Mazda Mazda6 Workshop Manual Supplement page 862

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
STEP
31 INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
— R—H (CAN_L)
— O—G (CAN_H)
• Is wiring harness okay?
32 INSPECT ABS (ABS/TCS) HU/CM OR DSC
HU/CM CONNECTOR
• Disconnect negative battery cable.
• Disconnect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
• Is the connector for the ABS (ABS/TCS) HU/
CM or DSC HU/CM connected correctly?
• Is vehicle equipped with DSC?
33
34 INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND 4WD CONTROL MODULE
• Disconnect DSC HU/CM connector.
• Inspect the following wiring harness between
DSC HU/CM and 4WD control module
terminals for short to ground, short power
supply, and open circuit:
— AF—H (CAN_L)
— AG—G (CAN_H)
• Is wiring harness okay?
35 INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
— R—H (CAN_L)
— O—G (CAN_H)
• Is wiring harness okay?
• Is vehicle equipped with DSC?
36
37 INSPECT WIRING HARNESS BETWEEN TCM
AND DSC HU/CM
• Disconnect TCM connector.
• Inspect the following wiring harness between
TCM and DSC HU/CM terminals for short to
ground, short power supply, and open circuit:
— 2J—AF (CAN_L)
— 2M—AG (CAN_H)
• Is wiring harness okay?
38 INSPECT WIRING HARNESS BETWEEN TCM
AND ABS (ABS/TCS) HU/CM
• Disconnect TCM connector.
• Inspect the following wiring harness between
TCM and ABS (ABS/TCS) HU/CM terminals
for short to ground, short power supply, and
open circuit:
— 2J—R (CAN_L)
— 2M—O (CAN_H)
• Is wiring harness okay?
T–50
INSPECTION
Yes Go to Step 45.
No Replace wiring harness.
Yes Go to next step.
No Replace wiring harness.
Yes Go to next step.
No Go to step 35.
Yes Replace DSC HU/CM, then go to Step 45.
No Replace wiring harness.
Yes Replace ABS (ABS/TCS) HU/CM, then go to Step 45.
No Replace wiring harness.
Yes Go to next step.
No Go to step 38.
Yes Go to Step 45.
No Replace wiring harness.
Yes Go to Step 45.
No Replace wiring harness.
ACTION