Air Conditioning (Diagnostic Codes & Circuit Tests): Overview Lexus ES XV40 facelift

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1. ACTUATOR CHECK Start the engine and warm it up. Perform the indicator check. Refer to «CHECK MODE PROCEDURE»(ref-396705-S38178367362011050900000) . Push the "R/F" switch to perform the actuator check. HINT: Be sure to perform the actuator check after starting the engine. As the actuator check is repeated from steps 1 to 10 at 1-second intervals, check the temperature and air flow visually and by hand. HINT: The display blinks at 1-second intervals in the step operation. Push the "OFF" switch to finish panel diagnosis. Push the "AUTO" switch to enter the sensor check mode. Step No. Display Code Conditions Blower Level Air Mix Damper Airflow Vent Air Inlet Damper Compressor 1 0 0 0% open FACE FRESH OFF 2 1 1 0% open FACE FRESH OFF 3 2 17 0% open FACE RECIRCULATION / FRESH ON 4 3 17 0% open FACE RECIRCULATION ON 5 4 17 50% open B/L RECIRCULATION ON 6 5 17 50% open B/L RECIRCULATION ON 7 6 17 50% open FOOT FRESH ON 8 7 17 100% open FOOT-0 FRESH ON 9 8 17 100% open F/D FRESH ON 10 9 31 100% open DEF FRESH ON If the steps are difficult to read because they change automatically, push the "UPDr" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "UPDr" switch is pushed. HINT: Push the "OFF" switch to finish panel diagnosis. Push the "R/F" switch to enter the sensor check mode.

DESCRIPTION

This sensor detects the cabin temperature that is used as the basis for temperature control and sends a signal to the A/C amplifier.

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1. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Select the item below in the Data List, and read the display on Techstream. DATA LIST / AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temp (Room Temperature Sensor) Room temperature sensor / Min.: -6.5°C (20.3°F), Max.: 57.25°C (135.05°F) Actual cabin temperature is displayed - OK The display is as specified in the normal condition column. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
2. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with the connectors still connected. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E1-29 (TR) - E1-34 (SG-1) Engine switch on (IG) at 25°C (77°F) 1.35 to 1.75 V E1-29 (TR) - E1-34 (SG-1) Engine switch on (IG) at 40°C (104°F) 0.9 to 1.2 V HINT: As the temperature increases, the voltage decreases. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
3. INSPECT A/C ROOM TEMPERATURE SENSOR Remove the A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E4-1 - E4-2 10°C (50°F) 3.00 to 3.73 kohms E4-1 - E4-2 15°C (59°F) 2.45 to 2.88 kohms E4-1 - E4-2 20°C (68°F) 1.95 to 2.30 kohms E4-1 - E4-2 25°C (77°F) 1.60 to 1.80 kohms E4-1 - E4-2 30°C (86°F) 1.28 to 1.47 kohms E4-1 - E4-2 35°C (95°F) 1.00 to 1.22 kohms E4-1 - E4-2 40°C (104°F) 0.80 to 1.00 kohms E4-1 - E4-2 45°C (113°F) 0.65 to 0.85 kohms E4-1 - E4-2 50°C (122°F) 0.50 to 0.70 kohms E4-1 - E4-2 55°C (131°F) 0.44 to 0.60 kohms E4-1 - E4-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases ( (Scheme 195)the graph). NG --> REPLACE A/C ROOM TEMPERATURE SENSOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the connector from the A/C amplifier. Disconnect the connector from the A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E1-29 (TR) - E4-1 Always Below 1 ohms E1-34 (SG-1) - E4-2 Always Below 1 ohms E1-29 (TR) - Body ground Always 10 kohms or higher E1-34 (SG-1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioner "AUTO" mode. This sensor is connected to the A/C amplifier and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the A/C amplifier. The resistance of the ambient temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as the resistance of the ambient temperature sensor changes.

