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.
PROBLEM SYMPTOMS MALFUNCTION RESULT REFERENCEResult 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
- 10 CHECK DTC (See
DTC CHECK/CLEAR ) DTC CHECK/CLEAR MALFUNCTION RESULT REFERENCE
Result Proceed To Malfunction code A No code B - B: GO TO STEP 12 .
- A: GO TO NEXT STEP
- REFER TO DTC CHART (See
DIAGNOSTIC TROUBLE CODE CHART )
- GO TO STEP 14 .
- CONDUCT BASIC INSPECTION (See
BASIC INSPECTION ) BASIC INSPECTION MALFUNCTION RESULT REFERENCE
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 (See
PROBLEM SYMPTOMS TABLE ) PROBLEM SYMPTOMS MALFUNCTION RESULT REFERENCE
Result Proceed To Malfunctioning circuit confirmed A Malfunctioning parts confirmed B - B: GO TO STEP 17 .
- A: GO TO NEXT STEP
- 14 CHECK ECM POWER SOURCE CIRCUIT (See
ECM POWER SOURCE CIRCUIT )
- GO TO NEXT STEP
- CONDUCT CIRCUIT INSPECTION CONDUCT CIRCUIT MALFUNCTION RESULT REFERENCE
Result Proceed To Malfunction not confirmed A Malfunction confirmed B - B: GO TO STEP 18 .
- A: GO TO NEXT STEP
- CHECK FOR INTERMITTENT PROBLEMS (See
CHECK FOR INTERMITTENT PROBLEMS )
- GO TO STEP 18 .
- CONDUCT PARTS INSPECTION
- GO TO NEXT STEP
- 18 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.
