Mazda 6 2002, Workshop Manual

Page: 1043 / 1248

T–144
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
DTC U0073, U1900, U2516
A6E816255430W05
Diagnostic procedure
DTC
U0073
CAN system communication error
U1900
U2516 CAN system wiring harness open and short circuit
DETECTION
CONDITION
Warning
•
Detection conditions are for understanding DTC outline before performing inspection.
Performing inspection with only detection conditions may cause injury due to operating error
or damage the system. When performing inspection, always follow inspection procedure.
•
CAN system related harness malfunction
•
Related module communication error
POSSIBLE
CAUSE
•
Open or short circuit in wiring harness
•
Malfunction of connectors between PCM, ABS (ABS/TCS) HU/CM or DSC HU/CM and Instrument
cluster
•
PCM malfunction
•
ABS (ABS/TCS) HU/CM malfunction (with ABS (ABS/TCS))
•
DSC HU/CM malfunction (with DSC)
•
Instrument cluster malfunction
STEP INSPECTION ACTION
1 DETERMINING THE LOCATION OF A
MALFUNCTION
•
Determine the malfunctioning part of the
CAN system.
(See
T–142 PROCEDURES FOR
DETERMINING THE LOCATION OF A
MALFUNCTION
)
•
Is the malfunctioning part the wiring harness
C or the instrument cluster?
Yes Go to Step 4.
No Go to next step.
2 DETERMINING THE LOCATION OF A
MALFUNCTION
•
Is the malfunctioning part the wiring harness
B or the ABS (ABS/TCS) HU/CM? (with ABS
(ABS/TCS))
•
Is the malfunctioning part the wiring harness
B or the DSC HU/CM? (with DSC)
Yes Go to Step 8.
No Go to next step.
3 DETERMINING THE LOCATION OF A
MALFUNCTION
•
Is the malfunctioning part the wiring harness
A or the PCM?
Yes Go to Step 12.
No Troubleshooting completed.
4 INSPECT INSTRUMENT CLUSTER
CONNECTOR
•
Disconnect negative battery cable.
•
Disconnect instrument cluster connector.
•
Is poor connection detection bars of
instrument cluster connector okay?
Yes Go to next step.
No Replace wiring harness.
5
•
Is vehicle equipped with DSC? Yes Go to next step.
No Go to Step 7.