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

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Outline

• The on-board diagnostic system has on-board diagnostic and PID/data monitor functions.

• The on-board diagnostic function has the following functions:

― Malfunction detection function

• Detects errors in input and output signals

― Memory function

• Stores detected malfunctions

― Malfunction indication function

• Displays detected malfunctions

• The malfunction indication function and PID/data monitor function can be performed by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.

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.

DTC table

X: Applicable

—: Not applicable

DTC No.	Warning/indicator light	System malfunction location	Fail-safe function	Drive cycle	Self test type^*1	Memory function
B10FB:71^*2	—	Air intake actuator motor lock	X	—	C	X
B11F0:12^*2	—	Air intake actuator (potentiometer) circuit short to power supply	X	—	C, D	X
B11F0:13^*2	—	Air intake actuator (potentiometer) circuit open	X	—	C, D	X
B11F5:86^*2	—	Invalid data (humidity sensor temperature) received from humidity sensor	X	—	C, D	X
B1A69:86^*2	—	Invalid data (relative humidity) received from humidity sensor	X	—	C, D	X
B1B71:11	—	Evaporator temperature sensor circuit short to ground	X	—	C, D	X
B1B71:13	—	Evaporator temperature sensor circuit open	X	—	C, D	X
U0010:88	—	Unit communication error (MS-CAN)	—	—	C	X
U0155:00	—	Communication error with instrument cluster	X	—	C, D	X
U0423:68	—	Invalid date received from Instrument cluster	X	—	C, D	X
U200D:11	—	Climate control unit circuit voltage (+5V) circuit short to ground	—	—	C, D	X
U210A:86^*2	—	Invalid data (windshield temperature) received from humidity sensor	X	—	C, D	X
U2300:54	—	Configuration error (data not received)	X	—	C, D	X
U2300:55	—	Configuration error (not configured)	X	—	C, D	—
U2300:56	—	Configuration error (ineffective/non-interchangeable data read)	X	—	C, D	X
U2300:64	—	Configuration error (error value read)	X	—	C, D	X
U3003:16	—	Climate control unit power supply circuit voltage below threshold (10.00 V or less)	—	—	C, D	X
U3003:17	—	Climate control unit power supply circuit voltage above threshold (17.30 V or more)	—	—	C, D	X
U300E:13	—	Climate control unit power supply circuit open (IG1)	—	—	C, D	X

*1 :C: CMDTC self test, D: ODDTC self test

*2 :With humidity sensor

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

ac5wzn00001326

• 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

PID	Unit/Condition	Data contents	Climate control unit terminal
A/C_SW	Off/On	• Off: A/C switch is off. • On: A/C switch is on.	—
B_MT_RLY_CS	Off/On	• Off: Blower relay is off. • On: Blower relay is on.	—
ELE_W/P	Note • Displays in the M-MDS but it does not operate.
ENG_C_TMP	°C, °F	Engine coolant temperature is displayed.	—
EVA_TMP_SEN	°C, °F	Evaporator temperature is displayed.	G, J
F_REC_CS	Off/On	• Off: Forced recirculate control is off. • On: Forced recirculate control is on.	—
F_WIND_TEMP	°C, °F	Windshield temperature is displayed.	—
HUMIDITY_SEN	%	Relative humidity is displayed.	—
OUT_CAR_TMP	°C, °F	Ambient temperature is displayed.	—
R/DEF_CS	Off (enable)/ Off (suspend)/ Off (inhibit)/ On	• Off (enable): Rear window defogger is off (operation enabled). • Off (suspend): Rear window defogger is off (operation interrupted / indicator is kept On). • Off (inhibit): Rear window defogger is off (operation disabled / indicator is turned Off). • On: Rear window defogger is on.	—
R/DEF_SW	Off/On	• Off: Rear window defogger switch is off. • On: Rear window defogger switch is on.	—
REC_SW	Off/On	• Off: RECIRCULATE switch is off. • On: RECIRCULATE switch is on.	—
RLS_TEMP	°C, °F	Humidity sensor temperature is displayed.	—
STOP_ST	Available/ Not Available/ Error	• i-stop permit condition: Available • i-stop inhibit condition: Not Available • i-stop signal failure: Error	—