Axiom 2WD V6-3.5L (2002)
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Quad Driver Module (QDM)
PCM Voltage Description
The PCM supplies a buffered voltage to various switches and sensors. It can do this because resistance in the PCM is so high in value that a test light
may not illuminate when connected to the circuit.An ordinary shop voltmeter may not give an accurate reading because the voltmeter input impedance is
too low. Use a 10-megohm input impedance digital voltmeter (such as J 39200) to assure accurate voltage readings.
The input/output devices in the PCM include analog-to-digital converters, signal buffers, counters, and special drivers. The PCM controls most
components with electronic switches which complete a ground circuit when turned "ON."These switches are arranged in groups of 4 and 7, called either
a surface-mounted quad driver module (QDM), which can independently control up to 4 output terminals, or QDMs which can independently control up
to 7 outputs. Not all outputs are always used.
PCM Inputs/Outputs
Inputs - Operating Conditions Read
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Air Conditioning "ON" or "OFF"
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Engine Coolant Temperature
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Crankshaft Position
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Exhaust Oxygen Content
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Electronic Ignition
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Manifold Absolute Pressure
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Battery Voltage
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Throttle Position
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Vehicle Speed
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Fuel Pump Voltage
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Power Steering Pressure
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Intake Air Temperature
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Mass Air Flow
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Engine Knock
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Acceleration Position
Outputs - Systems Controlled
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EVAP Canister Purge
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Exhaust Gas Recirculation (EGR)
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Ignition Control
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Fuel Control
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ION Sensing Module
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Electric Fuel Pump
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Air Conditioning
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Diagnostics
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Malfunction Indicator Lamp
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Data Link Connector (DLC)
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Data Output
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Transmission Control Module