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1. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Select the item below in the Data List, and read the display on Techstream. DATA LIST / AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Ambi Temp Sens (Ambient Temp Sensor) Ambient temperature sensor / Min: -23.3°C (-9.94°F), Max: 65.95°C (150.71°F) Actual ambient temperature is displayed Open in circuit: -23.3°C (-9.94°F) Short in circuit: 65.95°C (150.71°F) OK The display is as specified in the normal condition column. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
2. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with the connector still connected. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E1-5 (TAM) - E1-13 (SG-2) Engine switch on (IG) at 25°C (77°F) 1.35 to 1.75 V E1-5 (TAM) - E1-13 (SG-2) Engine switch on (IG) at 40°C (104°F) 0.9 to 1.2 V HINT: As the temperature increases, the voltage decreases. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
3. INSPECT AMBIENT TEMPERATURE SENSOR Remove the ambient temperature sensor. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A5-1 - A5-2 10°C (50°F) 3.00 to 3.73 kohms A5-1 - A5-2 15°C (59°F) 2.45 to 2.88 kohms A5-1 - A5-2 20°C (68°F) 1.95 to 2.30 kohms A5-1 - A5-2 25°C (77°F) 1.60 to 1.80 kohms A5-1 - A5-2 30°C (86°F) 1.28 to 1.47 kohms A5-1 - A5-2 35°C (95°F) 1.00 to 1.22 kohms A5-1 - A5-2 40°C (104°F) 0.80 to 1.00 kohms A5-1 - A5-2 45°C (113°F) 0.65 to 0.85 kohms A5-1 - A5-2 50°C (122°F) 0.50 to 0.70 kohms A5-1 - A5-2 55°C (131°F) 0.44 to 0.60 kohms A5-1 - A5-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases ( (Scheme 195)the graph). NG --> REPLACE AMBIENT TEMPERATURE SENSOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - A/C AMPLIFIER) Disconnect the ambient temperature sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A5-2 - E1-5 (TAM) Always Below 1 ohms A5-1 - E1-13 (SG-2) Always Below 1 ohms E1-5 (TAM) - Body ground Always 10 kohms or higher E1-13 (SG-2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioner unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator temperature sensor (A/C thermistor) changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This sensor is used to prevent the evaporator from freezing.

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1. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Select the item below in the Data List, and read the display on Techstream. DATA LIST / AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Evap Fin Temp (Evaporator Fin Thermistor) Evaporator fin thermistor / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.19°F) Actual evaporator temperature is displayed Open in circuit: -29.7°C (-21.46°F) Short in circuit: 59.55°C (139.19°F) OK The display is as specified in the normal condition column. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
2. INSPECT AIR CONDITIONING HARNESS Remove the air conditioning harness (evaporator temperature sensor). Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Y1-5 - Y1-6 -10°C (14°F) 7.30 to 9.10 kohms Y1-5 - Y1-6 -5°C (23°F) 5.65 to 6.95 kohms Y1-5 - Y1-6 0°C (32°F) 4.40 to 5.35 kohms Y1-5 - Y1-6 5°C (41°F) 3.40 to 4.15 kohms Y1-5 - Y1-6 10°C (50°F) 2.70 to 3.25 kohms Y1-5 - Y1-6 15°C (59°F) 2.14 to 2.58 kohms Y1-5 - Y1-6 20°C (68°F) 1.71 to 2.05 kohms Y1-5 - Y1-6 25°C (77°F) 1.38 to 1.64 kohms Y1-5 - Y1-6 30°C (86°F) 1.11 to 1.32 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases ( (Scheme 195)the graph). NG --> REPLACE AIR CONDITIONING HARNESS OK --> REPLACE AIR CONDITIONING AMPLIFIER

The smog ventilation sensor, which is installed on the front of the condenser, is used for automatic air inlet control. This sensor detects CO and HC in the emission gas and transmits signals to the A/C amplifier.

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1. INSPECT FUSE (LH-IG) Remove the LH-IG fuse from the cowl side junction block LH. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Item Condition Specified Condition LH-IG fuse Always Below 1 ohms NG --> REPLACE FUSE (LH-IG) OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Allow exhaust gas (HC, CO) to travel to the sensing portion of the smog ventilation sensor. Select the item below in the Data List, and read the display on Techstream. DATA LIST / AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Emiss Gas Sens (Emission Gas Sensor) Emission gas / Min.: 0 V, Max.: 255 V Smog ventilation sensor value increases as gas amount increases - OK The display is as specified in the normal condition column. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
3. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND) Disconnect the smog ventilation sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A37-6 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY) Disconnect the smog ventilation sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition A37-3 (IG) - Body ground Engine switch on (IG) 10 to 14 V Engine switch off Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT SMOG VENTILATION SENSOR Remove the smog ventilation sensor. Apply battery voltage between terminals 3 (IG) and 6 (E). Allow exhaust gas (HC, CO) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 2 (DGS). OK When the sensor is exposed to the exhaust gas, the resistance increases. HINT: The resistance before blowing exhaust gas is 10 kohms to 40 kohms. NG --> REPLACE SMOG VENTILATION SENSOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - A/C AMPLIFIER) Disconnect the smog ventilation sensor. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A37-1 (SG) - E1-13 (SG-2) Always Below 1 ohms A37-2 (DGS) - E1-6 (DGS) Always Below 1 ohms E1-13 (SG-2) - Body ground Always 10 kohms or higher E1-6 (DGS) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

Scheme 195

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects voltage output from the solar sensor.

