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How to install an OBD 2 EPROM emulator(code name:T-Rex) Chip on 96-up OBD-II Honda ECU (or VTEC)

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Here is a step by step guide toward installing an OBD2 EPROM Emulator(code name:T-Rex) on 1996 to 1999 Honda OBD-II ECUs . First, open up your ECU top cover.

Figure 1
Engine Computer

Figure 2
Remove Top Cover

Open the top panel of the ECU. Figure 2 is a view of the ECU Components side. Look for the Stock MCU a 84 pins PLCC square chip with the marking Oki 66507. It is at the lower left corner away from the ECU Plug (top view). Quite easy to spot as the biggest chip in the ECU.

Get the Blank T-Rex Emulator Figure 3,4 look like a programming adapter. Remember no soldering needed.

Figure 3
Blank OBD2 T-Rex Emulator

Figure 4
Back of OBD2 T-Rex Emulator

Plug the Superfast EPROM on top of the T-Rex Emulator. Figure 5 install a ready burned super fast EPROM 27C512 or 27C256 on top of the 28 pin IC socket. Make sure the pin goes in the right location. Figure 6 show just plug the whole Emulator on top of the stock 84 pin MCU. Make sure to bend the crystal outward first.

Figure 5
Plug the EPROM on top of the T-Rex Emulator

Figure 6
Plug to whole Emulator on top of the Stock MCU

You are all set to test the new chip!! Figure 7 shows the complete OBD2 T-Rex Emulator installation

Figure 7
Newly reprogrammed ECU ready to be installed

Put back the top ECU cover and ready to test. Remember the new T-Rex 'Plug-N-Play' technology requires NO SOLDERING and you can replace EPROM anytime. Just remove the whole T-Rex emulator should you decide to go back to stock.

Plug the ECU back on your Honda, reconnect back the battery positive terminal and start the car to check whether the car is runing fine. If you don't have any check lights and able to rev pass 4000rpm, you have just successfully chip your own Honda ECU.