Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHRYSLER2003PT CRUISER GT, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTINGCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULEPOWER & GROUND CIRCUITS
2003 Chrysler PT Cruiser GT, Automatic
Power & Ground Circuits
2003 Chrysler PT Cruiser GT, AutomaticSECTION 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
- 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.
- 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.
- 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.
RENDER: 1.0x
NO RELATED
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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.