Mazda CX-7 2007 Workshop Manual page 1355

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
PCM
TCM
DSC HU/CM
AWD control module
DTC U0073
BCM
SAS control module
Keyless control module
Instrument cluster
FRONT HARNESS
1AM
PCM
1AI
A14 A6
TCM
Diagnostic procedure
STEP
1 INSPECT CAN SYSTEM-RELATED DTC
• Are any DTCs other than the following
displayed?
— U0073
2 INSPECT CONNECTOR
• Inspect the connector of the module that
outputs the DTC.
• Is it normal?
3 INSPECT WIRING HARNESSES
• Inspect for the following malfunctioning
wiring harnesses:
— Short to GND
— Short to power supply
— Twisted pair short each other
— Open circuit
• Is there any malfunction?
4 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC using the M-MDS.
• Is the same DTC present?
End Of Sie
CAN system communication error
DSC HU/CM
X W
BCM
G
AWD
CNTROL
MODULE
EMISSION HARNESS
INSPECTION
SAS
CONTROL
MODULE
REAR HARNESS
2E 2F
5L 3X
BCM
5I 3W
H
INSTRUMENT PANEL
HARNESS
Yes Determine malfunctioning part in CAN system.
(See 09-02D-8 PROCEDURES FOR DETERMINING THE
LOCATION OF A MALFUNCTION[MULTIPLEX
COMMUNICATION SYSTEM])
No Go to the next step.
Yes Go to the next step.
No Repair or replace the connector, then go to Step 4.
Yes Repair or replace the wiring harness, then go to the next
step.
No Go to the next step.
Yes Replace the module that outputs the DTC, then retry this
step.
No Troubleshooting completed.
KEYLESS
CONTROL
MODULE
3X 3W
2R
INSTRUMENT
CLUSTER
2T
F
E
DLC-2
:
CAN_H
: CAN_L
ACTION
09-02D–15
09-02D