Mazda 2002 6 Workshop Manual page 1044

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
STEP
6 INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND INSTRUMENT CLUSTER
• Disconnect DSC HU/CM connector.
• Inspect following wiring harness between
DSC HU/CM and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
— AF—2W (CAN_L)
— AG—2X (CAN_H)
• Is wiring harness okay?
7 INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND INSTRUMENT
CLUSTER
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Inspect following wiring harness between
ABS (ABS/TCS) HU/CM and instrument
cluster terminals for short to ground, short
power supply, and open circuit:
— R—2W (CAN_L)
— O—2X (CAN_H)
• Is wiring harness okay?
8 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 poor connection detection bars of ABS
(ABS/TCS) HU/CM or DSC HU/CM
connector okay?
• Is vehicle equipped with DSC?
9
10 INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND INSTRUMENT CLUSTER
• Disconnect instrument cluster connector.
• Inspect following wiring harness between
DSC HU/CM and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
— AF—2W (CAN_L)
— AG—2X (CAN_H)
• Is wiring harness okay?
11 INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND INSTRUMENT
CLUSTER
• Disconnect instrument cluster connector.
• Inspect following wiring harness between
ABS (ABS/TCS) HU/CM and instrument
cluster terminals for short to ground, short
power supply, and open circuit:
— R—2W (CAN_L)
— O—2X (CAN_H)
• Is wiring harness okay?
12 INSPECT PCM CONNECTOR
• Disconnect negative battery cable.
• Disconnect PCM connector.
• Is poor connection detection bars of PCM
connector okay?
• Is vehicle equipped with DSC?
13
INSPECTION
Yes Replace instrument cluster, then go to Step 16.
No Replace wiring harness.
Yes Replace instrument cluster, then go to Step 16.
No Replace wiring harness.
Yes Go to next step.
No Replace wiring harness.
Yes Go to next step.
No Go to Step 11.
Yes Replace DSC HU/CM , then go to Step 16.
No Replace wiring harness.
Yes Replace ABS (ABS/TCS) HU/CM , then go to Step 16.
No Replace wiring harness.
Yes Go to next step.
No Replace wiring harness.
Yes Go to next step.
No Go to Step 15.
ACTION
T–145
T