Community Member Credit: TRoy Otf
If you have a mail-in performance-tuned ECU from Nisformance with advanced map selection features, below are the steps to activate it:
For example, to set map #2 you would hold COAST SET hit the CANCEL button 2 times. The SET indicator will flash two times to let you know you have selected map # 2.
Community Member Credit: Eddy
The Engine Control Unit aka ECM is located in your engine bay right by the battery tray. It makes it easy to swap and replace. Please note that ECM needs to be programmed to your BCM in order for it to work properly.
Community Member Credit: Ben Garner
The ECU monitors the transmission-mounted speed sensor to determine vehicle speed. When the vehicle speed limit is reached, the ECU cuts the fuel flow to the engine to slow the car. Ok, in no way do I condone breaking any laws. I figured out how to get rid of the speed limiter on the 4thgen with automatic transmission. This also works on 5thgen Maxima with automatic transmission.
The signal path for the vehicle speed sensor is as follows:
If the signal is interrupted at the actual connection to the ECU, speedometer, odometer, and cruise control functions are preserved. The ECU does not receive a vehicle speed signal, therefore it will not limit the vehicle speed. This modification is easy. But beware, it does include modification of the factory ECU wiring harness…not for the inexperienced.
Tools and Supplies Needed:
Disconnect the negative battery terminal
Remove ECU cover from passenger side footwell.
Loosen bolt in the center of the main ECU connector using your 12 mm Socket / Socket Wrench and Extension.
Unplug the main ECU connector. Remove snap-on plastic cover from ECU connector.
Locate PINK wire with BLUE stripe. (This wire is located on the right half of the connector when plugged in ECU PIN 29)
Cut PINK/BLUE Wire (It is recommended that you wire this up to a separate switch so you can turn it on/off when needed. Ensure that you do not cut the Fuel Temp Wire as it is also PINK/BLUE)
If you check the codes, you will get P0104 (Vehicle speed sensor fault) and P0504 (A/T control unit fault). To prevent the CEL you can use a switch to switch on/off for the quick burst for going over 120+ MPH. So far there have been no drivability problems associated with this mod.
Reassemble ECU connection and Reconnect negative battery terminal.
Verify the speed limiter/governor is removed by going past your previously limited speed.
Disclaimer: This mod is entirely up to you so do this at your own risk. This modification will cause the “check engine” light to illuminate.
Community Member Credit: CS_AR
Here’s a slide show I pulled together this morning after I removed the ECU from my 99 Maxima. I read some ECU removal instructions and was able to remove the ECU in about 20 minutes or less.
While I purchased a new Offset Ratchet Screwdriver Tool with a #2 Phillips, once I started the job, I quickly realized my existing 8mm Swivel Head Gear Wrench would stay mounted on the ECU bracket bolts and make the removal go faster.
Step 1 – Disconnect Battery
Step 2 – Remove ECU Covers
Step 3 – Remove ECU Wiring Harness
Step 4 – Remove Left Side ECU Mounting Bracket Bolts
Step 5 – Remove Right Side ECU Mounting Bracket Bolts
Step 6 – Lower ECU Away From Mounting Bracket
Step 7 – Remove ECU
UpRev is still working on this ECU. Once it becomes available, the 8thgen 6-Speed Swap will become a reality as the proper tuning will be available (like the 7thgen Nissan Maxima).
Community Member Credit: Jose Gutierrez / Ruben Corga
While this is advertised as Plug-n-Play, it’s really not. You have to run some extra shielded wires for two signals as it does not come with with the crank and cam signal wires. This has happened to about 4 maxima owners who purchased this harness. Overall, the harness does work but it’s not straight plug-n-play and questionable if its worth $500. Car may or may not run without these wires so please keep this in mind.
Order Link: https://turbokits.com/Nissan/Maxima/Engine_Management/
These are harnesses for the use of Haltech’s Elite 2500 units.
