Mazda Mazda6 Workshop Manual Supplement page 860

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

• Is vehicle equipped with DSC?

INSPECT WIRING HARNESS BETWEEN PCM

AND DSC HU/CM

• Disconnect DSC HU/CM connector.

• Inspect the following wiring harness between

PCM and DSC HU/CM terminals for short to

ground, short power supply, and open circuit:

Except MZR-CD (RF Turbo)

— 2R—AF (CAN_L)

— 2U—AG (CAN_H)

MZR-CD (RF Turbo)

— 39—AF (CAN_L)

— 13—AG (CAN_H)

• Is wiring harness okay?

INSPECT WIRING HARNESS BETWEEN PCM

AND ABS (ABS/TCS) HU/CM

• Disconnect ABS (ABS/TCS) HU/CM

• Inspect the following wiring harness between

PCM and ABS (ABS/TCS) HU/CM terminals

for short to ground, short power supply, and

open circuit:

Except MZR-CD (RF Turbo)

— 2R—R (CAN_L)

— 2U—O (CAN_H)

MZR-CD (RF Turbo)

— 39—R (CAN_L)

— 13—O (CAN_H)

• Is wiring harness okay?

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

DETERMINING THE LOCATION OF A

• Determine the malfunctioning part of the

T–42 PROCEDURES FOR

DETERMINING THE LOCATION OF A

MALFUNCTION)