91-93 US VR4/91-98GTO/91-95 SL Fed Spec Version 3 Plug and Play Flash Ecu Installation

Thank you for purchasing a Jesters Plug and Play Flash Ecu. This ecu can be utilized for the following  91-93US VR4/91-98GTO/91-95 SL Fed spec depending on internal jumper setup. Please double check you are using the correct instructions for your application.

Package Content:

1x 91-93 US VR4/91-98 GTO/91-95 Fed Spec SL Plug and Play (PNP) Flash Ecu with the latest version of Chrome or ChromeSL preinstalled

1x 91-93 OBD1-OBD2 adapter plug with flash plug for Tactrix 2.0 cable

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1x Gray 12pin connector with yellow and red wires

1x Mitsubishi reflash connector for 95-98 GTO/94-95 SL

5x Extra ecu pins

1x Copy of Chrome – Free download via www.Chromedecu.com

Installation Instructions 91-93 SL/91-93 US VR4/ 91-94 GTO

Jumper setup: The 91-93 US VR4/91-98 GTO/91-95 SL FED Spec PNP ECU jumpers can be seen set up below. If your ecu jumpers do not look like the setup below double check your ecu version. Note 91-93US VR4/91-98 GTO/91-95 SL Fed Spec PNP Ecus can not switch primary O2 sensors on the circuit board by jumpers.

Step 1- With car off, remove stock ecu(See A) from behind center console.

Step 2- Plug the 3 stock plugs and the supplied gray 12 pin plug with yellow and red wire into PNP ecu.

Step 3- Route the yellow & red wires to the stock OBD1 connector (See B) by the fuse box under the driver side dash. (The white 94-95 flash plug with yellow wire will not be used for this installation)

Step 4- Plug the yellow wire into the back of the OBD1 connector, pin 6 (corner location).

Step 5- Plug the red wire in pin 2. For the auto trans SL and some GTOs a stock pin is in this location. Use a small paper clip and remove the stock pin. The pin can be folded back and taped to its wire to keep it out of the ware. Install the new red wire.

Installation Instructions 94-95 SL Fed spec/ 95-98 GTO

Note: For 94-98 GTO/94-95SL Fed Spec installations the white 2G flash plug with yellow wire will be used instead of the obd1-obd2  adapter.

Jumper setup: The 91-93 US VR4 PNP ECU can reverse the primary O2 sensors by changing the jumpers.

Stock setup the jumpers should be horizontal with the plug down. If the jumpers are vertical this switches the O2s.

Step 1- With car off, remove stock ecu(See A) from behind center console.

Step 2- Remove long (3 ft) red and yellow wires from gray connector. Use a small paperclip inserted in front of connector to release pin.

Step 3- Install short (1ft) yellow wire that attaches to reflash connector in pin 51 of gray plug. Ensure pin seats to the front of the plug.

Step 4- Plug the 3 stock plugs and the supplied gray 12 pin plug with yellow wire into PNP ecu.

Step 5- Route the yellow wire and attach white flash plug to small bracket forward of the stock OBD2 plug. See B.

Your car is now converted to a Flash Ecu running Chrome. It is a full OBD2 ecu. You can now use any OBD2 reader or the Tactrix 2.0 cable to reflash or datalog your car(91-93 cars  use the supplied adapter).

Pin Number 91-93 US VR4/91-98GTO/91-95 SL Fed Spec Version 3 Plug and Play Flash Ecu	Pin Number 98-99	98-99 VR4 Function
74	92	Map Sensor 0-5V
51	100	Reflash Connector
52	17	Fan Motor Relay (Hi)
53	18	Fan Motor Relay (Lo)
54	35	EVAP emission vent solenoid
55	93	WBO2 0-5V
56	NA	Obd1 Power 12V
57	97	Future Use
58	96	Future Use
61	73	O2 Sensor Rear Post Cat
62	74	O2 Sensor Front Post Cat
91	67	NLTS
92	49	Sensor Ground

The plug views below is as if you were looking straight at the ecu plug or the back of the vehicle ecu plugs.

Extra pins for the ecu are PN 173716-1 you can buy them from mouser.com.

Note: 1991-1998 GTO JDM will have a catalytic converter light that may come on. Cat temp sensing is not supported on the chrome ecu. You will have to do one of the following to turn off the light. You can pull or cut the wire at pin 6 or you can open the ecu and pull the jumper shown below.

 

Note: There is an error on early revision boards that say “GTO Remove” and points to the FPR solenoid jumper. Leave this jumper. Pull the jumper labled 6 that the tweezers are pointing to in the pic. There is a second close up pic of the jumper.