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SYSTEM DESCRIPTION

The ECM sends an engine speed signal to the A/C amplifier via CAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor locks, and turns the magnetic clutch off.

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1. CHECK CAN COMMUNICATION SYSTEM Use Techstream to check if the CAN Communication System is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 5 A: Go to next step
2. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with the connectors still connected. Measure the waveform of the connector. Item Contents Tool setting 200 mV/DIV., 10 ms./DIV. Vehicle condition Engine is running A/C switch: ON Blower switch: LO Standard Tester Connection (Symbols) Condition Specified Condition E1-8 (LOCK) - E1-13 (SG-2) Engine is running A/C switch: ON Blower switch: LO Pulse generation Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
3. INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) Disconnect the connector from the A/C compressor. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition B2-1 (SSR+) - B2-2 (SSR-) Always (at 20°C (68°F)) 160 to 320 ohms NG --> REPLACE COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection (Symbols) Condition Specified Condition E1-8 (LOCK) - B2-1 (SSR+) Always Below 1 ohms E1-13 (SG-2) - B2-2 (SSR-) Always Below 1 ohms E1-8 (LOCK) - Body ground Always 10 kohms or higher E1-13 (SG-2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER
5. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396655-S39167772552011050900000)

This DTC is output when refrigerant pressure is extremely low (0.19 MPa (2.0 kgf/cm 2 , 28 psi) or less) or extremely high (3.14 MPa (32.0 kgf/cm 2 , 455 psi) or more). The A/C pressure sensor, which is installed on the pipe of the high pressure side to detect refrigerant pressure, outputs a refrigerant pressure signal to the A/C amplifier. The A/C amplifier converts this signal to pressure according to the sensor characteristics to control the compressor.

HINT

Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if there is no refrigerant in the system.

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1. CHECK REFRIGERANT Check the sight glass of the cooler unit refrigerant liquid pipe. Prepare the vehicle according to the chart below. Item Condition Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C ON Compare the sight glass to the following chart. Item Symptom Amount of Refrigerant Corrective Actions 1 Bubbles visible Insufficient* Check for gas leakage and repair if necessary Recharge with proper amount of refrigerant. Refer to «REPLACEMENT - Step 2»(ref-396681-S41855246662011050900000) 2 No bubbles visible Empty, insufficient, or excessive Refer to 3 and 4 3 No temperature difference between compressor inlet and outlet Empty or nearly empty Check for gas leakage with gas leak detector and repair if necessary Evacuate A/C system and recharge with proper amount of refrigerant. Refer to «REPLACEMENT - Step 2»(ref-396681-S41855246662011050900000) 4 Considerable temperature difference between compressor inlet and outlet Proper or excessive Refer to 5 and 6 5 Immediately after air conditioning is turned OFF, refrigerant clears Excessive Recover refrigerant Evacuate A/C system and recharge with proper amount of refrigerant. Refer to «REPLACEMENT - Step 2»(ref-396681-S41855246662011050900000) 6 Immediately after air conditioning is turned OFF, refrigerant foams and then becomes clear Proper - * : Bubbles in the sight glass with the vehicle interior temperature above 35°C (95°F) can be considered normal if cooling is sufficient. NG --> CHARGE REFRIGERANT OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - A/C AMPLIFIER) Disconnect the pressure sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A1-2 (PR) - E1-9 (PRE) Always Below 1 ohms A1-3 (+) - E1-10 (S5-3) Always Below 1 ohms A1-1 (-) - E1-13 (SG-2) Always Below 1 ohms E1-9 (PRE) - Body ground Always 10 kohms or higher E1-10 (S5-3) - Body ground Always 10 kohms or higher E1-13 (SG-2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT PRESSURE SENSOR Install the manifold gauge set. Refer to «ON-VEHICLE INSPECTION - Step 2»(ref-396681-S01997261062011050900000) . Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 3, and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2, and the negative (-) lead to terminal 1. Measure the voltage. OK The voltage changes according to refrigerant pressure, as shown in the graph. Result Result Proceed to NG A OK (When troubleshooting according to the DTC) B OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) C C --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE B --> REPLACE AIR CONDITIONING AMPLIFIER A --> REPLACE PRESSURE SENSOR

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects output voltage from the solar sensor.

