Rodeo S 2WD L4-2.2L (1999)
Ignition Control Module: Description and Operation
Ignition Control Module (ICM)
The ignition control (IC) spark timing is the PCM's method of controlling the spark advance and the ignition dwell.
The IC spark advance and the ignition dwell are calculated by the PCM using the following inputs:
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Engine speed.
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Crankshaft position (58X reference).
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Camshaft position (CMP) sensor.
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Engine coolant temperature (ECT) sensor.
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Throttle position (TP) sensor.
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Vehicle speed (vehicle speed sensor).
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PCM and ignition system supply voltage.
The powertrain control module (PCM) controls engine ignition through a solid-state switching unit called the ignition control module (1CM). The
software in the PCM uses input from several sensors to determine the timing, duration, and strength of the spark.
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The crankshaft position (CKP) sensor sends the PCM a 58X signal related to the exact position of the crankshaft.
