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 [03/2023 - ]: Procedure
- VEHICLE BROUGHT TO WORKSHOP
Result
Proceed to NEXT Result:
NEXT
See step 2
- CUSTOMER PROBLEM ANALYSIS
Result
Proceed to NEXT Result:
NEXT
See step 3
- PRE-CHECK
- Measure the auxiliary battery voltage.
Standard voltage
12 V or higher (ignition switch off)
HINT:
If the auxiliary battery voltage is below 12 V, recharge or replace the auxiliary battery.
- 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 auxiliary battery voltage.
- CHECK CAN COMMUNICATION SYSTEM*
- Using the GTS, check if the CAN communication system is functioning normally.
HINT:
Refer to Communication Bus Check in CAN Communication System.
- for HEV Model:
Refer to DIAGNOSIS SYSTEM [12/2022 - ]
- for PHEV Model:
Refer to DIAGNOSIS SYSTEM [03/2023 - ]
OK
CAN communication system is functioning normally.
Result
Proceed to OK NG - for HEV Model:
Result:
NG
GO TO CAN COMMUNICATION SYSTEM
- for HEV Model:
- for PHEV Model:
Result:
OK
See step 5
- Using the GTS, check if the CAN communication system is functioning normally.
- CHECK FOR DTC*
- Check and record DTCs and Freeze Frame Data.
Body Electrical > Sub Battery System > Trouble Codes
- If the DTCs is output, record it.
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 [03/2023 - ]
Result:
A
See step 6
- Check and record DTCs and Freeze Frame Data.
- CHECK VEHICLE CONTROL HISTORY (RoB)*
- Check and record Vehicle Control History (RoB).
Body Electrical > Sub Battery System > Utility
Tester Display Vehicle Control History (RoB) - If the vehicle control history is output, record it.
Result
Result Proceed to RoBs are not output A RoBs are output. B
Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2022 - ]
Result:
B
GO TO VEHICLE CONTROL HISTORY (ROB). Refer to VEHICLE CONTROL HISTORY (RoB) [12/2022 - ]
- Check and record Vehicle Control History (RoB).
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.