Mazda CX-7 2007 Workshop Manual page 1354

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Repair Procedure
1. Inspect the connector of malfunctioning module.
• If there is any malfunction, repair or replace the connector.
2. Inspect the malfunctioning wiring harnesses as follow:
• If there is any malfunction, repair or replace the wiring harnesses.
• If there is no malfunction, replace the malfunctioning module.
— Short to GND
— Short to power supply
— Twisted pair short each other
— Open circuit
3. Make sure to reconnect all disconnected connectors.
4. Clear the CAN system related DTCs using the M-MDS.
5. Verify if the CAN system related DTCs are displayed using the M-MDS.
• If the same following DTCs are present, replace the malfunctioning module.
— U0073 (PCM, TCM, DSC HU/CM, AWD control module, BCM, SAS control module, keyless control
module, instrument cluster)
— U0516 (Climate control unit)
— U2516 (Instrument cluster, information display)
— 16:Er12 (Audio unit (base module))
• If other DTC is present, perform the appropriate DTC inspection. (See 09-02D-7 DTC TABLE[MULTIPLEX
COMMUNICATION SYSTEM].)
End Of Sie
DTC U0073[MULTIPLEX COMMUNICATION SYSTEM]
PCM
TCM
DSC HU/CM
AWD control module
DTC U0073
BCM
SAS control module
Keyless control module
Instrument cluster
Warning
• Detection conditions are for understanding the DTC outline before performing an inspection.
Performing an inspection according to only detection conditions may cause injury due to
DETECTION
operating error, or damage the system. When performing an inspection, always follow the
CONDITION inspection procedure.
• CAN system related harness malfunction
• Related module communication error
• Open or short circuit in wiring harness
• Malfunction of connectors between PCM, TCM, DSC HU/CM, AWD control module, BCM, SAS control
module, keyless control module, instrument cluster
• PCM malfunction
• TCM malfunction
POSSIBLE
• DSC HU/CM malfunction
CAUSE
• AWD control module malfunction
• BCM malfunction
• SAS control module malfunction
• Keyless control module malfunction
• Instrument cluster malfunction
09-02D–14
CAN system communication error
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