Home ReviewsRefund Car not listed?
Home/Mazda/MX-5/Mazda MX-5 NC рестайлинг (2008-2015)/Repair manual/Automatic HVAC System/Control System - HVAC (Full Auto Air Conditioner): Diagnosis
Contents Section: Automatic HVAC System All sections

Control System - HVAC (Full Auto Air Conditioner): Diagnosis Mazda MX-5 NC рестайлинг

Automatic HVAC System 4 illustrations ~237 words

EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER]

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

Scheme 38

Scheme 38: EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER]
Scheme 38: EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER]
  1. Set the fan speed MAX-HI.
  2. Set the temperature control to MAX COLD.
  3. Set the air intake mode to RECIRCULATE.
  4. Turn the A/C switch off.
  5. Close all of the doors and roll up all the windows.
  6. Wait for 5 min .
  7. Disconnect the evaporator temperature sensor connector.
  8. Measure the temperature at the air intake.
  9. Measure the resistance between evaporator temperature sensor terminals. If the characteristics of the evaporator temperature sensor are not as shown in the graph, replace the evaporator temperature sensor.

Scheme 39

Scheme 39: REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER]
Scheme 39: REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER]
  1. Remove the battery cover.
  2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]»(ref-430294-S35932810402011101700000) )
  3. Discharge the refrigerant from the system. (See «REFRIGERANT CHARGING»(ref-430347-S23646399522011101700000) )
  4. Remove in the order indicated in the illustration.
  5. Install in the reverse order of removal.

CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

  1. Switch the ignition to ON.
  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, replace the climate control unit.

Scheme 40

Scheme 40: Terminal Voltage Table (Reference)
Scheme 40: Terminal Voltage Table (Reference)
TerminalSignal nameConnected toMeasurement conditionVoltage (V)Inspection item (s)
AIG2A/C 7.5 A fuseIG SW ONB+Related wiring harness A/C 7.5 A fuse
IG SW LOCK1.0 or less
BB+ROOM 15 A fuseUnder any conditionB+Related wiring harness ROOM 15 A fuse
CBlower fan speed controlPower MOS FETFan stopped1.0 or lessRelated wiring harness Power MOS FET
Fan: manual LO2.8
Fan: manual HI9.9
DTNS signalTNS relayHeadlight switch OFF1.0 or lessRelated wiring harness TNS relay Headlight switch
Headlight switch ONB+
EBlower motor feedbackPower MOS FETFan stoppedB+Related wiring harness Power MOS FET Blower motor Blower relay HEATER 40 A fuse Power MOS FET replacement
Fan: manual LO8.17
Fan: manual HI0.6
FPanel control signalInstrument clusterHeadlight switch OFF0Related wiring harness Instrument cluster Climate control unit: terminal voltage (D)
Headlight switch ON2.7
GActuator powerAir intake actuator Air mix actuator Airflow mode actuatorIG SW ONB+Related wiring harness Air intake actuator Air mix actuator Airflow mode actuator
IG SW LOCK1.0 or less
HGNDBody groundUnder any condition1.0 or lessRelated wiring harness
IActuator operation signalAir intake actuator Air mix actuator Airflow mode actuatorBecause this terminal is for communication, good/no good judgment by terminal voltage is not possible.Related wiring harness Air intake actuator Air mix actuator Airflow mode actuator
JAmbient temperature outputInstrument clusterBecause this terminal is for communication, good/no good judgment by terminal voltage is not possible.Related wiring harness Instrument cluster
KA/CRefrigerant pressure switchA/C switch ON, fan switch at 1st1.0 or lessRelated wiring harness Refrigerant pressure switch PCM: terminal voltage (1AU)
A/C switch OFFB+
LVehicle speedInstrument clusterBecause this terminal is for communication, good/no good judgment by terminal voltage is not possible.Related wiring harness
MEvaporator temperature sensor inputEvaporator temperature sensorCompared with temperature detected by evaporator temperature sensor(Scheme 41)Related wiring harness Evaporator temperature sensor
NRear window defroster operationRear window defroster relayRear window defroster switch OFFB+Related wiring harness Rear window defroster relay
Rear window defroster switch ON1.0 or less
OPassenger compartment temperature sensor inputPassenger compartment temperature sensorCompared with temperature detected by passenger compartment temperature sensor(Scheme 41)Related wiring harness Passenger compartment temperature sensor
QSolar radiation sensor inputSolar radiation sensorExpose the solar radiation sensor to natural sunlight4.7Related wiring harness Inspect solar radiation sensor
Light to solar radiation sensor blockBelow 1.0
RWater temperature inputInstrument clusterBecause this terminal is for communication, good/no good judgment by terminal voltage is not possible.Related wiring harness Instrument cluster
SSensor GNDAmbient temperature sensor Passenger compartment temperature sensor Evaporator temperature sensor Solar radiation sensorUnder any condition1.0 or lessRelated wiring harness
TAmbient temperature sensor inputAmbient temperature sensorCompared with temperature detected by ambient temperature sensor(Scheme 41)Related wiring harness Ambient temperature sensor

TERMINAL VOLTAGE CHART

Scheme 41

Scheme 41
Scheme 41

More articles — Control System - HVAC (Full Auto Air Conditioner)