Intro

ENGINE DIAGNOSTIC FLOW CHART

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 to the point required for proper analysis and diagnosis.

2. DIAGNOSTIC TROUBLE CODE (DTC)/FREEZE FRAME DATA CHECK, RECORD AND CLEARANCE
First, check DTC, referring to "DTC check" section. If DTC is indicated, print it and freeze frame data or write them down and then clear them by referring to DTC clearance section. DTC indicates malfunction that occurred in the system but does not indicate whether it exists now or it occurred in the past and the normal condition has been restored now. To check which case applies, check the symptom in question according to Step 4 and recheck DTC according to Step 5.

Attempt to diagnose a trouble based on DTC in this step only or failure to clear the DTC (including pending DTC) in this step will lead to incorrect diagnosis, trouble diagnosis of a normal circuit or difficulty in troubleshooting.

NOTE:
- If only DTC P0461 (Fuel level sensor circuit performance problem) is indicated in this step, perform visual inspection according to Step 3 and then proceed to DTC P0461 Flow Chart.
- For A/T vehicle, if only DTC P0705, P0720, P0741, P0743, P0751, P0753, P0756, P0758, or P1875 is indicated in this step, proceed to Transmission Control Systems

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

4. TROUBLE SYMPTOM CONFIRMATION
Based on information obtained in Step 1 Customer complaint analysis and Step 2 DTC/freeze frame data check, confirm trouble symptoms. Also, reconfirm DTC according to "DTC Confirmation Procedure" described in each Trouble Code Diagnostic Procedure.
Testing and Inspection

5. DTC/FREEZE FRAME DATA RECHECK, RECORD AND CLEARANCE
Refer to How to Display and Read Diagnostic Trouble Codes for checking procedure.
Reading Diagnostic Trouble Codes

6. ENGINE BASIC CHECK AND SYMPTOMS-TO-DIAGNOSIS MATRIX TABLE
Perform basic engine check according to the "Engine Basic Check Flow Chart" first. When the end of the flow chart has been reached, check the parts of the system suspected as a possible cause referring to Diagnosis by Symptom and based on symptoms appearing on the vehicle (symptoms obtained through steps of customer complaint analysis, trouble symptom confirmation and/or basic engine check) and repair or replace faulty parts, if any. Symptom Related Diagnostic Procedures

7. DIAGNOSTIC TROUBLE CODE FLOW CHART
Based on the DTC indicated in Step 5 and referring to "DIAGNOSTIC TROUBLE CODE FLOW CHART" in Trouble Code Diagnostic Procedures Testing and Inspection, locate the cause of the trouble, namely in a sensor, switch, wire harness, connector, actuator, ECM or other part and repair or replace faulty parts.

8. CHECK FOR INTERMITTENT PROBLEM
Check parts where an intermittent trouble is easy to occur (e.g., wire harness, connector, etc.), referring to "INTERMITTENT AND POOR CONNECTION". Standard Electrical Circuit Service and Inspection Procedures

9. FINAL CONFIRMATION TEST
Confirm that the problem symptom has gone and the engine is free from any abnormal conditions. If what has been repaired is related to the malfunction DTC, clear the DTC once and perform DTC confirmation procedure and confirm that no DTC is indicated.
Reading Diagnostic Trouble Codes
Clearing Diagnostic Trouble Codes