Control System (HVAC): Diagnosis Mazda 6 GH

PWM UNIT INSPECTION [L3, AJ]

1. Connect the PWM unit connector.
2. Turn the ignition switch to ON position.
3. Measure the voltage at each PWM unit terminal and refer to . If not as specified, inspect the parts listed under "Action" and the related wiring harness.

Scheme 23

PWM UNIT CONNECTOR TERMINALS VOLTAGE LIST (REFERENCE)

Scheme 24

1. Disconnect the negative battery cable.
2. Remove the glove compartment.
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 25

1. Verify that the resistance between the terminals of the resistor is as shown in the table. If not as specified, replace the resistor. RESISTOR RESISTANCE SPECIFICATIONS Terminal Resistance (ohm) A-D 0.25 A-B 0.85 A-C 2.70

Scheme 26

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 [L3, AJ]»(ref-288779-S15308897932008062500000) .

Scheme 27

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 bolt.

Scheme 28

1. When installing a new pressure plate, A/C compressor pulley, stator, or A/C compressor body, replace the snap ring.

Scheme 29

Scheme 30

1. Measure the clearance around the entire circumference between the pressure plate and A/C compressor pulley using a thickness gauge.
2. Verify that the clearance is within the specification. If not within the specification, remove the pressure plate and adjust the clearance by changing the shim ( 0.2 mm {0.008 in}, 0.5 mm {0.02 in} ) or the number of shims. Magnetic clutch clearance 0.3-0.6 mm {0.012-0.023 in}

Scheme 31

Scheme 32

1. Connect battery positive voltage to terminal A of magnetic clutch and ground to A/C compressor body.
2. Verify that the magnetic clutch operates. If not as specified, replace the stator.

Scheme 33

1. Disconnect the negative battery cable.
2. Remove the solar radiation sensor from the dashboard using a tape-wrapped flathead screwdriver.
3. Install in the reverse order of removal.

Scheme 34

1. Shine a fluorescent light or expose the solar radiation sensor to natural sunlight.
2. Connect positive (+) lead to terminal A and negative (-) lead to terminal B of the solar radiation sensor. If the output voltage is not over 0.02V and not less 0.45 V , replace the solar radiation sensor.

Scheme 35

1. Disconnect the negative battery cable.
2. Remove the radiator grille. See «RADIATOR GRILLE REMOVAL/INSTALLATION.»(ref-288738-S17220099732008062500000)
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 36

1. Measure the temperature around the ambient temperature sensor.
2. 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 37

1. Disconnect the negative battery cable.
2. Remove the lower panel. See «LOWER PANEL REMOVAL/INSTALLATION.»(ref-288737-S38536554682008062500000)
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 38

1. Measure the temperature around the passenger compartment temperature sensor.
2. Measure the resistance between terminals of the passenger compartment temperature sensor. If the resistance is not as shown in the graph, replace the passenger compartment temperature sensor.