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Procedures For Determining The Location Of A Malfunction: Pcm

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 U0101, U0121 and/or U0155, 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
ABS/TCS HU/CM TCM Instrument cluster
PCM (2) (2) (2)
  • Wiring harness A
  • PCM
(2) (1) (1)
  • Wiring harness B
  • ABS/TCS HU/CM
(1) (2) (2)
  • Wiring harness C
(1) (2) (1)
  • Wiring harness D
  • TCM
(1) (1) (2)
  • Wiring harness E
  • Instrument cluster
(1) Normal
(2) Communication error
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