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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 ignition coil connector terminal identifications. For wire colors and related ECU connector terminals, see L - WIRING DIAGRAMS article.
  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.
  4. If continuity does not exist in any of the 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.
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