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Internal variables are those that are within the control or influence of the system or entity being studied, while external variables are those that are outside of its control or influence. Internal variables are typically more easily manipulated in an experiment, while external variables are often more difficult to control for.
Internal Control Module Keep Alive memory
How do you change the wiper control module on a 2006 Ford Focus
There isn't an external relay. The FCM (front control module on the fuse box under the hood) controls the lights through internal circuitry.
P0601 Internal Control Module Memory Check Sum ErrorThe engine computer has failed.P0601 Internal Control Module Memory Check Sum ErrorThe engine computer has failed.
The computer needs replaced.
How do you change the ignition control module in a 1988 Chevy Silverado 5.7L
Trouble code P0606 means: Control Module Internal Performance Trouble code P0607 means: Control Module Performance
PO613 Transmission Control Module Fault. Internal failure of the module. Take the vehicle to a professional for repair.
External Air temperature control, the unit in the dash where you control the AC and Heater
I found the answer at http://www.obd-codes.com/p0601. It says that the Powertrain Control Module (PCM) needs to be replaced.
OBD-II code PO61B, Internal Control Module Torque Calculation ...