Engine Diagnostic Flow Table

Steps 1 - 11:

Refer to the following for the details of each 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 to the point required for proper analysis and diagnosis.

Customer Problem Inspection Form (Example):

2. DIAGNOSTIC TROUBLE CODE (DTC)/FREEZE FRAME DATA CHECK, RECORD AND CLEARANCE
First, check DTC (including pending DTC), referring to How to Display and Read Diagnostic Trouble Codes. If DTC is indicated, print it and freeze frame data or write them down and then clear them by referring to How to Clear Diagnostic Trouble Codes. 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 5 and recheck DTC according to Step 6 and 7.

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 Table.
- If only automatic transmission DTC P0705 to P0758, or P1875 is indicated in this step, proceed to DIAGNOSIS.

3. VISUAL INSPECTION ( Applicable to step 4 also )
As a preliminary step, be sure to perform visual check of the items that support proper function of the engine referring to "Visual Inspection".

5. 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 DTC Diagnosis.

6. DTC/FREEZE FRAME DATA RECHECK, RECORD AND CLEARANCE ( Applicable to step 7 also )
Refer to "DTC CHECK" for checking procedure.

8. ENGINE BASIC CHECK AND SYMPTOMS-TO-DIAGNOSIS MATRIX TABLE
Perform basic engine check according to the "Engine Basic Check Flow Table" first. When the end of the flow table has been reached, check the parts of the system suspected as a possible cause referring to Diagnosis By Symptom; Symptoms- to-Diagnosis Matrix Table, 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.

9. TROUBLESHOOTING FOR DTC (See each DTC Diag. Flow Table)
Based on the DTC indicated in Step 6 or 7 and referring to the applicable DTC diag. flow table, locate the cause of the trouble, namely in a sensor, switch, wire harness, connector, actuator, ECM (PCM) or other part and repair or replace faulty pants.

10. 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" in Overall Vehicle Information / Testing and Inspection and related circuit of DTC recorded in Step 2.

11. 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 DTC, clear the DTC once and perform DTC confirmation procedure and confirm that no DTC is indicated.