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.
- VEHICLE BROUGHT TO WORKSHOP
NEXT
- CUSTOMER PROBLEM ANALYSIS
NEXT
- CONNECT INTELLIGENT TESTER TO THE 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
NEXT
- SET CHECK MODE DIAGNOSIS*
NEXT
- CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, perform steps 10 and 12 first.
RESULT PROCEDURE CHARTResult Proceed to Malfunction does not occur A Malfunction occurs B B : GO TO STEP 10
A : GO TO NEXT STEP.
- SIMULATE SYMPTOMS
NEXT
- CHECK DTC* RESULT PROCEDURE 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
GO TO STEP 14
- CONDUCT BASIC INSPECTION RESULT PROCEDURE 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 PROCEDURE 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 RESULT PROCEDURE 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
GO TO STEP 18
- CONDUCT PARTS INSPECTION
NEXT
- IDENTIFY PROBLEM
NEXT
- ADJUST, REPAIR OR REPLACE
- 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.
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