ON-BOARD DIAGNOSTIC FUNCTION

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Malfunction detection function

•  Detects errors in the input and output signals. (Switch the ignition to ON or the engine is running.)
•  If a malfunction is detected, a DTC is output to the DLC-2 through the malfunction display function. At the same time, malfunction detection results are sent to the fail-safe and memory functions.

Fail-safe function

•  If a malfunction is detected by the malfunction detection function and a malfunction is determined, the following controls are performed to prevent an operating malfunction of the full-auto air conditioner and malfunction of output parts.

Fail-safe Function Table

Part where malfunction is determined

Malfunction determined when IG SW at ON

Malfunction already exists when IG SW turned to ON
Cabin temperature sensor
Cabin temperature sensor input value is fixed at the value right before the malfunction.
Cabin temperature sensor input value is fixed at 25 °C {77 °F}.
Evaporator temperature sensor
A/C output OFF is controlled when the evaporator temperature sensor input value is at 0 °C {32 °F}.
←
Heater core temperature sensor
Heater core temperature sensor input value is fixed at 50 °C {122 °F}.
←
Solar radiation sensor
The solar radiation sensor input value is fixed at the value directly before the malfunction only when the valve is 1,450 W/m2 or more.
Note
•  The solar radiation sensor performs fail-safe control to the RH and LH independently.
Solar radiation sensor value is fixed at 0 W/m2.
Note
•  The solar radiation sensor performs fail-safe control to the RH and LH independently.
Engine coolant temperature sensor
Engine coolant temperature sensor input value is fixed at 95 °C {203 °F}.
←
Refrigerant pressure sensor
Refrigerant pressure sensor input value is fixed at 1.5 MPa {15 kgf/cm2, 218 psi}.
←
Air mix actuator
(potentiometer)
Air mix actuator drive signal is stopped right when the malfunction is determined.
However, it is fixed at MAX COLD when the manually set temperature is at 15 and fixed at MAX HOT when the manually set temperature is at 29.
Control based on ambient temperature.
(See Graph 1.)
However, it is fixed at MAX COLD when the manually set temperature is at 15 and fixed at MAX HOT when the manually set temperature is at 29.
Airflow mode actuator
(potentiometer)
Airflow mode actuator drive signal is stopped right when the malfunction is determined.
•  However, change the operation to VENT or DEF when the manual operation selected to VENT or DEF.
Control based on ambient temperature.
(See Graph 2.)
•  However, change the operation to VENT or DEF when the manual operation selected to VENT or DEF.
Air mix actuator
(motor lock)
Air mix actuator drive signal is stopped right when the malfunction is determined.
The climate control unit outputs air mix actuator drive voltage for 20 s. If the potentiometer does not reach the target voltage, a malfunction is determined and the motor is stopped.
Airflow mode actuator
(motor lock)
Airflow mode actuator drive signal is stopped right when the malfunction is determined.
The climate control unit outputs airflow mode actuator drive voltage for 9 s. If the potentiometer does not reach the target voltage, a malfunction is determined and the motor is stopped.
Water heater unit
Stops the water heater system operation.
←

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Memory Function

•  Stores the signal determined to be malfunctioning by the malfunction detection function, and the memory is not cleared, even if the ignition is switched off (LOCK) or the malfunction has been repaired.
•  Clear stored malfunction data by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.

Display Function

•  This function is for outputting present or past malfunctions via the DLC-2 as DTCs.
•  DTCs output via the DLC-2 can be read out using the Mazda Modular Diagnostic System (M-MDS).
Malfunction Display Mode
•  Present and past malfunctions in the control system circuits (open/short circuits) are detected, and the DTCs indicated in the table are displayed on the Mazda Modular Diagnostic System (M-MDS). Since once a past malfunction is stored, it will remain stored even after the malfunction has been repaired. Clear past malfunctions after completing repairs.
•  Clear stored past malfunctions by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.
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 store data using scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.
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DTC table (climate control system)

DTC

Malfunction location

Detected condition

Memory function
B1081:71
•  Driver-side air mix actuator (L.H.D.)
•  Passenger-side air mix actuator (R.H.D.)
Motor lock
X
B1082:71
•  Driver-side air mix actuator (R.H.D.)
•  Passenger-side air mix actuator (L.H.D.)
Motor lock
X
B1086:71
Airflow mode actuator
Motor lock
X
B1A61:11
Cabin temperature sensor
Circuit short to ground
X
B1A61:13
Circuit open
X
B1A63:12
Solar radiation sensor (RH)
Circuit shot to power supply
—
B1A63:13
Circuit open
—
B1A64:12
Solar radiation sensor (LH)
Circuit shot to power supply
—
B1A64:13
Circuit open
—
B1B71:11
Evaporator temperature sensor
Circuit short to ground
X
B1B71:13
Circuit open
X
B1C1A:11
•  Driver-side air mix actuator (potentiometer) (L.H.D.)
•  Passenger-side air mix actuator (potentiometer) (R.H.D.)
Circuit short to ground
X
B1C1A:13
Circuit open
X
B1C1B:11
•  Passenger-side air mix actuator (potentiometer) (L.H.D.)
•  Driver-side air mix actuator (potentiometer) (R.H.D.)
Circuit short to ground
X
B1C1B:13
Circuit open
X
B1C1C:11
Airflow mode actuator (potentiometer)
Circuit short to ground
X
B1C1C:13
Circuit open
X
B1D22:11
Heater core temperature sensor
Circuit short to ground
X
B1D22:13
Circuit open
X
P0530:12
Refrigerant pressure sensor
Circuit short to power supply
X
P0530:13
Circuit open
X
U0010:88
CAN communication system
Bus off
X
U0155:00
Lost communication with instrument cluster
No sub type information
X
U0166:00
Lost communication with water heater unit
No sub type information
X
U0156:00
Lost communication with information display
No sub type information
X
U0423:68
Invalid date received from Instrument cluster
Event information
X
U0425:68
Invalid date received from water heater unit
Event information
X
U3003:16
Climate control unit power supply voltage (B+)
Power supply voltage decreases (9.7 V or less)
X
U3003:17
Climate control unit power supply voltage (B+, IG2, TNS)
Power supply voltage increases (16.4 V or more (B+))
(16.8 V or more (IG2, TNS))
X

