Test O: Unable To Enter Self-Test
WARNING: This page is about a different car, the 2000 Mazda B4000, 2000 Mazda B3000, and 2000 Mazda B2500. However, it is still accessible from the selected car via links, so may be relevant.
Check communication between GEM/CTM and NGS Tester. If NGS Tester communicates with GEM/CTM replace GEM/CTM, clear DTC's and perform self-test diagnostics. See SELF-DIAGNOSTIC TEST . If NGS Tester does not communicate with GEM/CTM. See TEST M: NO COMMUNICATION WITH GEM .