HVAC System Check

HVAC System Check

1. Customer complaint analysis

Perform "Customer Complaint Analysis".

Was customer complaint analysis performed?
YES -
Go to Step 2.
NO -
Perform customer complaint analysis.

2. Visual inspection

Perform "Visual Inspection".

Is there any faulty condition?
YES -
Repair or replace malfunctioning part.
NO -
Go to Step 3.

3. DTC check

Perform "DTC Check".

Is it malfunctioning code?
YES -
Go to Step 4.
NO -
Go to Step 5.

4. Troubleshooting for DTC

Perform troubleshooting for applicable DTC.

Are check and repair completed?
YES -
Go to Step 7.
NO -
Check and repair malfunctioning part(s).

5. Check for intermittent problem

Check for intermittent problem.

Is there faulty condition?
YES -
Repair or replace malfunctioning part(s).
NO -
Go to Step 6.

6. Air conditioning system symptom diagnosis

Inspect and repair referring to HVAC System Symptom Diagnosis HVAC System Symptom Diagnosis.

Are inspection and repair complete?
YES -
Go to Step 7.
NO -
Inspect and repair malfunctioning part(s).

7. Final confirmation test

Perform final confirmation test.

Is there any problem symptom, DTC or abnormal condition?
YES -
Go to Step 4.
NO -
Air conditioning system is in good condition.

Customer Complaint Analysis

Record details of the problem (failure, complaint) and how it occurred as described by the customer.

For this purpose, use of such a questionnaire form will facilitate collecting information required for proper analysis and diagnosis.

NOTE:

This form is a standard sample. It should be modified according to characteristics of each market.

Customer questionnaire (example)






Visual Inspection

As a preliminary step, be sure to perform visual check of the items that support proper functioning of the air conditioning system. Visual Inspection

DTC Check

Refer to DTC Check DTC Check
for checking procedure.

Troubleshooting for DTC

Perform applicable DTC troubleshooting and repair or replace faulty parts.

Check for Intermittent Problem

Check parts where intermittent trouble can easily occur (e.g., wire harness, connector, etc.). Intermittent Connection and Poor Contact Inspection

Air Conditioning System Symptom Diagnosis

Check the parts or system suspected as a possible cause. HVAC System Symptom Diagnosis

Final Confirmation Test

Confirm that the problem symptom is gone and the air conditioning system is free from any abnormalities. If what has been repaired is related to DTC, clear DTC once, perform DTC confirmation procedure and confirm that no DTC is indicated.