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NIStune Type 1 Hardware Installation Page 12 of 12
B. 1986 Single Board - Dual ROM ECUs
Vehicles: Z31 300ZX VG30 1986-1987, CR31 / VL / VLT RB30
Some 1986 era ECU have both a 28 pin ROM and 24 pin ROM chip. These are located next to each other.
Not to be confused with the 24 pin RAM chip that is located next to the HD6802 processor.
1. Remove both of these ROM chips as seen below. The second smaller ROM actually overshadows the
maps on the first ROM for ECUs so is not needed for normal ECU operation.