Mazda 6 2002 - Page 1143

ON-BOARD DIAGNOSTIC
U53
U
DIAGNOSTIC TROUBLE CODE NUMBER INSPECTION
A6E857001038W01
1. Remove the glove compartment.
2. Short the A/C check connector to the GND
terminal using a jumper wire.
3. Shine a 60 W incandescent light from a height of
approximately 100 mm {3.9 in} onto the solar
radiation sensor.
Note
• When incandescent light does not shine on
the solar radiation sensor, the climate
control unit determines a malfunction and
indicates a diagnostic trouble code 02.
4. Turn the ignition switch to ON position.
5. Read DTCs from the flashing of the rear defroster
indicator light on the climate control unit. Carry out DTC inspection. (present and past failure indication modes)
• When the system is normal, the rear defroster indicator light does not flash.
• If any of the diagnostic trouble codes are indicated, carry out troubleshooting according to the code.
6. After completion of repairs, erase all diagnostic trouble code(s) from memory. (See U53 Erasing Past Failure
Memory.)
7. Remove the jumper wire.
Present Failure Indication Mode
• The on-board diagnostic function display the present failure indication mode directly after start up. In present
failure indication mode, present failures in the control system circuits (open, short circuits) are detected, and
the flashing of the rear defroster indicator light on the climate control unit indicates the DTCs.
 If a diagnostic trouble code is indicated, refer to the following diagnostic trouble code table and inspect the
appropriate system.
Past Failure Indication Mode
• While in present failure indication mode, press the A/C switch to change to the past failure indication mode. In
past failure indication mode, past failures (intermittent problems) in the input sensor circuits (open, short
circuits) are shorted, and the flashing of the rear defroster indicator light on the climate control unit indicates the
DTCs.
 If a diagnostic trouble code is indicated, refer to the following diagnostic trouble code table and inspect the
appropriate system. (Disconnections and short circuits are memorized in the same system even if either
occurs only once.)
 If the A/C switch is pressed again while in past failure indication mode, the on-board diagnostic function will
return to present failure indication mode.
Erasing Past Failure Memory
• When DTCs are displayed in the past failure
indication mode, they remain in the memory after
the failed systems are corrected. Consequently,
the next time the past failure indication mode is
used, the same past failure DTCs will be
indicated by the flashing of the rear defroster
indicator light on the climate control unit.
Therefore, erase the past failure memory after
correcting all failed systems. To erase the past
failure memory, press the AUTO switch and REC/
FRESH switch on the climate control unit at the
same time while in past failure indication mode. If
erased, the rear defroster indicator light flashes
once.
ON-BOARD DIAGNOSTIC
A6E8570W004
A6E8570W001