I believe 12v is supplied to the powertrain control module pcm from two sources a relay and the ignition switch. The ecm directly controls the generator field control circuit input to the generator. The voltage regulator portion of the pcm switches the field current on and off at a. Intelligent charging for the vehicle electrical system. A circuit in the pcm cycles the ground side of the generator field up to 100 times per second 100hz, but has the capability to ground the field control wire 100% of the time full field to achieve the target voltage. The computer controls outputs like the injectors, fans, solenoids, and relays to operate the various components. Gen iii pcms have the ability to control generator load on the engine through a turnon signal output. P0622 generator field f control circuit malfunction. This transistor grounds the ac generators field to control output voltage. In addition, some vehicles use a generator field duty cycle signal input to the pcm to monitor the duty cycle onoff of the generator.
The user can configure the pcm format to be generated. Evr circuitry is connected in series with the generator field driver terminal and ground. The pcm controls the ground side of the alternator rotor field circuit. This allow the pcm to adjust the idle speed to compensate for high electrical loads. The voltage regulator portion of the pcm switches the field current on and off at a frequency of about 400 times per second. Using an external ohmmeter, check for resistance in field driver circuit alternator harness terminal and cavity no. A high side driver within the pcm allows the pcm to turn the generator on and off. The pcm determines the engine operation and electrical load conditions based on the input signals from each control part and controls the energization time of the generator field coils. A circuit in the pcm cycles the ground side of the generator field up to 250 times per second 250hz, but has the capability to ground the field control wire 100% of the time full field to achieve the target voltage. The engine is a 2008 cadillac lc3 using an e67 pcm and the. General motors cs series generators may be connected directly to the pcm through terminals l and f at the generator. Pcm operation two different control modules are used. The device regulates the output of an automotive generator by controlling the field winding current.
Alternator voltage regulator with load response control. The generator regulates the field using pin1 of the field connector high side driver. This lead controls power to the generator field, fuel injectors, and oxygen sensor heaters. How to test an alternator chrysler dodge jeep youtube.
Alternator field terminals both read full voltage when. Dodge dakota warning lights and trouble codes page 3 car. How to test an alternator testing the voltage regulator, diode rectifier and stator duration. The pcm monitors the continuity and voltage level of the. Jan 06, 2014 how to test an alternator testing the voltage regulator, diode rectifier and stator duration. P0622 code definition this code is defined as the generator field f control circuit malfunctioning. The second terminal is labeled b, sense or kelvin sense, and used by the pcm to monitor charging voltage. Apr 06, 2015 this is a computer controlled alternator. A battery temperature sensor bts, located in battery tray, is used to sense battery temperature. Jul 18, 2017 the generator field duty cycle signal circuit connects to high side of the field windings in the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. Obd code p0622refers to the pcm monitors generator load from the generator regulator in the form of frequency. Two different powertrain control module pcm 5volt supply circuits are used. Pin 10 on pcm connector c2 and pin 25 on pcm connector c3 form the source for the field winding.
As you can see they have had issues with the circutry from the generator to the pcm. Alternatorfield duty signal wirepcm problem gmtnation. The field voltage to charge the battery is set by the pcm. The pcm uses the pwm signal input to determine the generator load on the engine. Thats the ground signal from the pcm to operate the asd relay. Generator field driver circuit short to ground generator field driver circuit open generator field coil open generator field coil shorted pcm. Voltage regulator in pcm fried dodge ram forum dodge. The generator field duty cycle signal circuit connects to the high side of the field winding in the generator. The powertrain control module pcm uses a generator field duty cycle signal to monitor the duty cycle of the generator.
A circuit in the pcm cycles the ground side of the generator field at 250 times per second 250hz, but has the capability to ground the field control wire 100% of the time full field to achieve the target voltage. Hyundai p0620 generator control circuit malfunction car. The ecm in some manner controls the voltage regulator, which charges the battery. The generator is internally grounded and regulates the field using pin1 of the field connector high side driver. Operation the amount of dc current produced by the generator is controlled by evr. The pcm monitors the continuity and voltage level of the generator field control circuit whenever the engine is running. If voltage is 10 volts or less, repair open or high resistance in dark blue wire between generator and terminal no. The amount of amperage produced by the generator is controlled by electronic voltage regulator evr circuitry within the pcm.
