Power Circuits
WARNING: This page is about a different car, the 2002 Mazda Tribute, 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch off. Disconnect PCM harness connector and connect 104-Pin Breakout Box (49-UN01-130). See Fig 1 . Using a DVOM, check for battery voltage between ground and PCM terminal No. 55 (KAPWR). Turn ignition switch to START or RUN position. Check for battery voltage between ground and PCM connector terminal No. 71 (VPWR). See Fig 2 -Fig 6 . If battery voltage is not present, power is not being supplied from PCM power relay. See WIRING DIAGRAMS article.