Rodeo LS 4WD V6-3.2L (1998)
Engine Control Module: Description and Operation
Powertrain Control Module (PCM)
Description and Operation
DESCRIPTION
The powertrain control module (PCM) is located in the passenger compartment below the center console. The PCM controls the following:
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Fuel metering system.
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Transmission shifting (automatic transmission only)
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Ignition timing.
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On-board diagnostics for powertrain functions.
The PCM constantly observes the information from various sensors. The PCM controls the systems that affect vehicle performance. The PCM
performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the Check Engine lamp, and store
diagnostic trouble codes (DTCs). DTCs identify the problem areas to aid the technician in making repairs.
This engine uses 2 different control modules:
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IPCM-6KT for automatic transmission equipped vehicles.
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ISFI-6 for manual transmission equipped vehicles.
PCM Function
DESCRIPTION AND OPERATION
The PCM supplies either 5 or 12 volts to power various sensors or switches. The power is supplied through resistances in the PCM which are so
high in value that a test light will not light when connected to the circuit. In some cases, even an ordinary shop voltmeter will not give an accurate
reading because its resistance is too low. Therefore, a digital voltmeter with at least 10 megohms input impedance is required to ensure accurate
voltage readings. Tool J 39200 meets this requirement. The PCM controls output circuits such as the injectors, Idle Air Control (IAC), cooling fan
relays, etc., by controlling the ground or the power feed circuit through transistors or through either of the following two devices:
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Output Driver Module (0DM).
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Quad Driver Module (QDM).
PCM Components
DESCRIPTION AND OPERATION
The PCM is designed to maintain exhaust emission levels to government mandated standards while providing excellent driveability and fuel
