Scan Tool Data Definitions
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
GEN L-Terminal Signal Command: The scan tool displays On/Off. The scan tool displays Off until the engine is running, then the PCM supplies a 5 volt signal to turn ON the generator.
Generator Lamp Circuit: The scan tool displays Fault/OK/Invalid State. The scan tool displays Fault until the ignition is placed into the ON position then OK is displayed.
Generator Lamp Command: The scan tool displays Yes/No. The scan tool displays Yes when the PCM grounds the charge indicator control circuit.
Ignition 1 Signal: The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the Ignition 1 circuit to the PCM.