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Ecu Power Transistor Output Signal

  1. Using a logic probe or DVOM with an analog bar graph function, and appropriate wiring diagram from WIRING DIAGRAMS article, carefully backprobe ECU power transistor trigger circuit terminals No. 1, 2, 8 and 9 while cranking engine. If all pulse signals are normal, go to step 3).
  2. If any circuit does not pulse, the ECU is not sending a trigger signal to the power transistor. Before condemning the ECU, check for a start signal while cranking. Using a DVOM, check for battery voltage signal at terminal No. 37 while holding ignition switch in the "START" position. If voltage remains at zero, repair start signal circuitry and retest.
  3. If all 4 output signals from ECU to the power transistor are okay, power transistor is defective and must be replaced.
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