Pin 86 light greenblack startrun feed from the ignition switch and fuse 9. When generator operation is desired, the pcm sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. Pulse code modulation generators for telemetry equipment pcm generator the pcm generator system used to generate different types of pcm format signals. The f simply reiterates the field coil control circuit is at fault. P1638 cadillac generator f terminal circuit conditions. Intrepid stalls when alternator connected dodgeintrepid. Generator load on the engine is calculated based on a pwm signal from the generator. When generator operation is desired, the pcm sends a 5 volt signal to the voltage regulator via. This circuit ties the ignition switch to the powertrain control module pcm. If the voltage differs by some amount this code is set. A stored code p0622 means that the powertrain control module pcm has detected a malfunction with the generator field coil control circuit. If you look at your alternator youll see the field coil windings inside the case through the cooling vents. P0622 alternator, field control circuit malfunction troublecodes. Jeep p0620 generator control circuit malfunction car obd.
The pcm also adjusts the generator charge rate through control of the generator field and provides speed control operation. The two technologies dis cussed allow for a bidirectional. Field duty middle plugpin51both the red and grey wires tested fine for continuity to the pinholes on cabling. Pin 10 is the generator field driver and pin 25 is the the generator field source on the autozone bench, the alternator is placed on a machine that simulates. Also, tested for shorts and could not find any on both grey and red wires. Apr 03, 2012 the field voltage to charge the battery is set by the pcm. The engine computer system referred to as an engine control module ecm, or powertrain control module pcm uses a variety of input sensors and switches for information. If the charging rate cannot be monitored limpin, a duty cycle of 25% is used by the pcm in order to have some generator. A pulse width modulated pwm high side driver in the voltage regulator turns the field winding on and off. P1638 buick generator f terminal circuit conditions.
Jan 20, 2016 pcm operation two different control modules are used. The powertrain control module pcm uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. Jan 06, 2015 decided to check shortscontinuity at pcm cabling. This causes the voltage regulator to begin controlling the generator field circuit. I will be walking you through the steps involved in making sure the wiring is correct.
If voltage is greater than 10 volts, go to next step. Generator field driver circuit shorted to ground daniel. Ecm not communicating with alternators voltage regulator. P0622 generator field f control circuit malfunction obd codes. Repair the open in the k20 generator field control circuit. Ms1607 pulse code modulation generators for telemetry. Calculates the optimum target throttle valve opening angle and controls the throttle valve actuator which allows the driver to drive the vehicle at will. On modern applications, the pcm uses a dedicated alternator field duty cycle. Using test light connected to ground, backprobe terminal no. This voltage is connected through the pcm and supplied to one of the generator field terminals gen. The pcm monitors the status of the generator field duty cycle signal.
How to bypass the generator battery control module. Based on inputs that it receives, the pcm adjusts ignition coil dwell. The field coil is probably most recognizable from its windings which are visible through the vent holes on most alternators. Charging system issue the chrysler minivan fan club forums.
Dodge dakota warning lights and trouble codes page 3. The field coil surrounds the generator armature and remains stationary in the alternator housing. Measure the generator field driver circuit from pcm to generator. Jun 23, 2011 generator field driver circuit shorted to ground daniel. What the p0622 code means when the pcm powertrain control module logs a. The powertrain control module pcm uses the generator turn on signal circuit to control the generator. Repair the open in the z1 gen field ground circuit.
The processor in the ecm uses the information to make decisions. Field driver, lamp driver and relay driver short protection complex diagnostics thermal shutdown at 175 c description the l9409 is a monolithic multifunction alternator voltage regulator intended for use in automotive applications. If it asd relay wasnt working it wouldnt even start. P0626 relates to generator fieldf terminal circuit high. I will be walking you through the steps involved in. Generator control idling stability has been improved by optimum control of generator voltage according to engine operation and electrical load conditions. A pulse widht modulated pwm high side driver in the voltage regulator turns the field warnings on and off.
If the exciter field winding is shorted or not functioning because. Function of generator field duty cycle signal on pcm fixya. A pulse widht modulated pwm high side driver in the voltage regulator turns the field windings on and off. This system is an independent unit with lcd and keypad for user interface. When driving, you might find that shifting is a challenge. Cam,crank,fuel injectors,ignition coil pack,alternator.
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