Mazda RX-8 2004 Service Highlights page 538

Flowchart
START
Verify that DTCs are displayed for PCM, TCM, ABS HU/CM, DSC HU/CM, EPS control module,
keyless control module, TPMS control module and instrument cluster.
Are any DTCs display?
Verify that PID/data monitor is displayed for instrument cluster.
ABS_MSG
TCM_MSG
PCM_MSG
EPS_MSG
TPMS_MSG
See below table for DTC and malfunction location.
Determine the malfunctioning part of the CAN system.
END
Example (PCM-related communication error)
Note
• This example is for MT with ABS.
1. DTCs for the PCM, ABS HU/CM and instrument cluster can be verified using a SST (WDS or equivalent).
Module
PCM
ABS HU/CM
Instrument cluster
PCM
: TWISTED PAIR
09–40–8
CONTROL SYSTEM
Yes
Displayed DTC
U0073
U0121
U0155
U1900, U2516
U1900, U2516
NO GOOD
ABS HU/CU
No
END
Probable malfunction location
PCM-related CAN system malfunction
Communication error between PCM and ABS HU/CM
Communication error between PCM and instrument cluster
ABS HU/CM-related CAN system malfunction
Instrument cluster-related CAN system malfunction
DLC-2
NO GOOD
CHU0940S005
INSTRUMENT
CLUSTER
CHU0940S003