DESCRIPTION If cool air
blows from the registers regardless of the temperature setting of the
air conditioning system, the following factors may be the cause. |
Symptom | Factor |
- No warm air comes out
- (Blower control is normal)
- Outlet air temperature does not increase
- (Blower control is normal)
|
- Engine coolant temperature (low)
- Refrigerant volume (low)
- No. 1 air conditioning radiator damper servo sub-assembly malfunction
- Warm-up control
- Blockage in heater radiator unit sub-assembly
- Heater radiator unit sub-assembly malfunction
| PROCEDURE
| 1. |
READ VALUE USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List. (e) Read the Data List according to the display on the Techstream. Powertrain > Engine > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Coolant Temperature | Engine coolant temperature |
Min.: -40°C (-40°F), Max.: 140°C (284°F) |
75 to 100°C (167 to 212°F): After warming up |
This is the engine coolant temperature.
HINT:
- After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
- After a long soak, the engine coolant temperature, intake air
temperature and ambient air temperature will be approximately equal.
- If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
- Check if the engine overheats if the value indicated is higher than 135°C (275°F).
| Powertrain > Engine > Data List
|
Tester Display | | Coolant Temperature |
OK: After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.
| NG |
 | GO TO COOLING SYSTEM |
|
OK |
 | |
| 2. |
PERFORM ACTIVE TEST USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream. 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 and 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 and 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: Each damper servo motor operates.
| OK |
| REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY |
| NG |
| GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR | | 
