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P1A03 - Drive Motor A Shutdown Circuit

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P1A03 - DRIVE MOTOR A SHUTDOWN CIRCUIT

Description:  The transaxle control module (TCM) continuously monitors the motor shutdown (MSDN) circuit and the controller area network (CAN) signal for a MSDN request from the powertrain control module (PCM). This DTC is set when the PCM requests traction motor shutdown through the CAN signal or if there is an MSDN circuit concern. The traction motor inverter will be disabled.
Possible Causes: 
  • MSDN circuit open
  • MSDN circuit short to PWR or GND
  • PCM MSDN request
  • Damaged TCM
  • Damaged PCM
Diagnostic Aids:  With the PCM and TCM connected and the key in ON position, check the MSDN signal frequency. If the frequency is between 49 and 75 Hz DC, no circuit problem is indicated and PCM traction motor shutdown is requested.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST QE .
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