Work Flow

Work Flow:

WORK FLOW & STEP DESCRIPTIONS

STEP I
Get detailed information about the conditions and the environment when the incident/symptom occurred using a "DIAGNOSTIC WORK SHEET".

STEP II
Before confirming the concern, check and write down (print out using CONSULT or Generic Scan Tool) the (1st trip) Diagnostic Trouble Code (DTC) and the (1st trip) freeze frame data.
Reading Diagnostic Trouble Codes

Then erase the codes and the data.
Clearing Diagnostic Trouble Codes

The (1st trip) DTC and the (1st trip) freeze frame data can be used when duplicating the incident at STEP III & IV.
Study the relationship between the cause, specified by (1st trip) DTC, and the symptom described by the customer. (The "Symptom Matrix Charts" shown below, will be useful.)

(Part 1) Symptom Matrix Chart:

(Part 2) Symptom Matrix Chart:

(Part 3) Symptom Matrix Chart:

Also check for related service bulletins.

STEP III
Try to confirm the symptom and under what conditions the incident occurs.
The "DIAGNOSTIC WORK SHEET" and the freeze frame data are useful to verify the incident. Connect CONSULT to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results. If the incident cannot be verified, perform INCIDENT SIMULATION TESTS.

If the malfunction code is detected, skip STEP IV and perform STEP V.

STEP IV
Try to detect the (1st trip) Diagnostic Trouble Code by driving in (or performing) the "DTC CONFIRMATION PROCEDURE". Check and read the (1st trip) DTC and (1st trip) freeze frame data by using CONSULT or Generic Scan Tool.
During the (1st trip) DTC verification, be sure to connect CONSULT to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform INCIDENT SIMULATION TESTS.
In case the "DTC CONFIRMATION PROCEDURE" is not available, perform the "OVERALL FUNCTION CHECK" instead. The (1st trip) DTC cannot be displayed by this check, however, this simplified "check" is an effective alternative.
The "NG" result of the "OVERALL FUNCTION CHECK" is the same as the (1st trip) DTC detection.

STEP V
Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
Testing and Inspection

If the normal code is indicated, proceed to the BASIC INSPECTION.
Basic Inspection

Then perform inspections according to the Symptom Matrix Chart.
Symptom Related Diagnostic Procedures

STEP VI
Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the system for mechanical binding, loose connectors or wiring damage using (tracing) "Harness Layouts".
Gently shake the related connectors, components or wiring harness with CONSULT set in "DATA MONITOR (AUTO TRIG)" mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT.

Repair or replace the malfunctioning parts.

STEP VII
Once you have repaired the circuit or replaced a component. you need to run the engine in the same conditions and circumstances which resulted in the customer's initial complaint.
Perform the "DTC CONFIRMATION PROCEDURE" and confirm the normal code [Diagnostic trouble code No. P0000 or 0505] is detected. If the incident is still detected in the final check, perform STEP VI by using a different method from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st trip) DTC in ECM and A/T control unit. Clearing Diagnostic Trouble Codes