Power Transistor
WARNING: This page is about a different car, the 1995 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.
For power transistor system testing, see DTC 21 - IGNITION SIGNAL in the TESTS W/CODES - 1.6L article. For power transistor component testing, see IGNITION SYSTEMS in the SYSTEM/COMPONENT TESTS - 1.6L article.