Control System (HVAC): Diagnosis Mazda CX-7 I

AIRFLOW MODE ACTUATOR INSPECTION

Scheme 62

Scheme 63

Scheme 64

1. Connect battery positive voltage to terminal D or F and ground to terminal F or D of the airflow mode actuator.
2. Verify that the airflow mode actuator operates as shown below. If there is any malfunction, replace the airflow mode actuator. CONNECTION MOVEMENT REFERENCE Connection Movement B+ GND D F DEFROSTER --> VENT F D VENT --> DEFROSTER
3. Verify that the resistance between the terminals of the airflow mode actuator is as shown in the graph. If there is any malfunction, replace the airflow mode actuator.

CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

1. Remove the climate control unit. (See «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER]»(ref-269019-S13274020272007102700000) .)
2. Install the audio unit. (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ).
3. Connect the climate control unit connector.
4. Connect the negative (-) lead of the tester to body ground.
5. Turn the ignition switch to the ON position.
6. 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 T), replace the climate control unit. For terminal T, first try replacing the power MOS FET. If there is still any malfunction, replace the climate control unit.

Scheme 65

TERMINAL VOLTAGE REFERENCE

Scheme 66

CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]

1. Remove the climate control unit. (See «CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER]»(ref-269019-S13292264222007102700000) .)
2. Disconnect the air mix wire from the climate control unit
3. Install the audio unit. (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ).
4. Connect the climate control unit connector.
5. Connect the negative (-) lead of the tester to body ground.
6. Turn the ignition switch to the ON position.
7. 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 67

TERMINAL VOLTAGE REFERENCE

Scheme 68

Scheme 69

Scheme 70

Scheme 71

1. Disconnect the negative battery cable.
2. Remove the following parts: Console panel (See «CONSOLE PANEL REMOVAL/INSTALLATION»(ref-269050-S29358925182007102700000) ). Console (See «CONSOLE REMOVAL/INSTALLATION»(ref-269050-S01041673842007102700000) ). Front scuff plate inner (See «FRONT SCUFF PLATE REMOVAL/INSTALLATION»(ref-269050-S34251263902007102700000) ). Front side trim (See «FRONT SIDE TRIM REMOVAL/INSTALLATION»(ref-269050-S13516748582007102700000) ). Dashboard under cover Glove compartment (See «GLOVE COMPARTMENT REMOVAL/INSTALLATION»(ref-269050-S11046456102007102700000) ). Hood release lever (See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION»(ref-269047-S41720534972007102700000) ). Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-269050-S05344216152007102700000) ). Center panel (See «CENTER PANEL REMOVAL/INSTALLATION»(ref-269050-S19487269542007102700000) ). Audio unit (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ). Climate control unit (See «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER]»(ref-269019-S13274020272007102700000) .) (See «CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR CONDITIONER]»(ref-269019-S13292264222007102700000) .) (See «CLIMATE CONTROL UNIT INSTALLATION [MANUAL AIR CONDITIONER]»(ref-269019-S28439687732007102700000) .) Knee bolster (See «KNEE BOLSTER REMOVAL/INSTALLATION»(ref-269050-S20061919862007102700000) ). Meter hood (See «METER HOOD REMOVAL/INSTALLATION»(ref-269050-S37165522602007102700000) ). Column cover (See «COLUMN COVER REMOVAL/INSTALLATION»(ref-269050-S25734514712007102700000) ). Instrument cluster (See «INSTRUMENT CLUSTER REMOVAL/INSTALLATION»(ref-269055-S06211693682007102700000) ). Driver-side air bag module (See «DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION»(ref-269024-S06836863402007102700000) ). Steering wheel (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION»(ref-269012-S00459439552007102700000) ). Combination switch (See «COMBINATION SWITCH REMOVAL/INSTALLATION»(ref-269051-S39570818122007102700000) ). Steering shaft (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION»(ref-269012-S00459439552007102700000) ). A-pillar lower trim (See «A-PILLAR LOWER TRIM REMOVAL/INSTALLATION»(ref-269050-S26657353762007102700000) ). A-pillar trim (See «A-PILLAR TRIM REMOVAL/INSTALLATION»(ref-269050-S28084858322007102700000) ). Dashboard (See «DASHBOARD REMOVAL/INSTALLATION»(ref-269050-S21272771312007102700000) ).
3. Remove the blower motor. (See «BLOWER MOTOR REMOVAL/INSTALLATION»(ref-269019-S41961936212007102700000) .)
4. Remove the power MOS FET (Full-auto air conditioner) or resistor. (Manual air conditioner) (See «POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR (POWER MOS FET»(ref-269019-S01200935752007102700000) ) REMOVAL/INSTALLATION.) (See «RESISTOR REMOVAL/INSTALLATION»(ref-269019-S42143967682007102700000) .)
5. Remove the blower unit installation nuts.
6. Remove the screw securing the duct (2) to the A/C unit, by inserting a phillips screwdriver into the hole made after removing the blower motor.
7. Remove the screw securing the duct (2) to the A/C unit.
8. Remove the duct (2).
9. Remove in the order indicated in the table.
10. Install in the duct (2).
11. Install the two outer screws, securing the duct (2) to the A/C unit.
12. Install the screw on the end of the phillips screwdriver with the packing tape. CAUTION: If the packing tape remains in the duct (2), it may become a source of noise. Wind up the packing tape to prevent pinching when tightening the screw.
13. Install the duct (2) to the A/C unit by inserting a phillips screwdriver, with the screw, into the hole made after removing the blower motor.
14. Pull out the Phillips screwdriver together with the packing tape.
15. Install in the reverse order of removal.

