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 Troubleshoot
- Bring in the car
Next
- Interview and phenomenon check
Next
- Read DTC
- Check the DTC(s) related to engine and CAN communication system and the freeze frame data.
- When DTC is output or freeze frame data is displayed, store it.CAUTION: When clearing the DTC and/or freeze frame data, be sure to store the data before clearing it.
Result
Result Go to When DTC not related to CAN communication system is output. A When no DTC is output. B When DTC related to CAN communication system is output. C B: Go to Step 12.
C: Go to CAN communication article. (Refer to HOW TO TROUBLESHOOT )
A: Go to next step
- Check repeatability of malfunction
- Perform repeatability test, referring to the result of the interview.
Result
Result Go to When malfunction is repeated A When malfunction is not repeated B B: Go to Step 9.
A: Go to next step
- Perform repeatability test, referring to the result of the interview.
- List of diagnostic codes (main inspection parts) or troubleshooting for DTC
- System circuit inspection
- If the faulty parts are not specified after the diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
Next
- If the faulty parts are not specified after the diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
- Repair faulty points
Next
- Read DTC (Refer to CHECKING/CLEARING DTC
)
Next: Complete
- Inspection for problems that do not normally occur (Refer to CHECKING/CLEARING DTC
)
Next
- Repair faulty points
Next
- Read DTC (Refer to CHECKING/CLEARING DTC
)
Next: Complete
- Check repeatability of malfunction
- Perform repeatability test, referring to the result of the interview.
Result
Result Go to When malfunction is repeated A When malfunction is not repeated B B: Go to Step 19.
A: Go to next step
- Perform repeatability test, referring to the result of the interview.
- Symptom table
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
Result
Result Go to Faulty points are not determined. A Faulty points are determined. B B: Go to Step 17.
A: Go to next step
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
- Basic inspection
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
Result
Result Go to Faulty points are not determined. A Faulty points are determined. B B: Go to Step 17.
A: Go to next step
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
- Inspection with SSM3
- Check [Current Data Display & Save], and perform [System Operation Check Mode]. (Refer to CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE
)
Result
Result Go to Faulty points are not determined. A Faulty points are determined. B B: Go to Step 17.
A: Go to next step
- Check [Current Data Display & Save], and perform [System Operation Check Mode]. (Refer to CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE
)
- System circuit inspection
- If any defective point is not located in the areas outside of the engine control computer after diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
Next
- If any defective point is not located in the areas outside of the engine control computer after diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
- Repair faulty points
Next
- Check trouble phenomenon
- Perform driving test referring to the result of the interview, and check that the malfunction does not recur.
Next: Complete
- Perform driving test referring to the result of the interview, and check that the malfunction does not recur.
- Symptom table
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
Result
Result Go to Faulty points are not determined. A Faulty points are determined. B B: Go to Step 24.
A: Go to next step
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to SYMPTOM TABLE
)
- Basic inspection
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to BASIC INSPECTION
)
Result
Result Go to When faulty points are not determined. A When faulty points are determined. B B: Go to Step 24.
A: Go to next step
- Estimate the location of the faulty points from the result of the interview, and perform necessary inspection. (Refer to BASIC INSPECTION
)
- Inspection with SSM3
- Check [Current Data Display & Save], and perform [System Operation Check Mode]. (Refer to CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE
)
Result
Result Go to Faulty points are not determined. A Faulty points are determined. B B: Go to Step 24.
A: Go to next step
- Check [Current Data Display & Save], and perform [System Operation Check Mode]. (Refer to CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE
)
- System circuit inspection
- If any defective point is not located in the areas outside of the engine control computer after diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
Next
- If any defective point is not located in the areas outside of the engine control computer after diagnosis according to the inspection procedure, refer to the inspection method of the electrical circuit, and perform the circuit inspection again. (For system circuit figure, refer to CIRCUIT FIGURE
.)
- Inspection for problems that do not normally occur (Refer to CHECKING/CLEARING DTC
)
Next
- Repair faulty points
Next
- Check trouble phenomenon
- Perform driving test referring to the result of the interview, and check that the malfunction does not recur.
Next: Complete
- Perform driving test referring to the result of the interview, and check that the malfunction does not recur.
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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.
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