Dakota 4WD V6-239 3.9L Magnum (1996)
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Coolant Temperature in Range
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Throttle Position Sensor in Range
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Vehicle Speed Sensor Output Correct
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Park/Neutral Switch Working
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Fuel Level Sensor Output Correct
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Transmission Temperature Sensor Output Correct
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Transmission Governor Pressure in Range
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Output Shaft Speed Sensor Output Correct
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AIS Motor Working
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Lock-up Solenoid Working
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3/4 Shift Solenoid Working
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Governor Pressure Solenoid Working
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O2 Sensor 1/1 Output Voltage Low
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O2 Sensor 1/2 Output Voltage Low
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O2 Sensor 2/1 Output Voltage Low
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O2 Sensor 2/2 Output Voltage Low
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Charging System Working
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Power Steering Switch Working
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Thermostat Working
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O2 Sensor 1/1 (open circuit or high voltage)
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O2 Sensor 1/2 (open circuit or high voltage)
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O2 Sensor 2/1 (open circuit or high voltage)
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O2 Sensor 2/2 (open circuit or high voltage)
Cruise Control
CRUISE CONTROL
The Powertrain Control Module (PCM) controls vehicle speed by operation of the speed control servo vacuum and vent solenoids. Energizing the
vacuum solenoid applies vacuum to the servo to increase throttle position. Operation of the vent solenoid slowly releases the vacuum allowing
throttle position to decrease. A special dump solenoid allows immediate release of throttle position caused by braking, cruise control turn off, or
ignition key off.
Exhaust Gas Recirculation
EXHAUST GAS RECIRCULATION
The Powertrain Control Module (PCM) controls a solenoid which enables/disables EGR. Control of exhaust gas recirculation (using exhaust gas
pressure to modulate the vacuum supply to the EGR valve) is enabled only after the engine has warmed.
Fuel Vapor Recovery System
FUEL VAPOR RECOVERY SYSTEM (DUTY CYCLE PURGE CONTROL)
Duty Cycle Purge is a system that feeds fuel gases from the purge canister and gasoline tank into the throttle body for mixing with incoming air.
Metering of the gases is performed by duty cycling the purge solenoid by the Powertrain Control Module (PCM).
The system is disabled during wide open throttle conditions and while the engine is below a specified coolant temperature. When engine
temperature becomes greater than a calibrated parameter, duty cycle purge is delayed for a calibrated time. Once purge delay is over, purge will be
ramped in to soften the effect of dumping additional fuel into the engine.
The PCM provides a modulated 5 Hz signal (at closed throttle) or 10 Hz signal (at open throttle) to control this system. Modulation of the signal is
based upon a calculated air flow (based upon known fuel flow through the injector at a given pulse width and RPM) and is adjusted to compensate
for changes in flow due to varying engine vacuum.
Overview
OVERVIEW
The Powertrain Control Module (PCM) features a multi-processor environment (one 16 bit microcomputer, two 8 bit micro-computers) allowing
parallel processing of time critical operations. Dedication of one 8 bit processor (K4) to spark control and the other 8 bit processor (D3) to fuel
control allows increases in throughput and reduced software complexity in the 16 bit microcomputer (Z2). The result is increased capability in the
Z2 to handle overall strategy implementation, OBDII, and other computation-intensive processes. This approach allows control of up to a ten
cylinder engine running in excess of 6,500 RPM.
Spark Control
SPARK CONTROL
The K4 microcomputer controls the generation and timing of spark pulses. The spark advance and dwell characteristics are determined by: engine
speed, throttle position, MAP, coolant temperature, barometric air pressure, air temperature, and vehicle speed.
Transmission Control