X  :Applicable
—  :Not applicable

DTC table (water heater system)

DTC

System malfunction location

Memory function
B1004
Glow plug malfunction: short to battery or transistor failure
X
B1005
Fuel pump (water heater system) malfunction: short to battery or transistor failure
X
B1006
Fuel level to low to start the heater
X
B1008
Blower fan malfunction: short to battery
X
B1317
Input voltage high
X
B1318
Input voltage low
X
B1342
Malfunction in water heater unit
X
B2207
Water heater unit ROM checksum error
X
B2449
Glow plug circuit short to ground
X
B2450
Glow plug circuit open
X
B2451
Fuel pump (water heater system) circuit short to ground
X
B2452
Fuel pump (water heater system) circuit open
X
B2453
Blower fan circuit short to ground
X
B2454
Blower fan circuit open
X
B2455
Blower fan out of range (electromotive force not present)
X
B2456
Coolant sensor short
X
B2457
Coolant sensor interrupted
X
B2458
Overheat sensor short
X
B2459
Overheat sensor interrupted
X
B2460
Flame sensor short
X
B2461
Flame sensor interrupted
X
B2462
•  Flame off from max. power
•  Flame off from min. power
X
B2463
Overheat
X
B2464
Start time exceeded
X
B2465
Start counter overrun/system locked
X
B2466
Overheat counter overrun/system locked
X
B2467
Water heater unit cool down time exceeded
X
U1900
CAN Communication Bus Fault - Receive Error
X
U2516
CAN bus off - Transmit Error
X

X  :Applicable

PID/data Monitor Function

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

PID/data monitor table (climate control system)

PID name (definition)

Input part

Unit/Condition
AC_PRES
Refrigerant pressure sensor
Pa
CABIN_TEMP
Cabin temperature sensor
°C
EVAP_TEMP
Evaporator temperature sensor
°C
HCT
Heater core temperature sensor
°C
SOLAR_SSR_L
Solar radiation sensor (LH)
W
SOLAR_SSR_R
Solar radiation sensor (RH)
W

PID/data monitor table (water heater system)

PID Name (Definition)

Condition/Specification (Reference)

Unit/Condition
CCNTFFH
(Continuous Codes)
•  DTC is detected: 1—255
•  DTC is not detected: 0
—
FAN
(Fan Control)
•  Blower fan is not operating: 0%
•  Blower fan is operating: 0-100%
On/Off
FUEL_PMP
(Fuel pump)
•  Fuel pump (water heater unit) is not operating: Off
•  Fuel pump (water heater unit) is operating: On
On/Off
GLOW
(Glow plug)
•  Glow plug is not operating: Off
•  Glow plug is operating: On
On/Off
HEATER
(Heater Status)
•  Water heater unit is not operating: Off
•  Water heater unit is operating: On
On/Off
PREFILL
(Water heater unit Lock/Unlock Status After Prefilling)
•  Water heater unit is not operating: Lock
•  Water heater unit is operating: Unlock
Lock/Unlock
VOLT_MDL
(Water heater unit Voltage)
•  Under any condition: B+
V


Active Command Modes Function

•  The simulation function is used for optionally selecting simulation items of output parts preset in the climate control unit/water heater unit, and to operate them regardless of the climate control unit/water heater unit.

Active command modes table (climate control system)

Command name

Output part

Operation

Operating condition
BLOWER
Blower Motor
On/Off
Switch the Ignition to ON
DISPLAY
Information display
MODE_ACT
Airflow mode actuator
MIX_ACT
Air mix actuator
REC/FRESH
REC switch

Active command modes table (water heater system)

Command name (Definition)

Operation

Condition/Specification (Reference)
FAN
(Fan Control)
On/Off
•  Blower fan is not operating: 0%
•  Blower fan is operating: 0-100%
FUEL_PMP
(Fuel pump)
On/Off
•  Fuel pump (water heater unit) is not operating: Off
•  Fuel pump (water heater unit) is operating: On
GLOW
(Glow plug)
On/Off
•  Glow plug is not operating: Off
•  Glow plug is operating: On
HEATER
(Heater Status)
On/Off
•  Water heater unit is not operating: Off
•  Water heater unit is operating: On


A/C Operation Check Mode

•  The climate control unit forces operation of output related moving parts as indicated in the operation check table, regardless of input related parts, while simultaneously changing the display on the information display, as well as illuminating each switch indicator light automatically. A malfunctioning part can be determined by verifying that each transition is as indicated in the operation check table through visual inspection, listening to the operation sound, or placing a hand on the air vent.

Mazda Modular Diagnostic System (M-MDS) display

Target part

Operation condition
Illumination of All Indicator lights
Climate control unit
All A/C indicator lights illuminated
Blower Motor Speed
Blower motor
Air Mix Actuator
Air mix door
Air Flow Mode Actuator
Airflow mode door
Air Intake Actuator / Air Conditioning Compressor
Air intake door
A/C compressor
FRESH Û REC
ON Û OFF

*  :Shown on the information display (at the set temperature display) according to each Mazda Modular Diagnostic System (M-MDS) display.