Engine and Emission Control System Check

Engine and Emission Control System Check

NOTE: Refer to items under checking procedure for details of each step.

Step 1-6:

Step 7-11:

Step 1: 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 an inspection form will facilitate collecting information required for proper analysis and diagnosis.

Customer problem inspection form (Example)






NOTE: This form is a standard sample. It should be modified according to conditions characteristic of each market.

Step 2: DTC / Freeze Frame Data Check, Record and Clearance

First, check DTC (current and pending DTC).
If DTC is indicated, print it and freeze frame data or write them down and then clear them.

Step 3 and 4: Visual Inspection

As a preliminary step, be sure to perform visual check of the items that support proper function of engine.

Step 5: Trouble Symptom Confirmation

In case that there is no DTC at Step 2:
Based on information obtained in Step 1: Customer Complaint Analysis and Step 2: DTC / Freeze Frame Data Check, Record and Clearance, confirm trouble symptoms.
In case that there is any DTC at Step 2:
Recheck DTC according to "DTC Confirmation Procedure" described in each DTC troubleshooting.

Step 6 and 7: Rechecking and Recording DTC / Freeze Frame Data

Refer to DTC Check: Reading Diagnostic Trouble Codes for checking procedure.

Step 8: Engine Basic Inspection and Engine Symptom Diagnosis

1. Perform basic engine inspection.
2. In case there is no faulty part found in inspection procedure of "Engine basic inspection", perform Engine Symptom Diagnosis Engine Symptom Diagnosis based on symptom found in vehicle checking in the following steps.
- Customer complaint analysis
- Trouble symptom confirmation

Step 9: Troubleshooting for DTC

Perform applicable DTC troubleshooting and repair or replace faulty parts.

Step 10: Intermittent Problem Check

In case that there is no DTC at Step 2:
Check for intermittent problem.
In case that there is any DTC at Step 2:
Check parts related to detected DTC (e.g., wire harness, connector, etc.).

Step 11: Final Confirmation Test

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