ON-BOARD DIAGNOSTIC [CLIMATE CONTROL UNIT]

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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

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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 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.

Note

•  There are two types of front climate control unit, type A and type B.

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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.

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Status byte for DTC

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

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•  A code which indicates the pending code, current/past malfunction status, or warning illumination status.

•  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

A/C Operation Check Mode

Note

•  There are two types of front climate control unit, type A and type B.

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M-MDS display	Target part	Reference
Air Mix Actuator	•  Front air Mix Actuator •  Front air mix door	(See Front 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	•  Front blower motor	(See Front blower motor)
Airflow Mode Actuator	•  Front airflow mode actuator •  Front airflow mode door	(See Front airflow mode actuator)
Illumination Of All Indicator Lights	•  Climate control unit	(See Indicator light)

Note

•  “Electrical Water Pump”, “Rear Vent Actuator” and “Rear Blower Motor Speed” are displayed in the M-MDS but they do not operate.

Front air mix actuator

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Air Mix Actuator” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

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

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Air conditioning compressor” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

Step	Front climate control unit							Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Power switch indicator light*2	Other indicator lights	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	4 {39}*1 8 {46}*2			Displayed	Not illuminated	Illuminated	Not illuminated	Not displayed
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

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Air Intake Actuator” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

Step	Front climate control unit							Rear climate control unit
	Temperature (°C {°F})	Airflow mode	Blower volume	A/C	Recirculate switch indicator light	Power switch indicator light*1	Other indicator lights	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
1	4 {39}			Displayed	Not illuminated	Illuminated	Not illuminated	Not displayed
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.

Front blower motor

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Blower Motor Speed” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

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

Front airflow mode actuator

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Airflow Mode Actuator” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

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

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  After the vehicle is identified, select the following items from the initial screen of the M-MDS.

(1)  Select the “Body”.

(2)  Select the “EATC Operation Check”.

4.  Select the “Illumination Of All Indicator Lights” from the screen menu.

5.  Verify the A/C operation check mode according to the directions on the screen.

6.  Select “Stop” to stop the A/C operation check. (See A/C operation check stop.)

Operation

Display

A/C operation check stop

1.  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	Power switch indicator light*1	Other indicator lights	Temperature (°C {°F})	Airflow mode	Blower volume	AUTO	SYNC
—	0 {32}		Not displayed	Not displayed	Not illuminated	Not illuminated	Not illuminated	Not displayed