Pinpoint Test B: Unable to Duplicate the Customer Concern and No DTCs Present
Climate Control System
Pinpoint Tests
Pinpoint Test B: Unable to Duplicate the Customer Concern and No DTCs Present
Normal Operation
The purpose of this pinpoint test is to test the functions of the HVAC system and to identify the correct pinpoint test symptom.
This pinpoint test is intended to diagnose the following:
- Incorrect functioning of the HVAC system
PINPOINT TEST B: UNABLE TO DUPLICATE THE CUSTOMER CONCERN AND NO DTCs PRESENT
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B1 CARRY OUT THE MODULE SELF-TEST
- Ignition ON.
- Carry out the PCM module self-test. Record the DTCs displayed, if any.
- Were any DTCs displayed as a result of the self-tests?
Yes
REFER to the PCM DTC Chart. CARRY OUT the necessary diagnosis and REPAIR as required.
No
GO to B2.
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B2 CHECK THE BLOWER MOTOR OPERATION
- Select PANEL mode.
- Observe blower motor operation and select each blower motor speed.
- Does the blower motor operate in all selections and change speed in each?
Yes
GO to B3.
No
If the blower motor does not operate in any setting, GO to Pinpoint Test I. Pinpoint Test I: The Blower Motor is Inoperative
If the blower motor does not properly change speeds or shut OFF, GO to Pinpoint Test J. Pinpoint Test J: The Blower Motor Does Not Operate Correctly
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B3 CHECK AIRFLOW OPERATION
- Select the highest blower motor setting.
- NOTE: Refer to Description and Operation for proper airflow descriptions.
- While observing the airflow, select each of the airflow positions (PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST, DEFROST).
- Is the airflow directed to the proper outlets?
Yes
GO to B4.
No
GO to Pinpoint Test C. Pinpoint Test C: Incorrect/Erratic Direction of Airflow From Outlet(s)
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B4 VERIFY TEMPERATURE CONTROL OPERATION
- Start the vehicle and allow it to reach normal operating temperature.
- With the A/C OFF, select PANEL mode.
- Change the temperature setting from the coldest to the warmest and back to the coldest.
- Does the temperature change between very warm to cool?
Yes
GO to B5.
No
If the temperature does not get very warm, GO to Pinpoint Test D. Pinpoint Test D: Insufficient, Erratic or No Heat
If the temperature does not change at all, GO to Pinpoint Test H. Pinpoint Test H: Temperature Control is Inoperative/Does Not Operate Correctly
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B5 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF
- With the A/C OFF, select PANEL mode.
- Select the coldest temperature setting.
- Is the outlet temperature close to ambient temperature?
Yes
GO to B6.
No
If the temperature is warmer than ambient temperature, GO to Pinpoint Test H and diagnose for inoperative blend door. Pinpoint Test H: Temperature Control is Inoperative/Does Not Operate Correctly
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, GO to Pinpoint Test G. Pinpoint Test G: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded ON
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, GO to Pinpoint Test F. Pinpoint Test F: The Air Conditioning (A/C) Is Always On - A/C Compressor Does Not Cycle
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B6 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE
- Make sure the ambient air temperature is above 2°C (35°F).
- Select A/C mode.
- Does the A/C clutch engage when the A/C mode is selected?
Yes
GO to B7.
No
GO to Pinpoint Test E. Pinpoint Test E: The Air Conditioning (A/C) is Inoperative
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B7 CHECK THE RECIRC OPERATION
- Select A/C mode.
- Select the highest blower motor setting.
- Observe airflow noise.
- Select MAX A/C mode.
- Does the airflow noise increase when the MAX A/C mode is selected?
Yes
The system is operating normally.
No
GO to Pinpoint Test C. Pinpoint Test C: Incorrect/Erratic Direction of Airflow From Outlet(s)
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