The on-board diagnostic system has on-board diagnostic, PID/data monitor, and A/C operation check 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, PID/data monitor, and A/C operation check functions can be performed by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.
The malfunction detection function detects errors in the input and output signals. (Ignition switched ON or engine is running)
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.
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.
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.
Full-auto air conditionerX: Applicable—: Not applicableMalfunction 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 | Warning lamp | Malfunction location | Detected condition | Fail safe | Drive cycle | Self test type*1 | Memory function |
| B1081:71 | — | Driver-side air mix actuator | Motor lock | X | — | C | X |
| B1082:71 | — | Passenger-side air mix actuator | Motor lock | X | — | C | X |
| B1086:71 | — | Airflow mode actuator | Motor lock | X | — | C | X |
| B1A61:11 | — | Passenger compartment temperature sensor | Circuit short to ground | X | — | C, D | X |
| B1A61:13 | — | Circuit open | X | — | C, D | X |
|
| B1A63:12 | — | Solar radiation sensor (RH) | Circuit shot to power supply | X | — | C, D | X |
| B1A63:13 | — | Circuit open | X | — | D | X |
|
| B1A64:12 | — | Solar radiation sensor (LH) | Circuit shot to power supply | X | — | C, D | X |
| B1A64:13 | — | Circuit open | X | — | D | X |
|
| B1B71:11 | — | Evaporator temperature sensor | Circuit short to ground | X | — | C, D | X |
| B1B71:13 | — | Circuit open | X | — | C, D | X |
|
| B1C1A:11 | — | Driver-side air mix actuator (potentiometer) | Circuit short to ground | X | — | C, D | X |
| B1C1A:13 | — | Circuit open | X | — | C, D | X |
|
| B1C1B:11 | — | Passenger-side air mix actuator (potentiometer) | Circuit short to ground | X | — | C, D | X |
| B1C1B:13 | — | Circuit open | X | — | C, D | X |
|
| B1C1C:11 | — | Airflow mode actuator (potentiometer) | Circuit short to ground | X | — | C, D | X |
| B1C1C:13 | — | Circuit open | X | — | C, D | X |
|
| U0010:88 | — | CAN communication system | Bus off | X | — | C, D | X |
| U0155:00 | — | Lost communication with instrument cluster | No sub type information | X | — | C | X |
| U0423:68 | — | Invalid date received from Instrument cluster | Event information | X | — | C, D | X |
| U200D:11 | — | Climate control unit circuit voltage (+5V) | Circuit short to ground | — | — | C, D | X |
| U2300:54 | — | Configuration error | Data not received | X | — | C, D | X |
| U2300:55 | — | Not configured | X | — | C, D | — |
|
| U2300:56 | — | Ineffective/non-interchangeable data read | X | — | C, D | X |
|
| U2300:64 | — | Error value read | X | — | C, D | X |
|
| U3003:16 | — | Climate control unit power supply voltage | Power supply voltage decreases (9.98 V or less) | — | — | C, D | X |
| U3003:17 | — | Climate control unit power supply voltage | Power supply voltage increases (16.21 V or more) | — | — | C, D | X |
| U300E:13 | — | Climate control unit power supply circuit (IG1) | Circuit open | — | — | C, D | X |
| DTC | Warning lamp | Malfunction location | Detected condition | Fail safe | Drive cycle | Self test type*1 | Memory function |
| B1086:71 | — | Airflow mode actuator | Motor lock | X | — | C | X |
| B13AA:71 | — | Air mix actuator | Motor lock | X | — | C | X |
| B13AB:11 | — | Air mix actuator (potentiometer) | Circuit short to ground | X | — | C, D | X |
| B13AB:13 | — | Circuit open | X | — | C, D | X |
|
| B1B71:11 | — | Evaporator temperature sensor | Circuit short to ground | X | — | C, D | X |
| B1B71:13 | — | Circuit open | X | — | C, D | X |
|
| B1C1C:11 | — | Airflow mode actuator (potentiometer) | Circuit short to ground | X | — | C, D | X |
| B1C1C:13 | — | Circuit open | X | — | C, D | X |
|
| U0010:88 | — | CAN communication system | Bus off | X | — | C, D | X |
| U0155:00 | — | Lost communication with instrument cluster | No sub type information | X | — | C | X |
| U0423:68 | — | Invalid date received from Instrument cluster | Event information | X | — | C, D | X |
| U200D:11 | — | Climate control unit circuit voltage (+5V) | Circuit short to ground | — | — | C, D | X |
| U2300:54 | — | Configuration error | Data not received | X | — | C, D | X |
| U2300:55 | — | Not configured | X | — | C, D | — |
|
| U2300:56 | — | Ineffective/non-interchangeable data read | X | — | C, D | X |
|
| U2300:64 | — | Error value read | X | — | C, D | X |
|
| U3003:16 | — | Climate control unit power supply voltage | Power supply voltage decreases (9.98 V or less) | — | — | C, D | X |
| U3003:17 | — | Climate control unit power supply voltage | Power supply voltage increases (16.21 V or more) | — | — | C, D | X |
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.
Status byte for DTC
The status byte is the two digits (after hyphen) after the 7-digit DTC.
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.
