Control System (HVAC): Diagnosis Mazda 3 BK рестайлинг

AIR MIX ACTUATOR INSPECTION

Scheme 20

Scheme 21

1. Connect battery positive voltage to air mix actuator terminal D (or F), connect terminal F (or D) to ground, and then verify that the air mix actuator operates as shown in the table. If the operation condition is not normal, replace the air mix actuator. AIR MIX ACTUATOR TERMINALS REFERENCE Terminal Air mix actuator operation D F B+ Ground HOT --> COLD Ground B+ COLD --> HOT
2. Verify that the resistance between terminals B and C, C and A matches the air mix actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the air mix actuator.

Scheme 22

1. Disconnect the negative battery cable.
2. Remove the airflow mode rod from the airflow mode actuator.
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

AIRFLOW MODE ACTUATOR INSPECTION

Scheme 23

Scheme 24

1. Connect battery positive voltage to airflow mode actuator terminal D (or F), connect terminal F (or D) to ground, and then verify that the airflow mode actuator operates as shown in the table. If the operation condition is not normal, replace the airflow mode actuator. AIRFLOW MODE ACTUATOR TERMINALS REFERENCE Terminal Airflow mode actuator operation D F B+ Ground VENT --> DEFROSTER Ground B+ DEFROSTER --> VENT
2. Verify that the resistance between terminals A and C, C and B matches the airflow mode actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the airflow mode actuator.

BLOWER MOTOR INSPECTION

Connect battery positive voltage to blower motor terminal A, connect terminal B to ground, and then verify its operation.

Scheme 25

1. If there is any malfunction, replace the blower motor.

Scheme 26

1. Disconnect the negative battery cable.
2. Remove the PJB and PJB bracket. (See «PASSENGER JUNCTION BOX (PJB) REMOVAL/INSTALLATION»(ref-274501-S23137470742007121800000) .)
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 27

1. Verify that the continuity between the power MOS FET terminals is as indicated in the table. If there is any malfunction, replace the power MOS FET. If the blower motor operation is not normal even though no malfunction can be verified, inspect the climate control unit. (See «CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]»(ref-274444-S29074411662007121800000) ). TERMINALS RESISTANCE CHART Tester lead Resistance (kilohm) + - A B infinity A C 6.9 B A Continuity detected B C Continuity detected C A 6.9 C B infinity

Scheme 28

Scheme 29

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [LF, L3]»(ref-274420-S29522485672007121800000) .)
2. Disconnect the negative battery cable.
3. Remove the following parts: Side wall (See «SIDE WALL REMOVAL/INSTALLATION»(ref-274485-S19319522972007121800000) .) Accelerator pedal
4. Disconnect the blower motor cooling pipe connected to the blower motor.
5. Disconnect the resistor connector.
6. Remove the resistor.
7. Affix the gummed tape to the thread hole area as shown in the figure. (Do not wrap the packing tape around the backside of the resistor.)
8. Stick the screw into the thread hole.
9. Set the resistor to the A/C unit and temporarily tighten the hexagon head screw. CAUTION: While setting the resistor, be careful not to damage the pattern surface. Otherwise it could cause a resistor operation malfunction.
10. Tighten the lower screw.
11. Tighten the hexagon head screw.
12. Connect the resistor connector.
13. Connect the blower motor cooling pipe.
14. Install the following parts: Accelerator pedal Side wall (See «SIDE WALL REMOVAL/INSTALLATION»(ref-274485-S19319522972007121800000) .)
15. Connect the negative battery cable.
16. Install the battery cover.

Scheme 30

1. Verify that the resistance between the resistor terminals is as shown in the table. If there is any malfunction, replace the resistor. TERMINALS RESISTANCE CHART Terminal Resistance (ohm) A-D 0.27-0.30 A-B 1.30-1.49 A-C 2.10-2.40

Scheme 31

1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly.
3. Adjust the magnetic clutch clearance. (See «MAGNETIC CLUTCH ADJUSTMENT»(ref-274444-S26590602692007121800000) ).

Scheme 32

1. When removing or installing the bolt, hold the pressure plate in place as shown in the figure.
2. When installing a new A/C compressor body, replace the recommended bolt.

EVAPORATOR TEMPERATURE SENSOR INSPECTION

Note. Inspect the evaporator temperature sensor when it is installed to the A/C unit.

Scheme 33

1. Set the fan speed MAX HI.
2. Set the temperature control at MAX COLD.
3. Set the RECIRCULATE mode.
4. Turn the A/C switch off.
5. Close all doors and windows.
6. Wait for 5 min.
7. Disconnect the evaporator temperature sensor connector.
8. Measure the temperature at the blower inlet.
9. Measure the resistance between the evaporator temperature sensor terminals. If the resistance is not as shown in the graph, replace the evaporator temperature sensor.

Scheme 34

Scheme 35

1. Disconnect the negative battery cable.
2. Discharge the refrigerant from the system. (See «REFRIGERANT CHARGING»(ref-274442-S02883189572007121800000) .)
3. Remove the P/S fluid reserve tank. (L3 with TC)
4. Remove the coolant reserve tank. (L3 with TC)
5. Loosen the refrigerant pressure switch using two spanners.
6. Remove in the order indicated in the table. LF, L3 L3 with TC
7. Install in the reverse order of removal.

CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

1. Turn the ignition switch to the ON position.
2. Connect the negative (-) lead of the tester to body ground.
3. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table. If there is any malfunction, inspect the parts under "Inspection item (s)". If the parts under "Inspection item (s)" are found to be normal (except for terminal F), replace the climate control unit. For terminal F, first try replacing the power MOS FET. If there is still any malfunction, replace the climate control unit.

Scheme 36

CLIMATE CONTROL UNIT CONNECTOR TERMINAL VOLTAGE CHART

Scheme 37

CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]

1. Install the PJB.
2. Turn the ignition switch to the ON position.
3. Connect the negative (-) lead of the tester to body ground.
4. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table. If there is any malfunction, inspect the parts under "Inspection item (s)". If the parts under "Inspection item (s)" are found to be normal, replace the climate control unit.

Scheme 38

CLIMATE CONTROL UNIT CONNECTOR TERMINAL REFERENCE

Scheme 39

Scheme 40

Scheme 41

1. Remove the climate control unit.
2. Verify that the continuity between the fan switch terminals is as indicated in the table. If there is any malfunction, replace the fan switch.