunction of sensors and actuators relating to transmission control. When the TCM detects a malfunction with the control, a signal is send to the Engine Control Module (ECM) to trigger the Engine Light or Service Engine Soon light. The ECM stores the P0700 code and it means the TCM detected a malfunction with the transmission control.

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I have a 1998 toyota corolla with a trouble code p0500- vehicle speed sensor malfunction- I recently replaced my engine with a used engine, that is still under warranty, is this something to do with the...


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In ordinary conditions the engine replacement should not result in VSS error. TI could not find any bulletin about ECM (the car main computer) reprogramming after engine swap but the VSS signal passes through two modules, the ABS and the ECM. If you have replaced the engine you may need to re-flash or re-program the ECM . There are a couple of forums where users complain about the same problem.The job can be done at the dealer place.

Before reprogramming the ECM do the regular troubleshooting for P0500. The problem could have been already there before the engine swap, the VSS or the VSS wiring may also have been damaged in engine replacement operations. Check the VSS mounted on transmission, Ohms are between 500 and 700, check also volt output on bridge. Check VSS wiring to ABS module and ECU and check the two-wire connector to VSS (check volts) . Check ECU connector. Check PNP switch.

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All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
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