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Power Transistor: 300ZX

  1. Turn engine off. Check harness continuity between power transistor and ECU. If okay, proceed to next step.
  2. To check power transistor, disconnect harness connector to power transistor. See Fig 1. On power transistor side of connector, connect ohmmeter positive probe to terminal No. 1 and negative probe to terminal No. 3. No continuity should exist.
  3. Connect ohmmeter negative probe to terminal No. 1 and positive probe to terminal No. 3. Continuity should exist.
  4. Connect ohmmeter positive probe to terminal No. 1 and negative probe to terminal No. 2. No continuity should exist.
  5. Connect ohmmeter negative probe to terminal No. 1 and positive probe to terminal No. 2. Continuity should exist.
  6. If readings are not as specified, replace power transistor.
Fig 1: Power Transistor Check Points
G62517
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