Power Transistor

1992 Isuzu Rodeo LS, 4WD, StandardSECTION Power Transistor
  1. Ensure ignition is off. Remove coil wire from distributor cap. Attach Spark Tester (J-26792) , or, using insulated pliers, hold distributor terminal end of coil wire about 1/4" (5 mm) from metal surface.
  2. Disconnect and remove power transistor from under intake manifold. This involves removing right front wheel and rubber inner fender panel cover for access to power transistor.
  3. Connect jumper wire between harness connector and power transistor connector on Blue wire terminal. Connect negative end of 1.5-volt "D" battery to other power transistor terminal (Green wire). See Fig 1 .
  4. Connect positive end of 1.5-volt "D" battery to other harness terminal (Yellow wire). Ground power transistor.
  5. Turn ignition on with engine off. Disconnect and connect jumper lead at power transistor connector several times. Verify spark is jumping across air gap at spark tester. If spark does not occur, check wiring for continuity or shorts. If wiring is okay, replace power transistor.
Fig 1: Testing Power Transistor Circuit
G91H16631Courtesy of ISUZU MOTOR CO.
RENDER: 1.0x

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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.