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Power Transistor

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Mitsubishi Montero Sport, 2002 Mitsubishi Montero, 2002 Mitsubishi Mirage, 2002 Mitsubishi Lancer, and 2002 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Power transistor test must be performed in less than 10 seconds to prevent coil from burning and power transistor from breaking.
  1. Disconnect power transistor 6-pin and 3-pin connectors. To test section of power transistor that controls cylinders No. 1 and 4 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 3. See Fig 1.
  2. Using an analog ohmmeter, check for continuity between power transistor terminals No. 4 and 13 (connect negative ohmmeter probe to terminal No. 13). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
  3. To test section of power transistor that controls cylinders No. 2 and 5 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 2.
  4. Using an analog ohmmeter, check for continuity between power transistor terminals No. 4 and 12 (connect negative ohmmeter probe to terminal No. 12). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
  5. To test section of power transistor that controls cylinders No. 3 and 6 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 1.
  6. Using an analog ohmmeter, check for continuity between terminals No. 4 and 11 of power transistor (connect negative ohmmeter probe to terminal No. 11). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
Fig 1: Identifying Power Transistor Terminals (Montero & Montero Sport)
G95D31032Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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