Mazda 6. Manual — part 387

U–52

CONTROL SYSTEM

FAN SWITCH INSPECTION

A6E854061050W01

1. Remove the climate control unit.
2. Inspect for continuity between the fan switch terminals using an ohmmeter.

• If not as specified, replace the fan switch.

End Of Sie

DEFROSTER SWITCH INSPECTION

A6E854061050W02

1. Remove the climate control unit.
2. Inspect for continuity between the defroster switch terminals using an ohmmeter.

• If not as specified, replace the climate control

unit.

End Of Sie

A6E8540W036

A6E8540W056

A6E8540W037

A6E8540W057

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

U–54

ON-BOARD DIAGNOSTIC

DTC Table

No.

Indicator pattern

Diagnosed circuit

02

Solar radiation sensor (present)

06

Cabin temperature sensor (present)

07

Cabin temperature sensor (past)

10

Evaporator temperature sensor (present)

11

Evaporator temperature sensor (past)

12

Ambient temperature sensor (present)

13

Ambient temperature sensor (past)

14

Water temperature sensor (present)

15

Water temperature sensor (past)

18

Air mix actuator [potentiometer] (present)

19

Air mix actuator [potentiometer] (past)

21

Airflow mode actuator [potentiometer] (present)

22

Airflow mode actuator [potentiometer] (past)

58

Air mix actuator [motor lock] (past)

59

Airflow mode actuator [motor lock] (past)

ON-BOARD DIAGNOSTIC

U–55

U

Output Device Operation Check Mode
Inspection

1. Warm up the engine.
2. Turn the ignition switch to LOCK position.
3. Start up the on-board diagnostic function (present failure indication mode).
4. Press the AUTO switch.
5. Verify that all the indicator lights of the climate

control unit and center panel (climate control part)
illuminate for 4 seconds.

6. Verify the operation of the each output device

when changing steps by pressing the REC/
FRESH switch, and referring to the output device
operation check chart.

• If not as specified, inspect the malfunctioning

system.

Note

• If the AUTO switch is pressed again, the on-

board diagnostic function will return to
present failure indication mode.

7. Turn the ignition switch to LOCK position to end

the on-board diagnostic function.

Output device operation check table

A6E8570W002

A6E8570W003

Step Operating device

Operating conditions

Moni

tor

*

Other device conditions

1

Blower motor
speed

1

• Air mix actuator operation

— 50%

• Airflow mode actuator operation

— VENT

• Air intake actuator operation

— FRESH

• A/C compressor operation

— ON

2

Air mix actuator
operation

21.0

• Blower motor speed

— 3rd

• Airflow mode actuator operation

— VENT

• Air intake actuator operation

— FRESH

• A/C compressor operation

— ON

20.5

20.0