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Toyota 22R-E - Page 439

Toyota 22R-E
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The control system consists of sensors which detect various engine conditions, and an ECM
which determines the injection volume (timing) based on the signals from the sensors.
The various sensors detect the intake air volume, engine speed, oxygen density in the exhaust
gas, engine coolant temperature, intake air temperature and atmospheric pressure etc. and
convert the information into an electrical signal which is sent to the ECM. Based on these signals,
the ECM calculates the optimum ignition timing for the current conditions and operates the
injectors.
The ECM not only controls the fuel injection timing, but also the self diagnostic function which
records the occurrence of a malfunction, ignition timing control, idle speed control, fuel pressure
control and fuel pump control.
ELECTRONIC CONTROL SYSTEM
ENGINE MFI SYSTEM
EG2–162

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