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.
How To Proceed With Troubleshooting [09/2014 - ]: Procedure
- VEHICLE BROUGHT TO WORKSHOP
Result
Proceed to NEXT Result:
NEXT
See step 2
- CUSTOMER PROBLEM ANALYSIS
HINT:
- In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
- The following 5 items are important points for problem analysis:
What Vehicle model, system name When Date, time, occurrence frequency Where Road conditions Under what conditions? Driving conditions, weather conditions How did it happen? Problem symptoms Result
Proceed to NEXT Result:
NEXT
See step 3
- PRE-CHECK
- Measure the battery voltage.
Standard Voltage
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
- Check the fuses and relays.
- Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Measure the battery voltage.
- CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
- Using the Techstream, check for CAN communication system DTCs.
Refer to DIAGNOSIS SYSTEM [09/2014 - 10/2015] , or refer to DIAGNOSIS SYSTEM [10/2015 - 08/2016] , or refer to DIAGNOSIS SYSTEM [08/2016 - 11/2017] , or refer to DIAGNOSIS SYSTEM [11/2017 - 10/2018] , or refer to DIAGNOSIS SYSTEM [10/2018 - 11/2019] , or refer to DIAGNOSIS SYSTEM [11/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - ]
Result
Result Proceed to CAN DTCs are not output A CAN DTCs are output B
Result:
B
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ]
Result:
A
See step 5
- Using the Techstream, check for CAN communication system DTCs.
- CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*
- Using the Techstream, check for LIN communication system DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Result
Result Proceed to LIN DTCs are not output A LIN DTCs are output B
Result:
B
GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]
Result:
A
See step 6
- Using the Techstream, check for LIN communication system DTCs.
- OVERALL ANALYSIS AND TROUBLESHOOTING*
- Terminals of ECU
Refer to TERMINALS OF ECU [09/2014 - 10/2022] , or refer to TERMINALS OF ECU [10/2022 - ]
- Data List / Active Test
Refer to DATA LIST / ACTIVE TEST [09/2014 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 7
- Terminals of ECU
- REPAIR OR REPLACE
Result
Proceed to NEXT Result:
NEXT
See step 8
- CONFIRMATION TEST
Result
Proceed to NEXT Result:
NEXT
END
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.