ON-BOARD DIAGNOSTIC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

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Outline

―  Malfunction detection function

•  Detects errors in input and output signals

―  Memory function

•  Stores detected malfunctions

―  Malfunction indication function

•  Displays detected malfunctions

Block Diagram

am6xun00001433

Function

Malfunction detection function

•  The malfunction detection function detects errors in the input and output signals. (Ignition is switched ON (engine off or on))

•  If a malfunction is detected, a DTC is output to the DLC-2 through the malfunction indication function.

•  At the same time, malfunction detection results are sent to the fail-safe and memory functions.

Memory function

•  The memory function stores malfunctioning signal systems which are detected to be malfunctioning by the malfunction detection function.

•  The stored malfunction information is not cleared even when the ignition is switched off (LOCK) or the malfunction is repaired.

•  The stored malfunction information can be cleared by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2 and operating it.

Malfunction indication function

•  The malfunction indication function outputs present or past malfunctions to the DLC-2 as DTCs.

•  The DTCs can be read by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2 and operating it.

Malfunction display mode

•  The climate control unit detects present and past malfunctions in the control system circuits (open/short circuits) and indicates the DTCs shown in the table on the Mazda Modular Diagnostic System (M-MDS).

•  Clear past malfunctions after completing repairs because once a past malfunction is stored, it will remain stored even after the malfunction has been repaired.

•  The stored past malfunction can be cleared by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2 and operating it.

DTC table

DTC 7-digit code definition

•  When related systems or components have failed, the CM stores the DTC of the malfunctioning part in the CM memory, and allows for the retrieval of the stored data using the scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.

ac5wzn00001320

Status byte for DTC

•  The status byte is the two digits (after hyphen) after the 7-digit DTC.

ac5wzn00001326

•  The status byte is a code which indicates the pending code, current/past malfunction status, or warning illumination status.

•  The status byte can be read by performing a CMDTC self-test using the Mazda Modular Diagnostic System (M-MDS).

•  For details on the status byte, refer to the explanation on the Mazda Modular Diagnostic System (M-MDS) when reading the DTC.

PID/data monitor

•  The PID/data monitor function is used for optionally selecting input signal monitor items preset in the climate control unit and reading them out in real-time.

PID/data monitor table

With DUAL switch

With SYNC switch

A/C operation check mode

•  The A/C operation check mode forcibly operates the output devices as shown in the operation check table regardless of the signals input to the climate control unit.

•  During an A/C operation check mode operation, indication in the display panel and the illumination of the indicator light on the switches are automatically controlled.

•  Determine the malfunctioning part by visual inspection, listening to the operation sound, placing a hand on the air vents, or checking that each transition is as indicated in the operation check table.

Mazda Modular Diagnostic System (M-MDS) display	Target part	Reference
Air Mix Actuator	•  Air mix actuator •  Air mix door	(See Air mix actuator)
Air conditioning compressor	•  A/C compressor	(See A/C compressor)
Air Intake Actuator	•  Air intake actuator •  Air intake door	(See Air intake actuator)
Blower Motor Speed	•  Blower motor	(See Blower motor)
Airflow Mode Actuator	•  Airflow mode actuator •  Airflow mode door	(See Airflow mode actuator)
Illumination Of All Indicator Lights	•  Climate control unit	(See Indicator light)

Air mix actuator

Operation

Display

Step	Front climate control unit						Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	20.0 {68}			Displayed	Not illuminated	Not illuminated	20.0 {68}			Not illuminated	Not illuminated
2	21.0 {70}						21.0 {70}

Note

•  After approx. 22 s have elapsed, the operation step moves to the next step.

•  When the last step is finished, the operation is repeated from Step 1.

•  To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

A/C compressor

Operation

Display

Step	Front climate control unit						Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	4 {39.2}			Displayed	Not illuminated	Not illuminated	Not illuminated
2				Not displayed

Note

•  After the following times have elapsed, the operation step moves to the next step.

―  Step 1: Approx. 5 s

―  Step 2: Approx. 25 s

•  When the last step is finished, the operation is repeated from Step 1.

Air intake actuator

Operation

Display

Step	Front climate control unit						Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	4 {39}			Displayed	Not illuminated	Not illuminated	Not illuminated
2					Illuminated
3
4
5
6				Not displayed	Not illuminated
7					Illuminated
8
9

Note

•  After approx. 2 s have elapsed, the operation step moves to the next step.

•  When the last step is finished, the operation is repeated from Step 1.

•  To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Blower motor

Operation

Display

Front climate control unit							Rear climate control unit
Step	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	1 {34}		Not displayed	Not displayed	Not illuminated	Not illuminated	1 {34}		Not displayed	Not displayed	Not displayed
2				Displayed
3
4
5

Note

•  After approx. 4 s have elapsed, the operation step moves to the next step.

•  When the last step is finished, the operation is repeated from Step 1.

•  To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Airflow mode actuator

Operation

Display

Step	Front climate control unit						Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	3 {37}			Displayed	Not illuminated	Not illuminated	Not illuminated			Not displayed	Not displayed
2
3
4
5

Note

•  After approx. 11 s have elapsed, the operation step moves to the next step.

•  When the last step is finished, the operation is repeated from Step 1.

•  To prevent super-cooling, the magnetic clutch turns off despite the A/C forced override.

Indicator light

Operation

Display

A/C operation check stop

Note

•  If "Stop" is selected while the A/C operation check is operating, the A/C stops at the conditions shown in the table.

Operation

Display

Step	Front climate control unit						Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Other indicator light	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
—	0 {32}		Not displayed	Not displayed	Not illuminated	Not illuminated	Not displayed