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.
DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- OUTLINE OF DIAGNOSISÂ
Judge NG when SUM value of ROM is out of the standard value.
- ENABLE CONDITIONÂ SECONDARY PARAMETERS AND ENABLE CONDITION CHART
Secondary Parameters Enable Conditions Ignition switch ON - GENERAL DRIVING CYCLEÂ
Always perform the diagnosis continuously.
- DIAGNOSTIC METHODÂ
- Abnormality JudgmentÂ
Judge NG when the continuous time of completing the malfunction criteria below becomes more than 0.5 seconds.
Judgment ValueÂ
MALFUNCTION CRITERIA AND THRESHOLD VALUE CHARTMalfunction Criteria Threshold Value SUM value of ROM Standard value Time Needed for Diagnosis:Â 0.5 seconds
Malfunction Indicator Light Illumination:Â Illuminates as soon as malfunction occurs.
- Abnormality JudgmentÂ
- DTC CLEAR CONDITIONÂ
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed (Only at engine stop)
- MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONÂ
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
- FAIL SAFEÂ
Stop the current to electric control throttle motor. (Fix the throttle opening angle to 6°.)
- ECM OPERATION AT DTC SETTINGÂ
- Memorize the freeze frame data. (For test mode $02)
- Memorize the diagnosis value and malfunction criteria value. (For test mode $06)
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.