Free PDF Downloads

Toyota Supra MK4 (JZA80) Wiring Diagrams

Factory OEM electrical wiring diagrams for the 1993–1998 Toyota Supra JZA80. Covers all domestic and J-spec variants — essential for 2JZ-GTE, 2JZ-GE, and 1JZ engine swaps.

The Toyota Supra JZA80 (MK4) was produced from 1993 to 2002, with US-spec models running 1993–1998. Whether you're building a standalone 2JZ-GTE harness, doing a 1JZ or 1UZ swap, or simply tracing a fault, these factory EWDs cover every circuit in the car — engine, chassis, body, and A/C. The J-spec workshop manual is particularly thorough and includes pinouts, relay diagrams, and connector locations not found in the USDM EWD.

Need a custom standalone wiring harness for your MK4 Supra? SVK Works builds plug-and-play harnesses for Haltech, Link, MaxxECU, EMU Black, and more. View MK4 Supra harnesses →

MK4 Supra
1995 Toyota Supra EWD
Complete factory electrical wiring diagram for the 1995 Toyota Supra JZA80 (2JZ-GE / 2JZ-GTE). Covers all chassis circuits.
PDF • 5.3 MB View PDF
MK4 Supra
1997–1998 Toyota Supra EWD
Factory electrical wiring diagram for the 1997 and 1998 model year Toyota Supra (JZA80). USDM spec.
PDF • 4.7 MB View PDF
MK4 Supra
JZA80 Supra J-Spec Workshop Manual
Complete Japanese specification workshop manual. Comprehensive wiring reference including pinouts, relay diagrams, and connector locations.
PDF • 21.1 MB View PDF
MK4 Supra
98+ JZA80 J-Spec EWD
Japanese specification electrical wiring diagrams for 1998 and later MK4 Supra variants. Compact reference.
PDF • 0.6 MB View PDF
MK4 Supra
JZA80 Model Differences Chart
Year-by-year specification and wiring differences across all MK4 Supra model variants — essential when sourcing parts for a non-matching year.
PDF • 0.1 MB View PDF
← All Wiring Diagrams MK4 Supra Harnesses