Mazda 6 2002 Workshop Manual page 995

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
PCM
1. Check the display of DTC U0121 and/or U0155, using the SST (WDS or equivalent). (See
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
• • • • ABS (ABS/TCS) HU/CM
• • • • DSC HU/CM
PCM
ABS/TCS HU/CM or DSC HU/CM
1. Accec and monitor the “PCM MSG” and “IC MSG”of PID using the SST (WDS or equivalent).
2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See
TABLE.)
3. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
• ABS (ABS/TCS)
HU/CM
• DSC HU/CM
Instrument Cluster
1. Accec and monitor the “PCM MSG” and “ABS MSG” of PID using the SST (WDS or equivalent).
2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See
TABLE.)
3. Referring to the following table, determine the malfunctioning part of the CAN system.
Module
Instrument cluster
End Of Sie
Communication status
Instrument cluster
—
—
X
Communication status
PCM Instrument cluster
—
—
X
Communication status
• • • • ABS (ABS/TCS) HU/CM
PCM
• • • • DSC HU/CM
—
—
X
Malfunction location
• Wiring harness A
—
• PCM
• Wiring harness B
X • ABS (ABS/TCS) HU/CM
• DSC HU/CM
• Wiring harness C
—
• Instrument cluster
T–142 PID/DATA MONITOR
Malfunction location
• Wiring harness B
— • ABS (ABS/TCS) HU/CM
• DSC HU/CM
• Wiring harness A
X
• PCM
• Wiring harness C
—
• Instrument cluster
T–142 PID/DATA MONITOR
Malfunction location
• Wiring harness C
—
• Instrument cluster
• Wiring harness A
X
• PCM
• Wiring harness B
— • ABS (ABS/TCS) HU/CM
• DSC HU/CM
T–142 DTC TABLE.)
X: Normal
—: Communication error
X: Normal
—: Communication error
X: Normal
—: Communication error
T–143
T