Mazda 6 MPS 2005, Дополнение к руководству по обучению, Страница: 109 / 112

Driveline/Axle
Diagnostics
•
When the ignition key is turned to the ON position, the 4WD CM begins operation, and
the 4WD warning light illuminates for 3 seconds while the system checks for open
circuits, monitors the condition of the power supply voltage and checks for internal
malfunctions.
•
Then, once the system is running, the system checks the operating conditions of the
4WD solenoid and the differential oil temperature sensor at regular intervals to determine
whether there is any malfunction.
•
If any malfunction is detected during these diagnostic tests, the warning light illuminates
according to the malfunction to alert the driver and fail-safe functions are applied as well
as a DTC is stored in the 4WD CM.
•
Once a DTC is stored, it is not cleared even if the input/output signal system malfunction
returns to normal when the ignition key is turned to the LOCK position (engine OFF).
•
Since DTCs are stored in the non-volatile memory inside the 4WD CM, they are not
cleared even if the battery is disconnected. Therefore, it is necessary to clear the
memory when maintenance has been completed.
•
When the failure detection function determines that there is a malfunction, the 4WD
warning light illuminates to alert the driver. At this time, the fail-safe function suspends
control to ensure that driving stability is not lost.
•
Certain DTCs are provided to make diagnostics easier. A complete 4WD CM inspection
has to be done with the aid of a Terminal Voltage List for reference which can be found
in the Workshop Manual.
DTC Table
DTC Malfunction Location 4WD Warning Light
Condition
DTC Stored in
Memory
Control
Condition
P1887 System wiring Illuminated X Stop
P1888 Differential oil
temperature sensor
Illuminated X Stop
U0073 CAN system
communication error
Illuminated X Stop
U0100 PCM communication
system
Illuminated X Stop
U0121 DSC communication
system
Illuminated *1 X Stop *2
M6-MPS_03T002
*1 : Does not illuminate when only the coupling torque request signal from the DSC HU/CM cannot be
received.
*2 : Only integrated DSC control is prohibited when only the coupling torque request signal from the
DSC HU/CM cannot be received.
Service Training Mazda6 MPS Supplement 03-29