Power Transistor

To test power transistor coil for No. 1 and 4 cylinders, disconnect power transistor connector. Using a 1.5-volt dry cell battery, connect negative end of 1.5-volt battery to terminal No. 3 of power transistor and positive end of 1.5-volt battery to power transistor terminal No. 7 as shown in STEP 1. See Fig 1 .
Using an analog ohmmeter, check for continuity between terminals No. 3 and 8 of power transistor. Continuity should exist. With positive end of 1.5-volt battery disconnected, no continuity should exist. Replace power transistor if it does not test as specified.
To test power transistor coil for No. 2 and 4 cylinders, connect negative end of 1.5-volt dry cell battery to terminal No. 3 of power transistor and positive end of 1.5-volt battery to power transistor terminal No. 2 as shown in STEP 2. See Fig 2 .
Using an analog ohmmeter, check for continuity between terminals No. 1 and 3 of power transistor. Continuity should exist. With positive end of 1.5-volt battery disconnected, no continuity should exist. Replace power transistor if it does not test as specified.

Fig 1: Testing Power Transistor (Step 1)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Testing Power Transistor (Step 2)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.