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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 68RFE Automatic Transmission)) >> Diagnosis and Testing >> P0883-TCM Power Input High >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The PCM/TCMl Relay is used to supply power (Transmission Control Output) to the Transmission Solenoid/TRS Assembly when in normal operating mode and to pins C4 - 19, C4 - 28 and C4 - 38 of the PCM. The purpose of the PCM/TCM Relay is to allow the Powertrain Control Module (PCM) to turn off the power to the Transmission Solenoid/TRS Assembly in event that the transmission should need to be placed into "limp-in" mode due to a DTC.

After a PCM reset, (ignition switch turned to the run position, or after cranking engine) the PCM verifies that the PCM/TCM Relay contacts are open by checking for voltage on the Transmission Control Output circuit before the PCM/TCM Relay is energized. If voltage is detected, the DTC will set.

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