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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:
- Sensor to Speedometer
- Speedometer to ECU & Cruise Control
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:
- Socket Wrench
- Socket Wrench Extension
- 12mm Socket
- Crimp Tool
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.