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.
Outline Of Diagnosis
Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
Judge as NG if there is exhaust gas temperature diagnosis and idle speed diagnosis and if either of them is NG.
- Exhaust gas temperature diagnosis
Judge as NG when the exhausted gas temperature in 14 seconds after the cold start is below the specified value.
- Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed after terminating the retard angle control.
Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
Judge as NG if there is intake air amount diagnosis and idle speed diagnosis and if either of them is NG.
- Intake air amount diagnosis
Judge as NG when intake air amount, which should be larger, is small during catalyst advanced idling retard angle control.
- Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed after terminating the retard angle control.
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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