Scheme 208

The air mix damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (passenger seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing temperature.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 209

The damper servo (air inlet control) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION).

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 210

The mode damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air outlet damper to any position, which controls the air outlet switching.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 211

The air mix damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (driver seat) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver seat side is controlled.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

Scheme 212

In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.

Based on this signal, the compressor changes the amount of compressor output.

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1. INSPECT A/C COMPRESSOR Disconnect the A/C compressor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition B1-2 (SOL+) - B1-1 (SOL-) 20°C (68°F) 10 to 11 ohms NG --> REPLACE A/C COMPRESSOR OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - BODY GROUND) Disconnect the A/C compressor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition B1-1 (SOL-) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - A/C AMPLIFIER) Disconnect the A/C compressor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E1-2 (SOL+) - B1-2 (SOL+) Always Below 1 ohms E1-2 (SOL+) - Body ground Always 10 kohms or higher Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A --> REPAIR OR REPLACE HARNESS OR CONNECTOR

The smog ventilation sensor detects NOx in the emission gas and transmits signals to the A/C amplifier. Based on the signals, the A/C amplifier performs automatic air inlet control (FRESH, FRESH/RECIRCULATION, or RECIRCULATION mode).

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1. INSPECT FUSE (LH-IG) Remove the LH-IG fuse from the cowl side junction block LH. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Item Condition Specified Condition LH-IG fuse Always Below 1 ohms NG --> REPLACE FUSE (LH-IG) OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor. Select the item below in the Data List, and read the display on Techstream. DATA LIST / AIR CONDITIONER: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Nox Gas Sens (Emission Gas Nox Sensor) Emission gas NOx sensor / Min.: 0, Max.: 255 Smog ventilation sensor value increases as gas amount increases - OK The display is as specified in the normal condition column. Result Result Proceed to NG A OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B OK (When troubleshooting according to the DTC) C C --> REPLACE AIR CONDITIONING AMPLIFIER B --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE A: Go to next step
3. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND) Disconnect the smog ventilation sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A37-6 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY) Disconnect the smog ventilation sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition A37-3 (IG) - Body ground Engine switch on (IG) 10 to 14 V Engine switch off Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT SMOG VENTILATION SENSOR Remove the smog ventilation sensor. Apply battery voltage between terminals 3 (IG) and 6 (E). Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 4 (DGS1). OK When the sensor is exposed to the exhaust gas, the resistance increases. HINT: The resistance before blowing exhaust gas is 10 kohms to 40 kohms. NG --> REPLACE SMOG VENTILATION SENSOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - A/C AMPLIFIER) Disconnect the exhaust gas sensor connector. Disconnect the A/C amplifier connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A37-1 (SG) - E1-13 (SG-2) Always Below 1 ohms A37-4 (DGS1) - E1-7 (DGS1) Always Below 1 ohms E1-13 (SG-2) - Body ground Always 10 kohms or higher E1-7 (DGS1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE AIR CONDITIONING AMPLIFIER

The air conditioning harness connects the air conditioning amplifier and each servo motor. The air conditioning amplifier supplies power and sends operation instructions to each servo motor through the air conditioning harness. Each servo motor sends the damper position information to the air conditioning amplifier.

Scheme 223

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1. CHECK HARNESS AND CONNECTOR Remove the A/C amplifier. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition E1-14 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. INSPECT AIR CONDITIONING AMPLIFIER Reconnect the connector to the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Y1-2 (BUS G) - E1-14 (GND) Always Below 1 ohms NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
3. INSPECT AIR CONDITIONING AMPLIFIER Disconnect the connector (Y1) from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition Y1-4 (B BUS) - Body ground Engine switch off Below 1 V Y1-4 (B BUS) - Body ground Engine switch on (IG) 10 to 14 V NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
4. REPLACE AIR CONDITIONING HARNESS Replace the air conditioning harness. HINT: Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a normal one and check that the condition returns to normal. Check for DTCs. Result Result Proceed to DTC B1497/97 is output. A DTC B1497/97 is not output. B B --> END A --> REPLACE AIR CONDITIONING AMPLIFIER

Battery voltage is supplied to the A/C control assembly through the A/C fuse and A/C No. 2 fuse.

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1. CHECK HARNESS AND CONNECTOR (IG+, +B - BODY GROUND) Disconnect the connector from the A/C control assembly. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection (Symbols) Condition Specified Condition E3-2 (IG+) - Body ground Engine switch on (IG) 10 to 14 V E3-2 (IG+) - Body ground Engine switch off Below 1 V E3-1 (+B) - Body ground Always 10 to 14 V NG --> See step 3 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (GND - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection (Symbols) Condition Specified Condition E3-18 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE
3. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396671-S23626927902011050900000)

When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MGC relay turns on to operate the magnetic clutch.

