Mazda Mazda6 Workshop Manual Supplement page 863

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
STEP
39 INSPECT TCM CONNECTOR
• Disconnect negative battery cable.
• Disconnect TCM connector.
• Is the connector for the TCM connected
correctly?
• Is vehicle equipped with DSC?
40
41 INSPECT WIRING HARNESS BETWEEN TCM
AND DSC HU/CM
• Disconnect DSC HU/CM 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?
42 INSPECT WIRING HARNESS BETWEEN TCM
AND ABS (ABS/TCS) HU/CM
• Disconnect ABS (ABS/TCS) HU/CM
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?
43 INSPECT PCM CONNECTOR
• Disconnect negative battery cable.
• Disconnect PCM connector.
• Is the connector for the PCM connected
correctly?
44 INSPECT WIRING HARNESS BETWEEN TCM
AND PCM
• Disconnect TCM connector.
• Inspect the following wiring harness between
TCM and PCM terminals for short to ground,
short power supply, and open circuit:
— 2J—2R (CAN_L)
— 2M—2U (CAN_H)
• Is wiring harness okay?
45 CHECK DTC INDICATE
• Connect PCM connector.
• Connect TCM connector.
• Connect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
• Connect 4WD control module connector.
• Connect instrument cluster connector.
• Clear DTC from module memory using SST
(WDS or equivalent).
• Perform KOEO/KOER self-test.
• Are DTC's U0073, U1900 and/or U2516
indicated?
End Of Sie
INSPECTION
Yes Go to next step.
No Replace wiring harness.
Yes Go to next step.
No Go to step 42.
Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
Yes Go to next step.
No Replace wiring harness.
Yes Replace PCM, then go to next step.
No Replace wiring harness.
Yes Repeat from Step 18.
No Troubleshooting completed.
ACTION
T–51
T