Cooling is Poor [11/2018 - 02/2019]: Procedure

1. Confirm setup of the ECO drive mode and turn it off if it is on.

   HINT: 

   • When ECO drive mode is on, the air conditioning amplifier assembly ensures a minimum level of air conditioning control based on certain conditions, thereby contributing to improved fuel efficiency. Accordingly, explain to customers that the air volume will be weaker in these situations.

     Control	Control Summary
     Airflow Control	Automatically switches the air inlet port to the internal air circulation mode when the outside air temperature is equal to or higher than a predetermined temperature and reduces the power consumption.
     Air Inlet Control	Sets the blower level in AUTO mode lower than normal, and suppresses the power consumption.

   • If integration control and panel assembly (ECO switch) is malfunctioning, perform diagnosis on the ECO switch circuit.

     Refer to ECO Switch Circuit [11/2018 - 02/2019] 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Air Conditioner > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Regulator Pressure Sensor	Air conditioner pressure sensor	Min.: -456.6 kPaG (gauge) Max.: 3294.3 kPaG (gauge)	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioner pressure sensor system malfunction

   Body Electrical > Air Conditioner > Data List 

   Tester Display
   Regulator Pressure Sensor

6. Install a manifold gauge set.
   1. for HFC-134a (R134a): Refer to ON-VEHICLE INSPECTION [11/2018 - 08/2020]
   2. for HFO-1234yf (R1234yf): Refer to ON-VEHICLE INSPECTION [11/2018 - 02/2019]
7. Read the manifold gauge pressure when the following conditions are met.
   1. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:
      
      

      Item	Condition
      Vehicle Condition	Power switch on (READY)
      Doors	Fully closed (windows also fully closed)
      A/C Switch	On
      Recirculation/fresh Control Switch	Recirculation
      Set Temperature	MAX COLD
      Blower Speed	HI
      Air Conditioning Air Inlet Temperature	25 to 35°C (77 to 95°F)

      Standard Pressure

      Low pressure side 

      150 to 250 kPa (1.5 to 2.5 kgf/cm ² , 22 to 36 psi)

      High pressure side 

      1370 to 1570 kPa (14 to 16 kgf/cm ² , 199 to 228 psi)

8. Compare the values displayed in the Data List and on the manifold gauge.

   OK

   The values displayed in the Data List and on the manifold gauge match.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CHARGE SYSTEM WITH REFRIGERANT 

1. for HFC-134a (R134a): Refer to REPLACEMENT [11/2018 - 08/2020]
2. for HFO-1234yf (R1234yf): Refer to REPLACEMENT [11/2018 - 02/2019]

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
5. Check the operation by referring to the table below.

   Body Electrical > Air Conditioner > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Air Mix Servo Targ Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse	Min.: 128 Max.: 383	Operates between 165 to 257 pulses
   Air Mix Servo Targ Pulse(P)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse	Min.: 128 Max.: 383	Operates between 255 to 347 pulses

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Air Mix Servo Targ Pulse(D)

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Air Mix Servo Targ Pulse(P)

   OK

   Damper servo motor is operated.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO DTC OF APPLICABLE SERVO MOTOR OPERATING ABNORMALLY 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2018 - 02/2019]

Result: 

OK 

See step  4

1. Disconnect the H1 automatic light control sensor connector.
2. Disconnect the G44 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H1-1 (CLTB) - G44-23 (CLTB)	Always	Below 1 Ω
   H1-2 (CLTE) - G44-25 (CLTE)	Always	Below 1 Ω
   H1-4 (CLTS) - G44-24 (CLTS)	Always	Below 1 Ω
   H1-1 (CLTB) or G44-23 (CLTB) - Other terminals and body ground	Always	10 kΩ or higher
   H1-2 (CLTE) or G44-25 (CLTE) - Other terminals and body ground	Always	10 kΩ or higher
   H1-4 (CLTS) or G44-24 (CLTS) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the automatic light control sensor.

   Refer to REMOVAL [11/2018 - 02/2019]

2. Inspect the automatic light control sensor.

   Refer to ON-VEHICLE INSPECTION [11/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO ON-VEHICLE INSPECTION 

Refer to PROCEDURE - Step 2

Result: 

NG 

REPLACE AUTOMATIC LIGHT CONTROL SENSOR 

Refer to REMOVAL [11/2018 - 02/2019]