Ground Circuits
WARNING: This page is about a different car, the 1997 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Ground circuits for PCM are located at PCM terminals No. 24, 25, 76, 77 and 103. PCM is located in right rear of engine compartment. To check PCM ground circuits, check for continuity between ground and PCM ground terminals. See TEST EQUIPMENT under PIN VOLTAGE/PID VALUE CHARTS article for equipment to be used. If continuity does not exist, locate and repair open in ground circuit as necessary. See appropriate wiring diagram in WIRING DIAGRAMS article.