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.
2009 Chrysler 300 V6-2.7LFACTORY OEM SERVICE PROCEDURE
Ignition Circuit Sense
OPERATION - IGNITION CIRCUIT SENSE
When the ignition key is inserted, the position of the key is transmitted via the CAN bus to Integrated Power Module (IPM). When the key position is rotated to the ACC position or Run/Start position, the IPM energizes the Ignition ACC and/or Run/Start feed which will wake up the Powertrain Control Module (PCM) accordingly. These feeds are essentially fused switched battery voltage feeds fabricated by the IPM with relays or solid state devices. There is not Ignition Start feed to the PCM - this is handled by a CAN bus message from IPM to PCM. NOTE: Only on those applications with the 42RLE does the PCM receive an Ignition ACC feed.
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.