Dakota 4WD V6-239 3.9L Magnum (1996)
Task Manager
The Task Manager controls the execution of some component/systems tests, control of MIL illumination, storage of fault codes, and storage of
vehicle data at time of fault detection (freeze frame). This routine performs the following monitoring requirements:
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Fuel System Monitoring
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Misfire Detection
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EGR System Monitor
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Oxygen Sensor Upstream Heater Monitor
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Oxygen Sensor Upstream Monitor
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Evaporative System Monitor
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Catalyst Monitor
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Purge Flow Monitor
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02 Heater Downstream Monitor
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02 Sensor Downstream Monitor
Another function of the task manager is control of the Disable Tables. These tables are used to discontinue testing when a condition specified
in the tables are met. Testing of a component or system is disabled if a fault or failure occurs which would render the test useless. (For
example, the "Catalyst Monitor" test will not be run unless the "O2 Sensor" test has passed.)
Comprehensive Component Manager
The Comprehensive Component Manager controls the testing of all powertrain components/ systems which can affect emissions and were not
otherwise tested by the Task Manager. This routine is organized into three areas:
D3 and K4 CIRCUIT CHECKS - Performed on sensor inputs connected to the D3 and K4 to determine out-of-range or high/flow input
conditions. Performed on outputs to check for open/short conditions. The components tested are:
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Idle Air Control (IAC) Open/Short Circuit
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Generator Field
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Torque Converter Clutch (TCC) Solenoid
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Fan Relay
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A/C Relay
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Air Switch / Shift Lock Solenoid
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Transmission Relay Output
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Automatic Shutdown (ASD) Relay
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Fuel Pump Relay
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EVAP Purge Solenoid
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EGR Solenoid
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Ignition Coils
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Injector Failure
Z2 CIRCUIT CHECKS - Performed on sensor inputs connected to the Z2 to determine out-of-range or high/low input conditions. Performed
on outputs to check for open/short conditions. The components tested are:
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MAP Sensor Voltage (high/low)
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Intake Air Temperature (IAT) Sensor Voltage (high/low)
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Engine Coolant Temperature (ECT) Sensor Voltage (high/low)
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Throttle Position Sensor (TPS) Voltage (high/low)
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Manifold Absolute Pressure (MAP) Sensor 5 Volt Supply Check
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Compressed Natural Gas (CNG) Pressure Sensor Voltage (high/low)
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CNG Temperature Sensor Voltage (high/low)
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Battery Temperature Sensor Voltage (high/low)
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Fuel Level Sensor Voltage (high/low)
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Transmission Temperature Sensor Voltage (high/low)
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Governor Pressure Sensor Voltage (high/low)
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Governor Pressure Solenoid (open/short)
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ASD Relay Voltage (out of range)
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Battery Voltage (too high)
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Overdrive Override Switch (fault)
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Leak Detection Pump Solenoid (open/short)
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3/4 Shift Solenoid (open/short)
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Speed Control Vacuum and Vent Solenoids (open/short)
FUNCTIONALITY/RATIONALITY CHECKS - These tests determine if a component is working correctly through methods other than
voltage limit tests and open/short tests. Solenoids in this section are checked for proper operation (functionality) and sensors are checked for
meaningful output values (rationality). The components/systems checked are:
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Cam Sensor Pulses Present
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Crank Sensor Pulses Present
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MAP Sensor Output in Range
