Toyota Corolla (E120): Problem symptoms table

The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to troubleshoot the problem when a normal code is displayed in the diagnostic trouble code chart but the problem is still occurring. Numbers in the table indicate the order in which the circuits or parts should be checked.

Hint: when the problem is not detected by the diagnostic system even though the problem symptom is present, it may be that the problem is occurring outside the detection range of the diagnostic system.

Circuit inspection

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    Doors
    Unlocking and locking the doors from the outside ■ Smart key system (if equipped) Carry the electronic key to enable this function. Grip the driver's door handle to unlock the door. Holding the driver's door handle for approximately 2 seconds unlocks all the doors. Grip the front passenger ...

    Circuit description
    When a misfire occurs in the engine, hydrocarbons (hc) enter the exhaust in high concentrations. If this hc concentration is high enough, there could be an increase in exhaust emissions levels. High concentrations of hc passing through the catalyst also cause to temperature of the catalyst to ...

    Air outlet layout and operations
    ■ Location of air outlets The air outlets and air volume changes according to the selected air flow mode. :If equipped ■ Adjusting the position of and opening and closing the air outlets Front center Direct air flow to the left or right, up or down Front right-hand side Direct air flow to th ...