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 AND SYMPTOM CHECK
Result
Proceed to NEXT Result:
NEXT
See step 3
- INSPECT BATTERY VOLTAGE
- 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.
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Measure the battery voltage.
- INSPECT CAN COMMUNICATION SYSTEM*
- Use the Techstream, check if the CAN communication system is functioning normally.
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 communication system DTCs are not output A CAN communication system 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
- Use the Techstream, check if the CAN communication system is functioning normally.
- CHECK FOR DTC*
- Check for DTCs and note any codes that are output.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Body Electrical > ASC > Trouble Codes
- Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Body Electrical > ASC > Clear DTCs
- Recheck for DTCs. Try to reproduce the ASC system DTCs by duplicating the conditions indicated by the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Body Electrical > ASC > Trouble Codes
Result
Result Proceed to DTCs are not output A DTCs are output B
Result:
B
GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2014 - 10/2022] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ]
Result:
A
See step 6
- Check for DTCs and note any codes that are output.
- PROBLEM SYMPTOMS TABLE
- Refer to Problem Symptoms Table.
Refer to PROBLEM SYMPTOMS TABLE [09/2014 - ]
Result
Result Proceed to Fault is not listed in Problem Symptoms Table A Fault is listed in Problem Symptoms Table B
Result:
B
GO TO PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [09/2014 - ]
Result:
A
See step 7
- Refer to Problem Symptoms Table.
- OVERALL ANALYSIS AND TROUBLESHOOTING*
- Operation Check
Refer to OPERATION CHECK [09/2014 - 11/2017] , or refer to OPERATION CHECK [11/2017 - ]
- Terminals of ECU
Refer to TERMINALS OF ECU [09/2014 - ]
- Data List / Active Test
Refer to DATA LIST / ACTIVE TEST [09/2014 - 11/2017] , or refer to DATA LIST / ACTIVE TEST [11/2017 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 8
- Operation Check
- ADJUST, REPAIR OR REPLACE
Result
Proceed to NEXT Result:
NEXT
See step 9
- CONFIRMATION TEST
Result
Proceed to NEXT Result:
NEXT
END
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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.