Mazda 2006 MX-5 Service Highlights page 491

Example (PCM-related communication error)
Note
• This example is for MT with DSC.
1. DTCs for the PCM, DSC HU/CM, steering angle sensor and instrument cluster can be verified using the WDS
or equivalent.
Module
PCM
DSC HU/CM
Instrument cluster
PCM
: TWISTED PAIR
2. If there is a communication error between the instrument cluster and PCM, even if the communication between
the DSC HU/CM and the instrument cluster is normal, it is probable that there is a malfunction in the PCM or
PCM-related wiring harnesses.
End Of Sie
CONTROL SYSTEM
Displayed DTC
U0073 PCM-related CAN system malfunction
U0121 Communication error between PCM and DSC HU/CM
U0155 Communication error between PCM and instrument cluster
U0100 Communication error between DSC HU/CM and PCM
U0100 Communication error between instrument cluster and PCM
DSC HU/CM
COMMUNICATION
ERROR
COMMUNICATION
ERROR
Probable malfunction location
NORMAL
INSTRUMENT CLUSTER
DLC-2
09–40
E5U940ZS5004
09–40–7