Toyota Supra 2JZ-GTE | Toyota Aristo 2JZ-GTE 1991-1998 Haltech Nexus Wiring Harness - A341E Automatic (BF29188)

The Boomslang plug-and-play wiring harness BF29188 connects a Haltech Nexus R3, R5 or S3 to the factory engine harness on the 1993-1998 Toyota Supra 2JZ-GTE and 1991-1997 Toyota Aristo 2JZ-GTE (2JZ-GTE engine, A341E automatic) with an automatic transmission. It plugs in where the factory ECU connects, so there is no cutting, splicing or repinning, and the vehicle can be returned to stock at any time.

Vehicle Fitment

• 1993-1998 Toyota Supra 2JZ-GTE (automatic transmission)
• 1991-1997 Toyota Aristo 2JZ-GTE (automatic transmission)

Boomslang part number: BF29188. Confirm your model year, engine and transmission before ordering. Similar-looking vehicles often use a different factory ECU connector or pinout and need a different harness.

Compatible Haltech ECUs

Choose the version that matches your ECU. Each version is built for that unit's connectors:

• Haltech Nexus R3 VCU
• Haltech Nexus R5 VCU
• Haltech Nexus S3 ECU

Features

• Vehicle-specific plug-and-play fitment for the 1993-1998 Toyota Supra 2JZ-GTE and 1991-1997 Toyota Aristo 2JZ-GTE
• Plugs into the factory engine harness with no cutting, splicing or repinning
• Factory harness is left untouched, so the install is fully reversible
• OEM-style connectors and correct wire gauge throughout
• Built in the USA by Boomslang

What's Included

• 1x Boomslang plug-and-play wiring harness (BF29188) for the 1993-1998 Toyota Supra 2JZ-GTE and 1991-1997 Toyota Aristo 2JZ-GTE
• Haltech ECU sold separately

Transmission

The 2JZ-GTE cars did not get the standard A340E. Toyota fitted the A341E, the heavy-duty member of the same A340 family, with a longer input shaft and a larger pump and converter to survive the turbo motor's torque. The automatic chassis uses a different engine-bay connector layout than the manual, which is why this harness carries its own part number. Check the code stamped on the transmission ID plate before ordering — if the car is a manual, you want the manual-transmission harness instead.

Frequently Asked Questions

Does BF29188 require cutting the factory wiring?

No. The Boomslang harness plugs into the factory engine harness connectors, so the stock wiring stays intact and the vehicle can be returned to stock.

Which Haltech ECUs work with BF29188?

Haltech Nexus R3 VCU, Haltech Nexus R5 VCU, Haltech Nexus S3 ECU. Select the matching version when you order.

Does it need a tune after installation?

Yes. A Haltech standalone ECU must be calibrated for your engine and modifications before the vehicle is driven. Tuned By Shawn offers remote and in-person Haltech tuning. Email service@tunedbyshawn.com with any fitment questions before you order.

For off-road and competition use only. Not legal for use on pollution-controlled motor vehicles.