AIR MIX ACTUATOR INSPECTION

Scheme 72

Scheme 73

Scheme 74

1. Connect battery positive voltage to terminal D or F and ground to terminal F or D of the air mix actuator.
2. Verify that the air mix actuator operates as shown below. If there is any malfunction, replace the air mix actuator. CONNECTION MOVEMENT REFERENCE Connection Movement B+ GND D F HOT --> COLD F D COLD --> HOT
3. Verify that the resistance between the terminals of the air mix actuator are as shown in the graph. If there is any malfunction, replace the air mix actuator.

Scheme 75

1. Disconnect the negative battery cable.
2. Discharge the refrigerant from the system. (See «REFRIGERANT RECOVERY»(ref-269017-S00065438922007102700000) .) (See «REFRIGERANT CHARGING»(ref-269017-S34224364942007102700000) ).
3. Loosen the refrigerant pressure switch using two spanners.
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.
6. Perform the refrigerant system performance test. (See «REFRIGERANT SYSTEM PERFORMANCE TEST»(ref-269017-S19050498962007102700000) ).

AMBIENT TEMPERATURE SENSOR INSPECTION

Note. Ambient temperature sensor does not detect a sudden change in temperature sensitively caused by driving or stopping the vehicle to stabilize the control of the full-auto air conditioner. Therefore, the measured value may differ from the original value when the resistance of the ambient temperature sensor is measured immediately after the removal.

Scheme 76

1. After removing the ambient temperature sensor, leave it to the inspection place for 30 min or more.
2. Measure the temperature around the ambient temperature sensor.
3. Measure the resistance between terminals of the ambient temperature sensor. If the resistance is not as shown in the graph, replace the ambient temperature sensor.

Scheme 77

1. Disconnect the negative battery cable.
2. Remove the following parts: Console (See «CONSOLE REMOVAL/INSTALLATION»(ref-269050-S01041673842007102700000) ). Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-269050-S05344216152007102700000) ). Center panel (See «CENTER PANEL REMOVAL/INSTALLATION»(ref-269050-S19487269542007102700000) ). Audio unit (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ).
3. Remove the screws and climate control unit.
4. Release the tab and pull the climate control unit toward you.
5. Disconnect the climate control unit connectors and remove the climate control unit.
6. Install in the reverse order of removal.

Scheme 78

Scheme 79

1. Disconnect the negative battery cable.
2. Remove the following parts: Glove compartment. (See «GLOVE COMPARTMENT REMOVAL/INSTALLATION»(ref-269050-S11046456102007102700000) ). Console (See «CONSOLE REMOVAL/INSTALLATION»(ref-269050-S01041673842007102700000) ). Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-269050-S05344216152007102700000) ). Center panel (See «CENTER PANEL REMOVAL/INSTALLATION»(ref-269050-S19487269542007102700000) ). Audio unit (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ).
3. Disconnect the air mix wire from wire clamp and link.
4. Remove the screws and climate control unit.
5. Release the tab and pull the climate control unit toward you.
6. Disconnect the climate control unit connectors and remove the climate control unit.

Scheme 80

1. Pass air mix wire through the following routes then connect to A/C unit. (Manual air conditioner)
2. Install the following parts: Climate control unit to the dashboard. Audio unit (See «AUDIO UNIT REMOVAL/INSTALLATION»(ref-269053-S11995302372007102700000) ). Center panel (See «CENTER PANEL REMOVAL/INSTALLATION»(ref-269050-S19487269542007102700000) ). Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-269050-S05344216152007102700000) ). Console (See «CONSOLE REMOVAL/INSTALLATION»(ref-269050-S01041673842007102700000) ).
3. Adjust the air mix wire. (See «CLIMATE CONTROL UNIT WIRE ADJUSTMENT»(ref-269019-S12731965722007102700000) .)
4. Install the globe compartment.

Scheme 81

Scheme 82

1. Remove the climate control unit.
2. Inspect for continuity between the airflow volume control dial terminals using an ohmmeter. If not as specified, replace the airflow volume control dial.