Code P110, Alternator "L" Terminal Circuit Problem: Notes

This test monitors alternator feedback and compares it to alternator control in PCM. When PCM commands alternator turned on and feedback indicates that it is off for 15 seconds, Code P110 will set. PCM initiates alternator operation by supplying 12 volts to alternator "L" terminal through circuit No. 225. Alternator regulator applies voltage to rotor as pulse signal to energize the field windings. Alternator can detect internal faults, setting Code P110. It can also self-diagnose a shorted output diode, malfunctioning regulator, open or shorted rotor, over or under voltage condition, shaft not rotating or open sense lead.