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TCM Inspection [FS5A-El]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • The TCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the TCM is necessary to determine where the malfunction occurs.
  1. Disconnect the negative battery cable
  2. Remove the TCM. (See TCM REMOVAL/INSTALLATION [FS5A-EL] .)
  3. Connect the TCM connector.
  4. Connect the negative battery cable.
  5. Connect the voltmeter (-) lead to body GND.
  6. Measure the voltage at each terminal.
    • If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the "Inspection Item" column in the "TCM Terminal Voltage"
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