Disconnect connector at ignition power transistor. Ignition power transistor is mounted on top of engine, near ignition coil and contains a 8-pin Black connector. See Figure .
To check ignition power transistor for cylinders No. 1 and 4, connect analog type ohmmeter between terminals No. 3 and 8 on ignition power transistor. See Fig 1 . Ensure negative lead of ohmmeter is on terminal No. 8 and positive lead of ohmmeter is on terminal No. 3.
A 1.5-volt battery will be used as the power supply. Connect negative terminal of a 1.5-volt battery to terminal No. 3 on ignition power transistor. See Fig 1 .
Momentarily touch positive terminal of 1.5-volt battery to terminal No. 7 on ignition power transistor. Continuity should exist between terminals No. 3 and 8 on ignition power transistor when positive terminal of 1.5-volt battery is connected to terminal No. 7.
Disconnect positive terminal of 1.5-volt battery from terminal No. 7 on ignition power transistor. No continuity should now exist between terminals No. 3 and 8 on ignition power transistor. Replace ignition power transistor if continuity is not as specified.
To check ignition power transistor for cylinders No. 2 and 3, connect analog type ohmmeter between terminals No. 1 and 3 on ignition power transistor. See Fig 2 . Ensure negative lead of ohmmeter is on terminal No. 1 and positive lead of ohmmeter is on terminal No. 3.
Connect negative terminal of a 1.5-volt battery to terminal No. 3 on ignition power transistor. See Fig 2 .
Momentarily touch positive terminal of 1.5-volt battery to terminal No. 2 on ignition power transistor. Continuity should exist between terminals No. 1 and 3 on ignition power transistor when positive terminal of 1.5-volt battery is connected to terminal No. 2.
Disconnect positive terminal of 1.5-volt battery from terminal No. 2 on ignition power transistor. No continuity should now exist between terminals No. 1 and 3 on ignition power transistor. Replace ignition power transistor if continuity is not as specified.

Fig 1: Checking Ignition Power Transistor For Cylinders No. 1 & 4

Courtesy of CHRYSLER CORP.

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.

Safety Warning

Ignition Power Transistor

Use the Manual With the Right Hardware

When to See a Mechanic

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