IDENTIFICATION
Note. Vehicles with factory installed fluorescent dye have a green label. Vehicles without factory installed fluorescent dye have a blue label.
IDENTIFICATION LABEL FOR VEHICLE
Vehicles with factory installed fluorescent dye have this identification label on the front side of hood.
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GENERAL INFORMATION
- The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable compressor do not drop too far below 5°C (41°F) when: Evaporator intake air temperature is less than 20°C (68°F). Engine is running at speeds less than 1,500 rpm. This is because the V-6 compressor provides a means of "capacity" control. The V-6 variable compressor provides refrigerant control under varying conditions. During cold winters, it may not produce high refrigerant pressure discharge (compared to previous units) when used with air conditioning systems. A "clanking" sound may occasionally be heard during refrigerant charge. The sound indicates that the tilt angle of the wobble (swash) plate has changed and is not a problem. For air conditioning systems with the V-6 compressor, the clutch remains engaged unless: the system main switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are low or when the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
- CHECK LUBRICANT RETURN OPERATION Can lubricant return operation be performed? A/C system works properly. There is no evidence of a large amount of lubricant leakage. YES or NO YES >> GO TO 2. NO >> GO TO 3 .
- PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS: Start engine, and set the following conditions: Test condition Engine speed: Idling to 1,200 rpm A/C or AUTO switch: ON Blower speed: Max. position Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).] Intake position: Recirculation (REC) Perform lubricant return operation for about 10 minutes. Stop engine. CAUTION: If excessive lubricant leakage is noted, do not perform the lubricant return operation. >> GO TO 3.
- CHECK COMPRESSOR Should the compressor be replaced? YES or NO YES >> GO to " «LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT»(ref-181236-S05383713812005080100000) ". NO >> GO TO 4.
- CHECK ANY PART Is there any part to be replaced? (Evaporator, condenser, liquid tank or in case there is evidence of a large amount of lubricant leakage.) YES or NO YES >> GO to " «LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COMPRESSOR»(ref-181236-S01111245492005080100000) ". NO >> Carry out the A/C performance test.
Description of Air Conditioner LAN Control System
The LAN system consists of auto amp., mode door motor, air mix door motor and intake door motor. A configuration of these components is shown in the diagram below.
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OPERATION
The auto amplifier receives data from each of the sensors. The amplifier sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the auto amplifier and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the auto amplifier.
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Description of Control System
The control system consists of input sensors, switches, the automatic amplifier (microcomputer) and outputs. The relationship of these components is shown in the diagram below
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DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to applicable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished by starting the engine (turning the ignition switch ON) and pressing OFF switch for at least 5 seconds. The "OFF" switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one step to another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pushing (fan) UP switch.
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- SET IN SELF-DIAGNOSTIC MODE Turn ignition switch ON. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press OFF switch for at least 5 seconds. CAUTION: If battery voltage drops below 12V during diagnosis step-3, actuator speed becomes slower and as a result, the system may generate an error even when operation is normal. To avoid this, start engine before performing this diagnosis. >> GO TO 2.
- STEP-1: LEDS AND DISPLAY ARE CHECKED Check LED illumination and display screen. OK or NG OK >> GO TO 3. NG >> Malfunctioning OFF switch, LED or auto amp. Refer to " «MULTIPLEX COMMUNICATION CIRCUIT»(ref-181236-S07594665412005080100000) ".
- CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2 Turn the temperature dial clockwise. Advance to self-diagnosis STEP-2? YES or NO YES >> GO TO 4. NO >> Malfunctioning temperature dial. >> Replace multifunction switch.
- CHECK TO RETURN SELF-DIAGNOSIS STEP-1 Turn the temperature dial counterclockwise. Return to self-diagnosis STEP-1? YES or NO YES >> GO TO 5. NO >> Malfunctioning temperature dial. >> Replace multifunction switch.
- STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT Turn the temperature dial clockwise. Does code No. 20 appear on the display? YES or NO YES >> GO TO 6. NO >> GO TO 14 .
- STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED Turn the temperature dial clockwise. Does code No. 30 appear on the display? YES or NO YES >> GO TO 7. NO >> GO TO 15 .
- STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED Turn the temperature dial clockwise. Press DEF switch, code No. of each actuator test is indicated on the display. >> GO TO 8.
- CHECK ACTUATORS Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation. Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for improper operation. OK or TO OK >> GO TO 9. NG >> Air outlet does not change. Go to Mode Door Motor " «DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR»(ref-181236-S12283341722005080100000) ". Intake door does not change Go to Intake Door Motor " «DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR»(ref-181236-S05704161732005080100000) " Blower motor operation is malfunctioning. Go to Blower Motor " «DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR»(ref-181236-S10870815172005080100000) " Magnet clutch does not engage. Go to Magnet Clutch " «DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH»(ref-181236-S22146113382005080100000) " Discharge air temperature does not change. Go to Air Mix Door Motor " «DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR»(ref-181236-S23732799132005080100000) ".
- STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED Turn the temperature dial clockwise. Code No. 51 appears on the display. >> GO TO 10.
- CHECK AMBIENT SENSOR Press (DEF) switch one time, temperature detected by ambient sensor is indicated on the display. NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor. OK or NG OK >> GO TO 11. NG >> GO TO " «AMBIENT SENSOR CIRCUIT»(ref-181236-S24777924632005080100000) ".
- CHECK IN-VEHICLE SENSOR Press (DEF) switch the second time, temperature detected by invehicle sensor is indicated on the display. NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor. OK or NG OK >> GO TO 12. NG >> Go to " «IN-VEHICLE SENSOR CIRCUIT»(ref-181236-S10027965792005080100000) ".
- CHECK INTAKE SENSOR Press (DEF) switch the third time, temperature detected by intake sensor is indicated on the display. NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor. OK or NG OK >> GO TO 13. NG >> Go to " «INTAKE SENSOR CIRCUIT»(ref-181236-S20433432312005080100000) ".
- CHECK MULTIPLEX COMMUNICATION ERROR Press intake switch. Multiplex communication error between AV control unit (AV and NAVI control unit) and auto amp. is detected. (If plural errors occur, the display of each error will blink two times for 0.5 second intervals.) OK or NG OK >> Turn ignition switch OFF or AUTO switch ON. END NG >> Go to " «MULTIPLEX COMMUNICATION CIRCUIT»(ref-181236-S07594665412005080100000) ".
- CHECK MALFUNCTIONING SENSOR Refer to the following chart for malfunctioning code No. (If two or more sensors malfunction, corresponding code Nos. blink respectively two times.) *1: Conduct self-diagnosis STEP-2 under sunshine. When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indicate despite that sunload sensor is functioning properly. >> INSPECTION END
- CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH Mode or (and) intake door motor position switch(es) is (are) malfunctioning. >> INSPECTION END
Operational Check
The purpose of the operational check is to confirm that the system operates properly.
- Conditions : Engine running and at normal operating temperature
System Operation
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the auto amplifier and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the auto amplifier.
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The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the auto amplifier and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the auto amplifier.
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The intake door control determines intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When the ECON, DEFROST or OFF switches are pushed, the auto amplifier sets the intake door at the FRESH position.
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SYSTEM DESCRIPTION
Auto amplifier controls compressor operation by ambient temperature and signal from ECM.
COMPONENT DESCRIPTION
The sunload sensor is located on the left defroster grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the auto amplifier.
