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.
2002 Chrysler Neon LE, AutomaticFACTORY OEM SERVICE PROCEDURE
No PCM Messages Recieved
NOTE:
After making any repairs, perform BODY VERIFICATION TEST
under VERIFICATION TESTS.
- Turn the ignition on. With the DRB, enter SYSTEM MONITORS, then J1850 MODULE SCAN. If the PCM is present on the bus, use DRB to erase DTCs. Cycle the ignition switch and check for DTCs. If DTC resets, replace the RKE module. See REMOTE KEYLESS ENTRY MODULE , under REMOVAL & INSTALLATION. If the PCM is not present on the bus, go to next step.
- Turn the ignition on. With the DRB, attempt to communicate with the PCM. If the DRB was able to communicate with the PCM, go to next step. If the DRB was not able to communicate with the PCM, diagnose and repair commubication problem. See SYMPTOM INDEX table in SELF-DIAGNOSTIC SYSTEM.
- Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the RKE module harness connector. Measure the resistance of the PCI Bus circuit between the RKE module connector and the PCM connector. If the resistance is less than 5 ohms, replace the powertrain control module. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION. If the resistance is more than 5 ohms, repair the PCI Bus circuit for an open.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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