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Toyota Supra MK3 (MA70 / JZA70) Wiring Diagrams
Factory OEM electrical wiring diagrams for the Toyota Supra MK3. Covers 1987 and 1990 model years — essential for 7M-GTE diagnosis, 2JZ/1JZ swap wiring, and standalone ECU builds.
The Toyota Supra MK3 (MA70 / JZA70) was produced from 1986 to 1992. The 7M-GTE was the factory turbocharged engine in early cars, while later Japanese models used the 1JZ-GTE. A very popular swap is the 2JZ engine into the MK3 chassis — these factory EWDs are the starting point for any serious standalone harness build or chassis wiring repair.
Building a standalone harness for your MK3 Supra? SVK Works offers custom harness solutions for 2JZ and 1JZ swaps. View MK3 Supra harnesses →
MK3 Supra
1987 Toyota Supra MK3 EWD
Complete factory electrical wiring diagram for the 1987 Toyota Supra MA70 / JZA70. Covers 7M-GE, 7M-GTE engine and full chassis circuits.
MK3 Supra
1990 Toyota Supra MK3 EWD
Factory electrical wiring diagram for the 1990 Toyota Supra MA70 / JZA70. Updated circuits for the 1990 model year.