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Procedures For Determining The Location Of A Malfunction: TCM

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the display of DTC U0100, U0121, U0140 and/or U0415 using the SST  (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]  .)
  2. Referring to the following table, determine the malfunctioning part of the CAN system.
MALFUNCTION LOCATION SPECIFICATION CHART

Module Communication status Malfunction location
PCM ABS/TCS HU/CM Instrument cluster
TCM (2) (2) (2)
  • Wiring harness D
  • TCM
(2) (1) (1)
  • Wiring harness A
  • PCM
(2) (2) (1)
  • Wiring harness C
(1) (2) (1)
  • Wiring harness B
  • ABS/TCS HU/CM
(1) (1) (2)
  • Wiring harness E
  • Instrument cluster
(1) Normal
(2) Communication error
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