"Charging system Fault"
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Safety Car
Joined: Aug 2000
Posts: 4,537
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From: St. Joseph MO
Cruise-In III Veteran
Cruise-In IV Veteran
"Charging system Fault"
Today I installed a 220Amp altertnator (Single wire output) in my 2001 Coupe to remidy the old flashing light blues with the stereo. However, I now get a Charging System Fault on the DIC display. What wire do I supply a switched 12 volt source to remidy this problem. Thanks Joe
Former Vendor
Joined: Apr 2001
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From: FL
St. Jude Donor '13
Re: "Charging system Fault" (JoeyG)
The PCM monitors the alternator through the red and grey wires :yesnod: If you eliminate them,you will have a problem...Read the description below:
The L-terminal circuit from the generator is a discrete circuit (a discrete circuit has no splices and only one source and destination) into the PCM. The PCM applies ignition voltage to the generator L-terminal circuit. A small amount of current flows from this circuit through the generator windings to ground to create a magnetic field which starts the generator process. When the generator is at operating speed and producing voltage, a solid state switch for the L-terminal circuit in the generator opens and the PCM detects that the initial startup current flow has stopped.
The PCM expects to detect low voltage on the L-terminal circuit prior to the generator rotating at operating speed and conversely expects the circuit to be at ignition voltage potential when the generator is operational. When the PCM detects a fault (circuit shorted to ground, or circuit shorted to voltage), the Driver Information Center will display Charging System Fault.
The generator has an input to the PCM called the F Terminal to indicate the percentage of total capacity that the generator is producing. This signal is detected by the PCM as a duty cycle from the generator and displayed on the scan tool as a percentage. The PCM can monitor the generators output under all conditions to determine if it is functioning normally.
When there is low demand from the electrical system on the generator, a low duty cycle percentage will be displayed. As more accessory load is placed on the generator, the duty cycle output detected by the PCM will approach 100 percent. A normally functioning generating system will never reach 100 percent as indicated on the scan tool.
The L and F terminals are the red and grey
[Modified by C-5 TECH, 10:11 PM 1/6/2002] :yesnod:
[Modified by C-5 TECH, 10:13 PM 1/6/2002]
The L-terminal circuit from the generator is a discrete circuit (a discrete circuit has no splices and only one source and destination) into the PCM. The PCM applies ignition voltage to the generator L-terminal circuit. A small amount of current flows from this circuit through the generator windings to ground to create a magnetic field which starts the generator process. When the generator is at operating speed and producing voltage, a solid state switch for the L-terminal circuit in the generator opens and the PCM detects that the initial startup current flow has stopped.
The PCM expects to detect low voltage on the L-terminal circuit prior to the generator rotating at operating speed and conversely expects the circuit to be at ignition voltage potential when the generator is operational. When the PCM detects a fault (circuit shorted to ground, or circuit shorted to voltage), the Driver Information Center will display Charging System Fault.
The generator has an input to the PCM called the F Terminal to indicate the percentage of total capacity that the generator is producing. This signal is detected by the PCM as a duty cycle from the generator and displayed on the scan tool as a percentage. The PCM can monitor the generators output under all conditions to determine if it is functioning normally.
When there is low demand from the electrical system on the generator, a low duty cycle percentage will be displayed. As more accessory load is placed on the generator, the duty cycle output detected by the PCM will approach 100 percent. A normally functioning generating system will never reach 100 percent as indicated on the scan tool.
The L and F terminals are the red and grey
[Modified by C-5 TECH, 10:11 PM 1/6/2002] :yesnod:
[Modified by C-5 TECH, 10:13 PM 1/6/2002]
