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 in steps 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 the 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 necessary.
- GO TO NEXT STEP
- CLEAR DTC AND FREEZE FRAME DATA (See DTC CHECK/CLEAR
)
- GO TO NEXT STEP
- CONDUCT VISUAL INSPECTION
- GO TO NEXT STEP
- SET CHECK MODE DIAGNOSIS (See CHECK MODE PROCEDURE
)
- GO TO NEXT STEP
- CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, perform steps 10 and 12 first.
CONFIRM PROBLEMResult Proceed To Malfunction does not occur A Malfunction occurs B - B : Go to STEP 10
- A : GO TO NEXT STEP
- SIMULATE SYMPTOM
- GO TO NEXT STEP
- CHECK DTC (See DTC CHECK/CLEAR
) MALFUNCTION
Result Proceed To Malfunction code A No code B - B: Go to STEP 12
- A: Go to next STEP
- REFER TO DIAGNOSTIC TROUBLE CODE TABLE
- NEXT: GO TO STEP 14
- CONDUCT BASIC INSPECTION CONDUCT BASIC INSPECTION
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 PROBLEM SYMPTOM
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
- GO TO NEXT STEP
- CONDUCT CIRCUIT INSPECTION CONDUCT CIRCUIT INSPECTION
Result Proceed To Malfunction not confirmed A Malfunction confirmed B - B: Go to STEP 18
- A: GO TO NEXT STEP
- (See CHECK FOR INTERMITTENT PROBLEMS
)
- NEXT: GO TO STEP 18
- CONDUCT PARTS INSPECTION
- GO TO NEXT STEP
- IDENTIFY PROBLEM
- GO TO NEXT STEP
- ADJUST AND/OR REPAIR
- GO TO NEXT STEP
- CONDUCT CONFIRMATION TEST
- END
Use the Manual With the Right Hardware
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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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