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