2002 MAZDA 6 Tcm

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–47
T
5INSPECT INSTRUMENT CLUSTER
CONNECTOR
•Disconnect negative battery cable.
•Disconnect instrument cluster connector.
•Are poor connection detection bars of
instrument cluster connector okay?Yes Go to next step.
No Replace wiring harness.
6•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 8.
7INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND INSTRUMENT CLUSTER
•Disconnect DSC HU/CM connector.
•Inspect the 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?Yes Replace instrument cluster, then go to Step 17.
No Replace wiring harness.
8INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND INSTRUMENT
CLUSTER
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the 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?Yes Replace instrument cluster, then go to Step 17.
No Replace wiring harness.
9INSPECT 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 the connector for the ABS (ABS/TCS) HU/
CM or DSC HU/CM connected correctly?Yes Go to next step.
No Replace wiring harness.
10•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 12.
11INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND INSTRUMENT CLUSTER
•Disconnect DSC HU/CM connector.
•Inspect the 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?Yes Replace DSC HU/CM, then go to Step 17.
No Replace wiring harness.
12INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND INSTRUMENT
CLUSTER
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the 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?Yes Replace ABS (ABS/TCS) HU/CM, then go to Step 17.
No Replace wiring harness.
13INSPECT PCM CONNECTOR
•Disconnect negative battery cable.
•Disconnect TCM connector.
•Is the connector for the TCM connected
correctly?Yes Go to next step.
No Replace wiring harness. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–49
T
22DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
C?Yes Go to Step 36.
No Go to next step.
23DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
B or the TCM?Yes Go to Step 39.
No Go to next step.
24DETERMINING THE LOCATION OF A
MALFUNCTION
•Is the malfunctioning part the wiring harness
A or the PCM?Yes Go to Step 43.
No Go to next step.
25INSPECT INSTRUMENT CLUSTER
CONNECTOR
•Disconnect negative battery cable.
•Disconnect instrument cluster connector.
•Are poor connection detection bars of
instrument cluster connector okay?Yes Go to next step.
No Replace wiring harness.
26INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND 4WD
CONTROL MODULE
•Disconnect 4WD control module connector.
•Inspect the following wiring harness between
4WD control module and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
—H—2W (CAN_L)
—G—2X (CAN_H)
•Is wiring harness okay?Yes Replace instrument cluster, then go to Step 45.
No Replace wiring harness.
27INSPECT 4WD CONTROL MODULE
CONNECTOR
•Disconnect negative battery cable.
•Disconnect 4WD control module connector.
•Is the connector for the 4WD control module
connected correctly?Yes Go to next step.
No Replace wiring harness.
28INSPECT WIRING HARNESS BETWEEN 4WD
CONTROL MODULE AND INSTRUMENT
CLUSTER
•Disconnect instrument cluster connector.
•Inspect the following wiring harness between
4WD control module and instrument cluster
terminals for short to ground, short power
supply, and open circuit:
—H—2W (CAN_L)
—G—2X (CAN_H)
•Is wiring harness okay?Yes Replace 4WD control module, then go to Step 45.
No Replace wiring harness.
29•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 31.
30INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND 4WD CONTROL MODULE
•Disconnect DSC HU/CM connector.
•Inspect the following wiring harness between
DSC HU/CM and 4WD control module
terminals for short to ground, short power
supply, and open circuit:
—AF—H (CAN_L)
—AG—G (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness. STEP INSPECTION ACTION

T–50
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
31INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
—R—H (CAN_L)
—O—G (CAN_H)
•Is wiring harness okay?Yes Go to Step 45.
No Replace wiring harness.
32INSPECT 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 the connector for the ABS (ABS/TCS) HU/
CM or DSC HU/CM connected correctly?Yes Go to next step.
No Replace wiring harness.
33•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 35.
34INSPECT WIRING HARNESS BETWEEN DSC
HU/CM AND 4WD CONTROL MODULE
•Disconnect DSC HU/CM connector.
•Inspect the following wiring harness between
DSC HU/CM and 4WD control module
terminals for short to ground, short power
supply, and open circuit:
—AF—H (CAN_L)
—AG—G (CAN_H)
•Is wiring harness okay?Yes Replace DSC HU/CM, then go to Step 45.
No Replace wiring harness.
35INSPECT WIRING HARNESS BETWEEN ABS
(ABS/TCS) HU/CM AND 4WD CONTROL
MODULE
•Disconnect ABS (ABS/TCS) HU/CM
connector.
•Inspect the following wiring harness between
ABS (ABS/TCS) HU/CM and 4WD control
module terminals for short to ground, short
power supply, and open circuit:
—R—H (CAN_L)
—O—G (CAN_H)
•Is wiring harness okay?Yes Replace ABS (ABS/TCS) HU/CM, then go to Step 45.
No Replace wiring harness.
36•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 38.
37INSPECT WIRING HARNESS BETWEEN TCM
AND DSC HU/CM
•Disconnect TCM 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?Yes Go to Step 45.
No Replace wiring harness.
38INSPECT WIRING HARNESS BETWEEN TCM
AND ABS (ABS/TCS) HU/CM
•Disconnect TCM 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?Yes Go to Step 45.
No Replace wiring harness. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–51
T
End Of Sie
39INSPECT TCM CONNECTOR
•Disconnect negative battery cable.
•Disconnect TCM connector.
•Is the connector for the TCM connected
correctly?Yes Go to next step.
No Replace wiring harness.
40•Is vehicle equipped with DSC? Yes Go to next step.
No Go to step 42.
41INSPECT 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?Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
42INSPECT 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?Yes Replace TCM, then go to Step 45.
No Replace wiring harness.
43INSPECT PCM CONNECTOR
•Disconnect negative battery cable.
•Disconnect PCM connector.
•Is the connector for the PCM connected
correctly?Yes Go to next step.
No Replace wiring harness.
44INSPECT 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?Yes Replace PCM, then go to next step.
No Replace wiring harness.
45CHECK 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?Yes Repeat from Step 18.
No Troubleshooting completed. STEP INSPECTION ACTION