Disconnect power transistor connector. Connect ohmmeter positive lead to terminal "g" and negative lead to terminals "a", "b", "c", "d", "e" and "f" of power transistor connector. See Fig 1 -Fig 3 . If there is continuity, replace power transistor.
If there is no continuity, reverse ohmmeter test lead polarity and check continuity between terminals listed in previous step. If there is no continuity, replace power transistor. If there is continuity, check continuity between terminal "g" and terminals No. 1, 2, 3, 4, 5 and 6 (check with polarity in one direction, and then with polarity in opposite direction).
There should be continuity regardless of ohmmeter test lead polarity. If there is no continuity, replace power transistor. If there is continuity, check continuity between the following terminals, noting ohmmeter test lead polarity:
- "a" (+) and No. 1 (-).
- "b" (+) and No. 2 (-).
- "c" (+) and No. 3 (-).
- "d" (+) and No. 4 (-).
- "e" (+) and No. 5 (-).
- "f" (+) and No. 6 (-).
If there is no continuity, replace power transistor. If there is continuity, reverse ohmmeter test lead polarity and check continuity between terminals listed in previous step. If there is continuity, replace power transistor. If there is no continuity, power transistor is okay.

Fig 1: Power Transistor Connector Terminal ID (Maxima VE30DE)

Courtesy of NISSAN MOTOR CO., U.S.A.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Power Transistor: 300ZX