Mazda Mazda6 Workshop Manual Supplement page 710

STEP
4 INSPECT 4WD CM TO DIFFERENTIAL OIL
TEMPERATURE SENSOR FOR SHORT TO
GROUND
• Inspect for continuity between 4WD CM
terminal A and ground.
• Is there continuity?
5 INSPECT 4WD CM TO DIFFERENTIAL OIL
TEMPERATURE SENSOR FOR OPEN
CIRCUIT
• Inspect for continuity between 4WD CM
terminal C and differential oil temperature
sensor terminal B.
• Is there continuity?
6 INSPECT 4WD CM TO DIFFERENTIAL OIL
TEMPERATURE SENSOR FOR SHORT TO
GROUND
• Inspect for continuity between 4WD CM
terminal C and ground.
• Is there continuity?
7 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory.
(See M–76 Clearing DTCs
• Drive vehicle.
• Is the same DTC present?
8 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
End Of Sie
DTC U0100
DTC U0100
• 4WD CM detects that communication signals (throttle opening angle and engine speed signals) from
DETECTION
CONDITION PCM are abnormal.
POSSIBLE
• PCM signals have communication error.
CAUSE
Diagnostic Procedure
• Inspect according to the diagnostic procedure in Section T. (See
SYSTEM.)
End Of Sie
DTC U0101
DTC U0101
• 4WD CM detects that communication signals (selector lever position and gear position signals) from
DETECTION
CONDITION TCM are abnormal.
POSSIBLE
• TCM signals have communication error.
CAUSE
Diagnostic Procedure
• Inspect according to the diagnostic procedure in Section T. (See
SYSTEM.)
End Of Sie
DTC U0121
DTC U0121
• 4WD CM detects that communication signals (four-wheel speed, ABS/DSC operation condition, and
DETECTION
CONDITION coupling torque request signals) from DSC HU/CM are abnormal.
POSSIBLE
• DSC HU/CM signals have communication error.
CAUSE
Diagnostic Procedure
• Inspect according to the diagnostic procedure in Section T. (See
SYSTEM.)
End Of Sie
M–80
ON-BOARD DIAGNOSTIC
INSPECTION
Procedures)
PCM communication
TCM communication
ABS/DSC communication
Yes Repair or replace harness for short to ground between 4WD
CM and differential oil temperature sensor, then go to Step
7.
No Go to next step.
Yes Go to next step.
No Repair or replace harness for open circuit between 4WD CM
and differential oil temperature sensor, then go to Step 7.
Yes Repair or replace harness for short to ground between 4WD
CM and differential oil temperature sensor, then go to next
step.
No Replace 4WD CM, then go to next step.
Yes Replace 4WD CM, then go to next step.
No Go to next step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
T–39 MULTIPLEX COMMUNICATION
T–39 MULTIPLEX COMMUNICATION
T–39 MULTIPLEX COMMUNICATION
ACTION
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A6E637027100207