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1. CHECK CAN COMMUNICATION SYSTEM Use Techstream to check if the CAN Communication System is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 11 A: Go to next step
2. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Turn the A/C switch on and off. Select the item below in the Data List, and read the display on Techstream. DATA LIST / ENGINE: Tester Display Measurement Item/Range Normal Condition Diagnostic Note A/C Signal (A/C Signal) A/C signal / ON or OFF ON: A/C ON OFF: A/C OFF - OK The display is as specified in the normal condition column. NG --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE OK: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn Techstream on. Select the item below in the Active Test and check that the magnetic clutch relay operates. ACTIVE TEST / AIR CONDITIONER: Tester Display Test Part Control Range A/C Mag Clutch (Magnetic Clutch Relay) Magnetic clutch relay / OFF, ON - OK The magnetic clutch relay operates normally. OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE NG: Go to next step
4. INSPECT FUSE (A/C NO. 2) Remove the A/C No. 2 fuse from the instrument panel J/B. Measure the resistance of the fuse. Standard resistance Tester Item Condition Specified Condition A/C No. 2 fuse Always Below 1 ohms Reconnect the A/C No. 2 fuse to the instrument panel J/B. NG --> REPLACE FUSE (A/C NO. 2) OK: Go to next step
5. INSPECT RELAY (MGC) Remove the MGC relay from the engine room R/B and J/B. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) Install the MGC relay to the engine room R/B and J/B. NG --> REPLACE RELAY (MGC) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Disconnect the connector from the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection (Symbols) Condition Specified Condition E1-20 (MGC) - Body ground Engine switch off Below 1 V E1-20 (MGC) - Body ground Engine switch on (IG) 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. INSPECT AIR CONDITIONING AMPLIFIER Reconnect the connector to the A/C amplifier. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection (Symbols) Condition Specified Condition E1-20 (MGC) - Body ground Engine switch on (IG) A/C switch: OFF 10 to 14 V E1-20 (MGC) - Body ground Engine switch on (IG) A/C switch: ON Below 1 V NG --> REPLACE AIR CONDITIONING AMPLIFIER OK: Go to next step
8. INSPECT A/C COMPRESSOR Disconnect the connector from the A/C compressor. Disconnect the connector from the magnetic clutch. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection (Symbols) Condition Specified Condition B2-3 (MG+) - A-1 Always Below 1 ohms B2-3 (MG+) - Body ground Always 10 kohms or higher NG --> REPLACE A/C COMPRESSOR OK: Go to next step
9. INSPECT MAGNETIC CLUTCH Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition A-1 - Body ground Always 3.4 to 3.8 ohms When connector terminal A-1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch's operating sound can be heard, and 2) the magnetic clutch's hub and rotor lock. NG --> REPLACE MAGNETIC CLUTCH OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B AND J/B - BATTERY) Remove the MGC relay from the engine room R/B and J/B. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Specified Condition Relay block MGC relay terminal 5 - Body ground 10 to 14 V Relay block MGC relay terminal 1 - Body ground 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM R/B AND J/B - A/C COMPRESSOR)
11. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396655-S39167772552011050900000)

The main power source is supplied to the A/C amplifier when the engine switch is turned on (IG).

The power source is used for operating the A/C amplifier and servo motor, etc.

Scheme 239

The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when turning the engine switch off and is used for diagnostic trouble code memory, etc.

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1. INSPECT FUSE (A/C) Remove the A/C fuse from the instrument panel J/B. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Item Condition Specified Condition A/C fuse Always Below 1 ohms NG --> REPLACE FUSE (A/C) OK: Go to next step
2. INSPECT AIR CONDITIONING AMPLIFIER (AIR CONDITIONING AMPLIFIER - BODY GROUND) Disconnect the A/C amplifier connector. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition E1-21 (B) - Body ground Always 10 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE

The operation signal of a switch etc. is exchanged between terminal TX+ of the A/C control assembly and terminal LIN1 of the A/C amplifier.

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1. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER) Disconnect the connector from the A/C control assembly. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection (Symbols) Condition Specified Condition E1-37 (LIN1) - E3-15 (TX+) Always Below 1 ohms E1-37 (LIN1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-396705-S36743094562011050900000) PROBLEM SYMPTOMS TABLE