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 Techstream.
- VEHICLE BROUGHT TO WORKSHOP
- CUSTOMER PROBLEM ANALYSIS
- CONNECT TECHSTREAM TO DLC3*
HINT:
If the display indicates a communication fault in the tester, inspect the DLC3.
- CHECK DTC AND FREEZE FRAME DATA*
HINT:
Record or print DTCs and freeze frame data, if needed.
- CLEAR DTC AND FREEZE FRAME DATA*
- VISUAL INSPECTION
- SETTING CHECK MODE DIAGNOSIS*
- PROBLEM SYMPTOM CONFIRMATION
If the engine does not start, first perform the "CHECK DTC" procedures and "CONDUCT BASIC INSPECTION" procedures below.
MALFUNCTION CHARTMalfunction does not occur A Malfunction occurs B B: GO TO STEP 10
A: Go To Next Step
- SYMPTOM SIMULATION
- DTC CHECK* TROUBLE CODE REFERENCE CHART
Trouble code A No code B B: GO TO STEP 12
A: Go To Next Step
- DTC CHART
NEXT: GO TO STEP 14
- BASIC INSPECTION WRONG PARTS REFERENCE
Wrong parts not confirmed A Wrong parts confirmed B B: GO TO STEP 17
A: Go To Next Step
- PERFORM SYMPTOMS TABLE SYMPTOMS REFERENCE
Wrong circuit confirmed A Wrong parts confirmed B B: GO TO STEP 17
A: Go To Next Step
- CHECK ECM POWER SOURCE CIRCUIT
- CIRCUIT INSPECTION MALFUNCTION REFERENCE
Malfunction not confirmed A Malfunction confirmed B B: GO TO STEP 18
A: Go To Next Step
- CHECK FOR INTERMITTENT PROBLEMS
NEXT: GO TO STEP 18
- PARTS INSPECTION
- IDENTIFICATION OF PROBLEM
- ADJUSTMENT AND/OR REPAIR
- 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.
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