Scan Tool Data Definitions

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Battery Voltage: The scan tool displays 0-17.5 volts. The scan tool displays the voltage as received by the BCM.
GEN F-Terminal Signal: The scan tool displays 0-100%. The scan tool displays a steady percentage value until the engine is running, then the percentage value varies depending on electrical loads
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 about 5 volts to the L - Terminal of the generator and the scan tool displays On.
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.
TR Sw.: The scan tool displays Park/Reverse/Neutral/Drive4/Drive3/Drive2/Drive1. The scan tool displays the current physical gear of the Trans Range switch.
Volt Lamp: The scan tool displays On/Off. The scan tool displays On when the IPC has been commanded by another module to command the Volt Lamp On.