Control System (HVAC): Diagnosis Mazda 5 I

AIR MIX ACTUATOR INSPECTION

Scheme 52

Scheme 53

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 OPERATION CONDITION 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 54

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3]»(ref-244326-S41790335602006092100000) ).
2. Disconnect the negative battery cable.
3. Remove the following parts: Column cover (See «COLUMN COVER REMOVAL/INSTALLATION»(ref-244361-S33738517862006092100000) ). Front heat duct (LH)
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.

AIRFLOW MODE ACTUATOR INSPECTION

Scheme 55

Scheme 56

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 OPERATION CONDITIONS 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 57

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

Scheme 58

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3]»(ref-244326-S41790335602006092100000) ).
2. Disconnect the negative battery cable.
3. Remove the side wall. (See «SIDE WALL REMOVAL/INSTALLATION»(ref-244361-S31703119622006092100000) ).
4. Remove the under cover.
5. Remove in the order indicated in the table.
6. Install in the reverse order of removal.

Scheme 59

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-244390-S14795132712006092100000) ). POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR CONTINUITY REFERENCE 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 60

Scheme 61

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3]»(ref-244326-S41790335602006092100000) ).
2. Disconnect the negative battery cable.
3. Remove the following parts: Front scuff plate inner (LH) (See «FRONT SCUFF PLATE REMOVAL/INSTALLATION»(ref-244361-S26008392432006092100000) ). Front side trim (LH) (See «FRONT SIDE TRIM REMOVAL/INSTALLATION»(ref-244361-S28323081802006092100000) ). Side wall (See «SIDE WALL REMOVAL/INSTALLATION»(ref-244361-S31703119622006092100000) ). Shift lever component (MTX) (See «MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION»(ref-244380-S36947017532006092100000) ). Selector lever component (ATX) (See «SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION»(ref-244377-S02725560272006092100000) ). Front console (See «FRONT CONSOLE REMOVAL/INSTALLATION»(ref-244361-S03102331672006092100000) ). Hood release lever (See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION»(ref-244349-S20261737812006092100000) ). Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-244361-S09707910472006092100000) ).
4. Disconnect the blower motor cooling pipe connected to the blower motor.
5. Disconnect the resistor connector.
6. Remove the resistor.
7. Affix the packing 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: Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION»(ref-244361-S09707910472006092100000) ). Hood release lever (See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION»(ref-244349-S20261737812006092100000) ). Front console (See «FRONT CONSOLE REMOVAL/INSTALLATION»(ref-244361-S03102331672006092100000) ). Selector lever component (ATX) (See «SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION»(ref-244377-S02725560272006092100000) ). Shift lever component (MTX) (See «MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION»(ref-244380-S36947017532006092100000) ). Side wall (See «SIDE WALL REMOVAL/INSTALLATION»(ref-244361-S31703119622006092100000) ). Front side trim (LH) (See «FRONT SIDE TRIM REMOVAL/INSTALLATION»(ref-244361-S28323081802006092100000) ). Front scuff plate inner (LH) (See «FRONT SCUFF PLATE REMOVAL/INSTALLATION»(ref-244361-S26008392432006092100000) ).
15. Connect the negative battery cable.
16. Install the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3]»(ref-244326-S41790335602006092100000) ).

Scheme 62

1. Verify that the resistance between the resistor terminals is as shown in the table. If there is any malfunction, replace the resistor. RESISTOR TERMINALS RESISTANCE SPECIFICATIONS Terminal Resistance (ohm) A-D 0.27-0.30 A-B 0.77-0.87 A-C 3.05-3.49

Scheme 63

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-244390-S29108651972006092100000) ).

Scheme 64

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 65

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 66

1. Remove the battery cover. (See «BATTERY REMOVAL/INSTALLATION [L3]»(ref-244326-S41790335602006092100000) ).
2. Disconnect the negative battery cable.
3. Discharge the refrigerant from the system. (See «REFRIGERANT RECOVERY»(ref-244391-S18745100282006092100000) ). (See «REFRIGERANT CHARGING»(ref-244391-S42129033012006092100000) ).
4. Remove the clip and bracket.
5. Disconnect the refrigerant pressure switch connector.
6. Remove the cooler pipe. Do not allow compressor oil to spill. (See «REFRIGERANT LINES REMOVAL/INSTALLATION»(ref-244331-S03928268132006092100000) ). CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediately plug all open fittings after removing any refrigeration cycle parts to keep moisture or foreign material out of the cycle.
7. Remove the refrigerant pressure switch using two spanners.
8. Install in the reverse order of removal.
9. Perform the refrigerant system performance test.

CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

1. Connect the audio unit connector.
2. Connect the climate control unit connector.
3. Turn the ignition switch to the ON position.
4. Connect the negative (-) lead of the tester to body ground.
5. 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 67

TERMINALS VOLTAGE REFERENCE

Scheme 68

CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]

1. Connect the climate control unit connector.
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 69

TERMINALS VOLTAGE REFERENCE

Scheme 70

Scheme 71

Scheme 72

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.