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
The hand-held tester can be used at step 3, 4, 5, 7 and 10.
- VEHICLE BROUGHT TO WORKSHOP
Go To Next step.
- CUSTOMER PROBLEM ANALYSIS (See CUSTOMER PROBLEM ANALYSIS CHECK
)
Go To Next step.
- CONNECT HAND-HELD TESTER TO DLC3
HINT:
If the display indicates a communication fault in the tester, inspect DLC3.
Go To Next step.
- CHECK DTC AND FREEZE FRAME DATA (See DTC CHECK/CLEAR
)
HINT:
Record or print DTCs and freeze frame data, if needed.
Go To Next step.
- CLEAR DTC AND FREEZE FRAME DATA (See DTC CHECK/CLEAR
)
Go To Next step.
- VISUAL INSPECTION
Go To Next step.
- SETTING CHECK MODE DIAGNOSIS (See CHECK MODE PROCEDURE
)
Go To Next step.
- PROBLEM SYMPTOM CONFIRMATION
HINT:
If the engine does not start, perform steps 10 and 12 first.
MALFUNCTION OCCURSMalfunction does not occur A Malfunction occurs B A: GO TO NEXT STEP
B: GO TO STEP 10
- SYMPTOM SIMULATION
Go To Next step.
- DTC CHECK (See DTC CHECK/CLEAR
) MALFUNCTION CODE
Malfunction code A No code B A: GO TO NEXT STEP
B: GO TO STEP 12
- DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART
)
GO TO STEP 14
Go To Next step.
- BASIC INSPECTION (See BASIC INSPECTION
) PARTS CONFIRMED
Wrong parts not confirmed A Wrong parts confirmed B A: GO TO NEXT STEP
B: GO TO STEP 17
- PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE
) PARTS & CIRCUIT CONFIRMED
Wrong circuit confirmed A Wrong parts confirmed B A: GO TO NEXT STEP
B: GO TO STEP 17
- CHECK ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT
)
Go To Next step.
- CIRCUIT INSPECTION MALFUNCTION CONFIRMED
Malfunction not confirmed A Malfunction confirmed B A: GO TO NEXT STEP
B: GO TO STEP 18
Go To Next step.
- CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS
)
GO TO STEP 18
Go To Next step.
- PARTS INSPECTION
Go To Next step.
- IDENTIFICATION OF PROBLEM
Go To Next step.
- ADJUSTMENT AND/OR REPAIR
Go To Next step.
- CONFIRMATION TEST
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.