1992 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Power Transistor Circuits

  1. Disconnect 7-pin connector from power transistor unit. Disconnect 3-wire ignition coil connector.
  2. Check continuity of each circuit between ignition coil connector terminal "C" and corresponding wire terminal of power transistor unit 7-pin connector. See Figure. For wire colors and related ECU connector terminals, see L - WIRING DIAGRAMS article. Repair as necessary.
  3. Disconnect power transistor unit 6-pin connector. Disconnect ECU connector. Check continuity of each wire circuit between power transistor unit and corresponding wire terminal of ECU connector. See L - WIRING DIAGRAMS article.
  4. If continuity does not exist in any of power transistor 6-pin connector wire terminals, repair open circuit in wires. If there is continuity in all wires but one or more ignition coils is inoperative, reconnect all connectors. Go to ECU POWER TRANSISTOR OUTPUT SIGNAL test.
Factory Service Tools

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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.

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