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 name (definition) | Unit/Condition | Operation Status (Reference) | Input part |
| A/C_SW | Off/On |
| Climate control unit |
| AUTO_SW | Off/On |
| Climate control unit |
| B_MT_RLY_CS | Off/On |
| Climate control unit |
| DEF_SW | Off/On |
| Climate control unit |
| DUAL_SW | Off/On |
| Climate control unit |
| ENG_C_TMP | °C, °F | Engine coolant temperature is displayed | Engine coolant temperature sensor |
| EVA_TMP_SEN | °C, °F | Evaporator temperature is displayed | Evaporator temperature sensor |
| F_REC_CS | Off/On |
| Climate control unit |
| FRE_SW | Off/On |
| Climate control unit |
| INC_TMP_SEN | °C, °F | Cabin temperature is displayed | Passenger compartment temperature sensor |
| M_DOWN_SW | Off/On |
| Climate control unit |
| M_UP_SW | Off/On |
| Climate control unit |
| OFF_SW | Off/On |
| Climate control unit |
| OUT_CAR_TMP | °C, °F | Ambient temperature is displayed | Ambient temperature sensor |
| R/DEF_CS | Off/On |
| Climate control unit |
| R/DEF_SW | Off/On |
| Climate control unit |
| REC_SW | Off/On |
| Climate control unit |
| S_HT_CUT_CS | No_Request/Cut |
| Climate control unit |
| SLR_R_SEN_L | W | Solar radiation amount is displayed | Solar radiation sensor |
| SLR_R_SEN_R |
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| UNIT_TMP | deg_C/deg_F |
| Climate control unit |
| PID name (definition) | Unit/Condition | Operation Status (Reference) | Input part |
| A/C_SW | Off/On |
| Climate control unit |
| B_MT_RLY_CS | Off/On |
| Climate control unit |
| ENG_C_TMP | °C, °F | Engine coolant temperature is displayed | Engine coolant temperature sensor |
| EVA_TMP_SEN | °C, °F | Evaporator temperature is displayed | Evaporator temperature sensor |
| F_REC_CS | Off/On |
| Climate control unit |
| FRE_SW | Off/On |
| Climate control unit |
| MODE_DIAL | Unknown / VENT / VENT-B/L / B/L / B/L-HEAT / HEAT / HEAT-H/D / H/D / H/D-DEF / DEF | Mode dial status | Climate control unit |
| OUT_CAR_TMP | °C, °F | Ambient temperature is displayed | Ambient temperature sensor |
| R/DEF_CS | Off/On |
| Climate control unit |
| R/DEF_SW | Off/On |
| Climate control unit |
| REC_SW | Off/On |
| Climate control unit |
| TEMP_DIAL | — | Temperature setting status | Climate control unit |
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.) |
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| 1 | 0 % | VENT | 3rd | ON | FRESH |
| 2 | 50 % |
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| 3 | 100 % |
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| 4 | 50 % |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| 1 | 20.0 {68} |
|
| Displayed | Illuminated | Not illuminated | Illuminated |
| 2 | 20.5 {68.9} |
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| 3 | 21.0 {70} |
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| 4 | 20.5 {68.9} |
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.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| 1 | 0 % | VENT | 5th | ON | FRESH |
| 2 | OFF |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| 1 | 8 {46} |
|
| Displayed | Illuminated | Not illuminated | Illuminated |
| 2 | Not displayed | Not illuminated |
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.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| 1 | 0 % | VENT | 3rd | ON | FRESH |
| 2 | RECIRCULATE |
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| 3 | OFF | FRESH |
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| 4 | RECIRCULATE |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| 1 | 4 {39} |
|
| Displayed | Illuminated | Not illuminated | Illuminated |
| 2 | Illuminated | Not illuminated |
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| 3 | Not displayed | Not illuminated | Not illuminated | Illuminated |
|||
| 4 | Illuminated | Not illuminated |
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.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| 1 | 50 % | VENT | OFF | OFF | FRESH |
| 2 | 1st | ON |
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| 3 | 3rd |
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| 4 | 5th |
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| 5 | 7th |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| 1 | 1 {34} |
| Not displayed | Not displayed | Not illuminated | Not illuminated | Illuminated |
| 2 |
| Displayed | Illuminated |
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| 3 |
|
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| 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.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| 1 | 50 % | VENT | 3rd | ON | FRESH |
| 2 | BI-LEVEL |
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| 3 | HEAT |
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| 4 | DEF/HEAT |
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| 5 | DEFROSTER |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| 1 | 3 {37} |
|
| Displayed | Illuminated | Not illuminated | Illuminated |
| 2 |
|
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| 3 |
|
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| 4 |
|
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| 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.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| — | 50 % | VENT | OFF | OFF | FRESH |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| — | All indicator displayed | Illuminated | Illuminated | Illuminated |
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NOTE:
Operation
If "Stop" is selected while the A/C operation check is operating, the A/C stops at the conditions shown in the table.
| Step | Air mix actuator | Airflow mode actuator | Blower speed | Magnet clutch | Air intake actuator |
| — | 50 % | VENT | OFF | OFF | FRESH |
| Step | Temperature (°C {°F}) | Airflow mode | Blower volume | A/C | A/C switch indicator light | Recirculate switch indicator light | Fresh switch indicator light |
| — | 0 {32} |
| Not displayed | Not displayed | Not illuminated | Not illuminated | Illuminated |
