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:
*: Use the Techstream.
- VEHICLE BROUGHT TO WORKSHOP
- CONNECT TECHSTREAM TO DLC3*
HINT:
If the display indicates a communication fault in the tester, inspect the DLC3.
- CHECK DTC AND FREEZE FRAME DATA*
HINT.
Record or print DTCs and freeze frame data, if necessary (See DTC CHECK/CLEAR ).
- CLEAR DTC AND FREEZE FRAME DATA*
HINT:
Refer to DTC CHECK/CLEAR (See .
- CONDUCT VISUAL INSPECTION
- SET CHECK MODE DIAGNOSIS*
HINT:
Refer to CHECK MODE PROCEDURE (See .
- CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, first perform the "check DTC" procedures and "conduct basic inspection" procedures below.
RESULT REFERENCEResult Proceed to Malfunction does not occur A Malfunction occurs B B: GO TO STEP 9
A: Go to next step
- SIMULATE SYMPTOMS
- CHECK DTC*
HINT:
Refer to DTC CHECK/CLEAR (See
RESULT REFERENCEResult Proceed to Malfunction code A No code B B: GO TO STEP 11
A: Go to next step
- REFER TO DTC CHART
HINT:
Refer to DIAGNOSTIC TROUBLE CODE CHART (See .
NEXT: GO TO STEP 13
- CONDUCT BASIC INSPECTION
HINT:
Refer to BASIC INSPECTION (See .
RESULT REFERENCEResult 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 (See .
RESULT REFERENCEResult 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 (See .
- CONDUCT CIRCUIT INSPECTION RESULT REFERENCE
Result 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 (See .
NEXT: GO TO STEP 17
- CONDUCT PARTS INSPECTION
- IDENTIFY PROBLEM
- ADJUST, REPAIR OR REPLACE
- CONDUCT CONFIRMATION TEST
NEXT: 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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