The ecm directly controls the generator field control circuit input to the generator. Ecm not communicating with alternators voltage regulator. Ms1607 pulse code modulation generators for telemetry. The powertrain control module pcm, and the engine control module ecm. Alternator field terminals both read full voltage when.
The generator 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. 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 windings on and off. I believe 12v is supplied to the powertrain control module pcm from two sources a relay and the ignition switch. P1638 buick generator f terminal circuit conditions. Pin 86 light greenblack startrun feed from the ignition switch and fuse 9. Voltage regulator in pcm fried dodge ram forum dodge.
Hyundai p0620 generator control circuit malfunction car. Generator load on the engine is calculated based on a pwm signal from the generator. This allow the pcm to adjust the idle speed to compensate for high electrical loads. A pulse widht modulated pwm high side driver in the voltage regulator turns the field warnings on and off. Alternator voltage regulator with load response control. Jul 18, 2017 the generator field duty cycle signal circuit connects to high side of the field windings in the generator. The user can configure the pcm format to be generated.
The computer controls outputs like the injectors, fans, solenoids, and relays to operate the various components. Jan 06, 2015 decided to check shortscontinuity at pcm cabling. How to test an alternator chrysler dodge jeep youtube. Cam,crank,fuel injectors,ignition coil pack,alternator.
The two technologies dis cussed allow for a bidirectional. Thats the ground signal from the pcm to operate the asd relay. The pcm monitors the continuity and voltage level of the. What the p0622 code means when the pcm powertrain control module logs a. As you can see they have had issues with the circutry from the generator to the pcm. The engine is a 2008 cadillac lc3 using an e67 pcm and the. Dodge dakota warning lights and trouble codes page 3. A high side driver within the pcm allows the pcm to turn the generator on and off.
Using an external ohmmeter, check for resistance in field driver circuit alternator harness terminal and cavity no. Field duty middle plugpin51both the red and grey wires tested fine for continuity to the pinholes on cabling. The generator is internally grounded and regulates the field using pin1 of the field connector high side driver. If it asd relay wasnt working it wouldnt even start.
P0622 code definition this code is defined as the generator field f control circuit malfunctioning. Jan 06, 2014 how to test an alternator testing the voltage regulator, diode rectifier and stator duration. The f simply reiterates the field coil control circuit is at fault. I will be walking you through the steps involved in. 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.
Intrepid stalls when alternator connected dodgeintrepid. The voltage regulator portion of the pcm switches the field current on and off at a frequency of about 400 times per second. Charging system issue the chrysler minivan fan club forums. Repair the open in the z1 gen field ground circuit. The pcm also adjusts the generator charge rate through control of the generator field and provides speed control operation.
Alternatorfield duty signal wirepcm problem gmtnation. If voltage is 10 volts or less, repair open or high resistance in dark blue wire between generator and terminal no. This causes the voltage regulator to begin controlling the generator field circuit. P0622 alternator, field control circuit malfunction troublecodes. The processor in the ecm uses the information to make decisions. If the exciter field winding is shorted or not functioning because. This voltage is connected through the pcm and supplied to one of the generator field terminals gen. The field voltage to charge the battery is set by the pcm. The ecm in some manner controls the voltage regulator, which charges the battery. P0626 relates to generator fieldf terminal circuit high. The pcm uses the pwm signal input to determine the generator load on the engine. If voltage is greater than 10 volts, go to next step. P0622 generator field f control circuit malfunction.
Generator field driver circuit short to ground generator field driver circuit open generator field coil open generator field coil shorted pcm. 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. P0622 generator field f control circuit malfunction obd codes. Repair the open in the k20 generator field control circuit. Jan 20, 2016 pcm operation two different control modules are used. Jan 01, 2016 using scan tool, actuate generator field driver circuit. 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 pcm monitors the continuity and voltage level of the generator field control circuit whenever the engine is running. Pulse code modulation generators for telemetry equipment pcm generator the pcm generator system used to generate different types of pcm format signals. 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. Measure the generator field driver circuit from pcm to generator. Obd code p0622refers to the pcm monitors generator load from the generator regulator in the form of frequency. Using test light connected to ground, backprobe terminal no. Pcm operation two different control modules are used.
Apr 03, 2012 the field voltage to charge the battery is set by the pcm. Based on inputs that it receives, the pcm adjusts ignition coil dwell. Apr 06, 2015 this is a computer controlled alternator. Two different powertrain control module pcm 5volt supply circuits are used. How to bypass the generator battery control module. This circuit ties the ignition switch to the powertrain control module pcm.
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. Gen iii pcms have the ability to control generator load on the engine through a turnon signal output. Function of generator field duty cycle signal on pcm fixya. Calculates the optimum target throttle valve opening angle and controls the throttle valve actuator which allows the driver to drive the vehicle at will. Measure the voltage on the k20 gen field control circuit in the generator field harness connector.
The powertrain control module pcm uses the generator turn on signal circuit to control the generator. How to test an alternator testing the voltage regulator, diode rectifier and stator duration. The amount of amperage produced by the generator is controlled by electronic voltage regulator evr circuitry within the pcm. The device regulates the output of an automotive generator by controlling the field winding current. If you look at your alternator youll see the field coil windings inside the case through the cooling vents.
Intelligent charging for the vehicle electrical system. This lead controls power to the generator field, fuel injectors, and oxygen sensor heaters. When generator operation is desired, the pcm sends a 5 volt signal to the voltage regulator via. P1638 cadillac generator f terminal circuit conditions. If the voltage differs by some amount this code is set. 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. Disconnect the generator field harness connector at back of the generator. Pin 10 on pcm connector c2 and pin 25 on pcm connector c3 form the source for the field winding. The powertrain control module pcm uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. The pcm monitors the status of the generator field duty cycle signal.
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. The pcm controls the ground side of the alternator rotor field circuit. On modern applications, the pcm uses a dedicated alternator field duty cycle. The field coil is probably most recognizable from its windings which are visible through the vent holes on most alternators. The powertrain control module pcm uses a generator field duty cycle signal to monitor the duty cycle of the generator. This transistor grounds the ac generators field to control output voltage. I will be walking you through the steps involved in making sure the wiring is correct. Dodge dakota warning lights and trouble codes page 3 car. When generator operation is desired, the pcm sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. If the charging rate cannot be monitored limpin, a duty cycle of 25% is used by the pcm in order to have some generator. When driving, you might find that shifting is a challenge. P0622 generator field not switching properly obdii error.
Jun 23, 2011 generator field driver circuit shorted to ground daniel. The voltage regulator portion of the pcm switches the field current on and off at a. This system is an independent unit with lcd and keypad for user interface. 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. A battery temperature sensor bts, located in battery tray, is used to sense battery temperature. Also, tested for shorts and could not find any on both grey and red wires. The field coil surrounds the generator armature and remains stationary in the alternator housing. Generator field driver circuit shorted to ground daniel.
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