Step | Action | Yes | No |
|---|---|---|---|
1 |
Does the digit flash ON and OFF? | Go to Step 2 | Go to Step 3 |
2 | Perform the Diagnostic System Check - HVAC Systems - Automatic . Does the display indicate any error codes? | Go to Step 7 | |
3 | Observe the blower motor operation. Is the blower motor functioning at all? | Go to Step 4 | Go to Blower Motor Inoperative |
4 | Use the blower push switch to cycle the blower through its different speeds. Does the motor function at different speeds? | Go to Step 5 | Go to Diagnostic Trouble Code (DTC) List - Vehicle and use DTC 6. |
5 |
Does the air flow from the different outlets as it should? | Go to Step 7 | Go to Step 6 |
6 |
Is the heater operating? | System OK | Go to Step 9 |
7 | Observe the air mix door (AMD) motor while changing the temperature setting from 18-32°C (64-90°F) and then from 32-18°C (90-64°F). Is the AMD motor functioning properly? | Go to Step 8 | Go to Diagnostic Trouble Code (DTC) List - Vehicle and use DTC 3. |
8 | Perform the checks found in HVAC Preliminary Checks . Is the system operating normally now? | System OK | Go to Step 9 |
9 | Place the controller in the AUTO mode. Is any air taken into the intake port of the in-car sensor? | Go to Step 12 | Go to Step 10 |
10 | Inspect the intake hose for the in-car sensor. Is the hose in good condition? | Go to Step 12 | Go to Step 11 |
11 | Repair or replace the intake hose. Did you find and correct the condition? | System OK | -- |
12 | Inspect the in-car sensor using the tests in DTC 1. Refer to Diagnostic Trouble Code (DTC) List - Vehicle . Is there a problem indicated in the sensor, the sensor wiring, or the controller? | Go to Step 13 | Go to Step 14 |
13 | Repair or replace the sensor, the wiring, or the controller as required. Did you find and correct the condition? | System OK | -- |
14 | Inspect the ambient air temperature sensor using the tests in DTC 2. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Is there a problem indicated in the sensor, the sensor wiring, or the controller? | Go to Step 15 | Go to Step 16 |
15 | Repair or replace the sensor, the wiring, or the controller, as required. Did you find and correct the condition? | System OK | -- |
16 | Inspect the sun sensor using the tests in DTC 5. Refer to Diagnostic Trouble Code (DTC) List - Vehicle . Is there a problem indicated in the sensor, the sensor wiring, or the controller? | Go to Step 17 | Go to Step 18 |
17 | Repair or replace the sensor, the wiring, or the controller as required. Did you find and correct the condition? | System OK | -- |
18 | Perform the coolant temperature sensor test. Is the coolant temperature sensor malfunctioning? | Go to Step 19 | Go to Step 20 |
19 | Replace the coolant temperature sensor. Did you complete the replacement? | System OK | -- |
20 | Replace the automatic temperature control (ATC) controller. Did you complete the replacement? | System OK | -- |
