Control Circuit Testing

2008 Jeep Wrangler X, AutomaticSECTION Control Circuit Testing

The starter control circuit components should be tested in the order in which they are listed, as follows:

  1. Starter Relay  - Refer to RELAY - STARTER MOTOR . The starter relay is located within the TIPM (Totally Integrated Power Module). Refer to "no crank condition" in STARTING - ELECTRICAL DIAGNOSTICS .
  2. Starter Solenoid  - Refer to MOTOR - STARTER .
  3. Ignition Switch  - Refer to IGNITION SWITCH and KEY CYLINDER .
  4. Clutch Pedal Position Switch  - If equipped with manual transmission, refer to SWITCH-CLUTCH PEDAL POSITION .
  5. Park/Neutral Position Switch  - If equipped with automatic transmission, refer to TRANSMISSION RANGE SENSOR .
  6. Wire harnesses and connections  - Refer to SYSTEM WIRING DIAGRAMS .
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.