Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Detailed Flow
- GET INFORMATION ABOUT SYMPTOM
Get detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurs).
GO TO 2.
- CHECK DTC
- Check DTC of "ENGINE", "BCM" and "IPDM E/R" using CONSULT-III.
- Perform the following procedure if DTC is detected.
- Record DTC and freeze frame data (Print them out using CONSULT-III.)
- Erase DTC.
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
- Check related service bulletins for information.
Are any symptoms described and any DTC detected?
Symptom is described, DTC is detected: GO TO 3.
Symptom is described, DTC is not detected: GO TO 4.
Symptom is not described, DTC is detected: GO TO 5.
- CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle, and check self diagnostic results in real time.
Verify relation between the symptom and the condition when the symptom is detected.
GO TO 5.
- CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle, and check self diagnostic results in real time.
Verify relation between the symptom and the condition when the symptom is detected.
GO TO 6.
- PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC Confirmation Procedure for the detected DTC, and then check that DTC is detected again.
At this time, always connect CONSULT-III to the vehicle, and check self diagnostic results in real time.
If two or more DTCs are detected, refer to "DTC INSPECTION PRIORITY CHART " (BCM) or "DTC INDEX " (IPDM E/R), and determine trouble diagnosis order.
Is DTC detected?
YES: GO TO 7.
NO: Refer to "INTERMITTENT INCIDENT ".
- DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS
Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.
GO TO 7.
- DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE: The Diagnostic Procedure is described based on open and short circuit inspection.Is malfunctioning part detected?
YES: GO TO 8.
NO: Check voltage of related BCM terminals or IPDM E/R terminals using CONSULT-III.
- REPAIR OR REPLACE THE MALFUNCTIONING PART
- Repair or replace the malfunctioning part.
- Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replacement.
- Check DTC. If DTC is detected, erase it.
GO TO 9.
- FINAL CHECK
When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the malfunction is repaired securely.
When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the symptom is not detected.
Does the symptom reappear?
YES (DTC is detected): GO TO 7.
YES (Symptom remains): GO TO 6.
NO: INSPECTION END
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.