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 intelligent tester can be used in steps 2, 3, 4, 6 and 9.
- VEHICLE BROUGHT TO WORKSHOP
- CONNECT INTELLIGENT TESTER TO DLC3
HINT:
If the display indicates a communication fault in the tester, inspect the DLC3.
- CHECK DTC AND FREEZE FRAME DATA
- Check for DTC(s) and freeze frame data (See FREEZE FRAME DATA
).
HINT:
Record or print the DTCs and freeze frame data, if necessary.
- Check for DTC(s) and freeze frame data (See FREEZE FRAME DATA
).
- CLEAR DTC AND FREEZE FRAME DATA
- Clear the DTC(s) and freeze frame data (See FREEZE FRAME DATA ).
- CONDUCT VISUAL INSPECTION
- SET CHECK MODE DIAGNOSIS
- Set the check mode (See CHECK MODE PROCEDURE ).
- CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, perform steps 9 and 11 first.
Result
RESULT CHARTResult Proceed to Malfunction does not occur A Malfunction occurs B B: GO TO STEP 9
A: Go to Next Step
- SIMULATE SYMPTOMS
- CHECK FOR DTCS
- Check for DTCs (See DTC CHECK/CLEAR
).
Result
RESULT CHARTResult Proceed to Trouble code A No code B
B: GO TO STEP 11
A: Go to Next Step
- Check for DTCs (See DTC CHECK/CLEAR
).
- REFER TO "DTC CHART"
HINT:
Refer to the DTC chart (See DIAGNOSTIC TROUBLE CODE CHART ).
GO TO STEP 13
- CONDUCT BASIC INSPECTION
HINT:
Refer to "BASIC INSPECTION "
Result
RESULT CHARTResult Proceed to Malfunctioning parts not confirmed A Malfunctioning parts confirmed B B: GO TO STEP 16
A: Go to Next Step
- REFER TO "PROBLEM SYMPTOMS TABLE"
HINT:
Refer to "PROBLEM SYMPTOMS TABLE "
Result
RESULT CHARTResult Proceed to Malfunctioning circuit confirmed A Malfunctioning parts confirmed B B: GO TO STEP 16
A: Go to Next Step
- CHECK ECM POWER SOURCE CIRCUIT
HINT:
Refer to "ECM POWER SOURCE CIRCUIT "
- CONDUCT CIRCUIT INSPECTION
Result
RESULT CHARTResult Proceed to Malfunction not confirmed A Malfunction confirmed B B: GO TO STEP 17
A: Go to Next Step
- CHECK FOR INTERMITTENT PROBLEMS
HINT:
Refer to "CHECK FOR INTERMITTENT PROBLEMS "
GO TO STEP 17
- CONDUCT PARTS INSPECTION
- IDENTIFY PROBLEM
- ADJUST AND/OR REPAIR
- CONDUCT 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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