Esteem L4-1590cc 1.6L SOHC 0 MFI 16V (1995)
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When ECM detects a trouble which has occurred in the above areas, it makes malfunction indicator lamp ("CHECK ENGINE" light) turn ON
while the engine is running to warn the driver of such occurrence of trouble and at the same time it stores the trouble area in ECM back-up
memory. (The memory is kept as it is even if the trouble was only temporary and disappeared immediately. And it is not erased unless the
power to ECM is shut off for specified time below.) ECM also indicates trouble area in memory by means of flashing of malfunction indicator
lamp ("CHECK ENGINE" light) at the time of inspection (i.e. when diagnosis switch terminal is grounded and ignition switch is turned ON.)
NOTE:
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When a trouble occurs in the above areas except EGR system or fuel system and disappears soon while the diagnosis switch terminal is
ungrounded and the engine is running, malfunction indicator lamp ("CHECK ENGINE" light) lights and remains ON as long as the trouble
exists but it turns OFF when the normal condition is restored. When it is EGR system where a trouble occurs, even if it is only a temporary
one and disappears soon, malfunction indicator lamp ("CHECK ENGINE" light) remains ON till the ignition switch is turned OFF.
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Only ignition circuit trouble (code No.41) is not stored in back-up memory of ECM. (in other words, even if ECM has detected a trouble in
ignition circuit, once ignition switch is turned OFF, code No.41 will not be indicated even when diagnosis switch terminal is grounded and
ignition switch is turned ON.). Therefore, to check diagnostic trouble code when engine fails to start, crank engine and then ground
diagnostic switch terminal with ignition switch ON.
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Time required to erase diagnostic trouble code memory thoroughly varies depending on ambient temperature as follows.
Fail-safe function
Even when a trouble has occurred in such area of Electronic Fuel Injection system that includes the following parts and a failure signal is sent to
ECM, control over the injector, idle air control valve and others is maintained on the basis of the standard signals and/or back-up program
prestored in the ECM while ignoring that failure signal and/or CPU. This function is called "fail-safe function". Thus, with this function, a certain
level of engine performance is available even when some failure occurs in such area and disability in running is avoided.
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Engine coolant temp. sensor
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Throttle position sensor
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Vehicle speed sensor
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Intake air temp. sensor
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Manifold absolute pressure sensor
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CPU in ECM
Manifold Absolute Pressure Sensor (MAP Sensor)
This sensor senses pressure change in the intake manifold and converts it into voltage change. It consists of a semiconductor type pressure
converting element which converts a pressure change into an electrical change and an electronic circuit which amplifies and corrects the electric
change. The ECM sends a 5-volt reference voltage to the pressure sensor. As the manifold pressure changes, the electrical resistance of the sensor
