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
HINT:
*: Use the Intelligent tester or Techstream.
- VEHICLE BROUGHT TO WORKSHOP
NEXT
- CUSTOMER PROBLEM ANALYSIS
NEXT
- CONNECT INTELLIGENT TESTER OR TECHSTREAM TO DLC3
HINT:
If the display indicates a communication fault in the tester, inspect the DLC3.
NEXT
- CHECK DTC AND FREEZE FRAME DATA*
HINT:
Record or print DTCs and freeze frame data, if necessary.
NEXT
- CLEAR DTC AND FREEZE FRAME DATA*
NEXT
- CONDUCT VISUAL INSPECTION
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- SET CHECK MODE DIAGNOSIS*
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- CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, first perform the "CHECK DTC" procedures and "CONDUCT BASIC INSPECTION" procedures below.
PROBLEM SYMPTOMSResult Proceed to Malfunction does not occur A Malfunction occurs B B: GO TO STEP 10
A: GO TO NEXT STEP
- SIMULATE SYMPTOMS
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- CHECK DTC* DTC RESULT CHART
Result Proceed to Malfunction code A No code B B: GO TO STEP 12
A: GO TO NEXT STEP
- REFER TO DTC CHART
NEXT
- CONDUCT BASIC INSPECTION BASIC INSPECTION RESULT CHART
Result Proceed to Malfunctioning parts not confirmed A Malfunctioning parts confirmed B B: GO TO STEP 17
A: GO TO NEXT STEP
- REFER TO PROBLEM SYMPTOMS TABLE RESULT CHART
Result Proceed to Malfunctioning circuit confirmed A Malfunctioning parts confirmed B B: GO TO STEP 17
A: GO TO NEXT STEP
- CHECK ECM POWER SOURCE CIRCUIT
NEXT
- CONDUCT CIRCUIT INSPECTION CIRCUIT INSPECTION RESULT CHART
Result Proceed to Malfunction not confirmed A Malfunction confirmed B B: GO TO STEP 18
A: GO TO NEXT STEP
- CHECK FOR INTERMITTENT PROBLEMS
NEXT
- CONDUCT PARTS INSPECTION
NEXT
- IDENTIFY PROBLEM
NEXT
- ADJUST AND/OR REPAIR
NEXT
- CONDUCT CONFIRMATION TEST
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.