ON-BOARD DIAGNOSTIC
03-02–2
Self-diagnostic Function
Failure detection function
• The failure detection function detects malfunctions in the input/output signal systems of the AWD CM and
displays them when the ignition key is at the ON position.
• When the ignition key is turned to the ON position, the AWD CM system begins operation, and the AWD
warning light illuminates for 3 seconds while the function checks for open circuits. At the same time the function
monitors the condition of the power supply voltage and checks for internal malfunctions.
• Then, once the system is running, the function checks the operating conditions of the AWD 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. Also, a DTC is output to DLC-2 via the CAN line. Also, at the same time the
failure detection result is sent to the memory and fail-safe functions.
Memory function
• This function stores DTCs for malfunctions of the input/output signal systems as determined by the failure
detection function. 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 AWD CM, they are not cleared even if the battery
is disconnected. Therefore, it is necessary to clear the memory when maintenance has been completed. For
clearing DTCs, refer to the procedures in the Workshop Manual.
Fail-safe function
• When the failure detection function determines that there is a malfunction, the AWD warning light illuminates to
alert the driver. At this time, the fail-safe function suspends control or takes other measures to ensure that
driving stability is not lost.
X:Available
External Tester Communication Function
• This function allows for the storing and clearing of DTCs due to a communication link between the AWD CM
and an external tester.
End Of Sie
DTC Malfunction location
AWD warning light
condition
DTC stored in
memory
Control condition
P1887 AWD solenoid circuit Illuminated X Stop
P1888 Differential oil temperature sensor circuit Illuminated X Stop
U0073 CAN system communication error Illuminated X Stop
U0100 Communication error to PCM Illuminated X Stop
U0101 Communication error to TCM Illuminated X Stop
U0121 Communication error to DSC/RSC HU/CM Illuminated X Stop
U0155 Communication error to instrument cluster Illuminated X Stop
3423-1U-06H(03-02).fm 2 ページ ２００６年１１月２１日 火曜日 午後５時８分
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