2003 Chrysler PT Cruiser Base, StandardFACTORY OEM SERVICE PROCEDURE

Power & Ground Circuits

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS  . After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-1 under VERIFICATION TESTS in SELF-DIAGNOSTICS - PT CRUISER article to ensure system is functioning properly.

Possible Causes:

  • PCM Fused B+ Circuit
  • PCM Fused Ignition Switch Output Circuit
  • PCM Ground Circuits

Testing

  1. Turn ignition off. Disconnect PCM harness connectors. PCM is located on left side of engine compartment, near air filter housing. See Fig 1 . Connect a test light to ground, probe the PCM fused B+ circuit in the pinout box. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open in fused battery voltage circuit.
  2. Turn ignition on. Connect a test light to ground, probe the PCM fused ignition switch output circuit in the pinout box. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open in fused ignition switch output circuit.
  3. Turn ignition off. Using a test light connected to battery positive, individually probe the PCM ground circuits. If test light illuminates at each ground circuit, ground circuits are okay. Test is complete. If test light does not illuminate at each ground circuit, repair open in appropriate ground circuit.
Fig 1: Locating Inlet Air Temperature Sensor & PCM
G00030276Courtesy of DAIMLERCHRYSLER CORPORATION
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.