Mazda 6 2002 Workshop Manual page 998

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
STEP
14 INSPECT WIRING HARNESS BETWEEN PCM
AND DSC HU/CM
• Disconnect negative battery cable.
• Disconnect DSC HU/CM connector.
• Inspect following wiring harness between
PCM and DSC HU/CM terminals for short to
ground, short power supply, and open circuit:
— 2R—AF (CAN_L)
— 2U—AG (CAN_H)
• Is wiring harness okay?
15 INSPECT WIRING HARNESS BETWEEN PCM
AND ABS (ABS/TCS) HU/CM
• Disconnect negative battery cable.
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Inspect following wiring harness between
PCM and ABS (ABS/TCS) HU/CM terminals
for short to ground, short power supply, and
open circuit:
— 2R—R (CAN_L)
— 2U—O (CAN_H)
• Is wiring harness okay?
16 CHECK DTC INDICATE
• Connect PCM connector.
• Connect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
• Connect instrument cluster connector.
• Clear DTC from module memory using SST
(WDS or equivalent).
• Perform KOEO/KOER self-test.
• Are DTCs U0073, U1900 and/or U2516
indicated?
End Of Sie
T–146
INSPECTION
Yes Replace PCM, then go to Step 16.
No Replace wiring harness.
Yes Replace PCM, then go to net step.
No Replace wiring harness.
Yes Repeat from Step 1.
No Troubleshooting completed.
ACTION