Code P110 Alternator Terminal "L" Circuit Problem: Notes

This diagnostic monitors alternator feedback and compares it to alternator control in the PCM. Code P110 will set when the PCM commands the alternator on and the feedback indicates that alternator is off for 15 seconds.

PCM supplies 12 volts to alternator terminal "L" and initiates alternator operation. The alternator regulator applies voltage to the rotor as a Pulse Width Modulated (PWM) signal to energize field windings.

Alternator can detect internal faults and PCM will set Code P110 if fault occurs for 15 seconds. Alternator can self-diagnose a shorted output diode, malfunctioning regulator, an open or shorted rotor, an over or under voltage condition, shaft not rotating, or open sense lead. BATTERY NO CHARGE message is displayed on DIC.

1. Checks PCM's ability to cycle alternator control output. If voltage cycles, replace battery.
2. Checks if circuit No. 225 (Red wire) is open or shorted to ground, or for faulty PCM.