Scan Tool Data Definitions

WARNING: This page is about a different car, the 2007 Pontiac Montana SV6, 2007 Chevrolet Uplander, and 2007 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Battery Voltage Signal: The scan tool displays 0-20 Volts. The scan tool displays the voltage as received by the Module or the 72-08 battery voltage message from the body control module (BCM).
GEN F-Terminal Signal: The scan tool displays 0-100%. The scan tool displays 0-10% until the engine is started and the powertrain control module engine control module (ECM) receives a signal from the generator then 5-90% is displayed.
GEN L-Terminal Signal Command: The scan tool displays On/Off. The scan tool displays Off until the engine is running, then the engine control module (ECM) supplies then the percentage value varies depending on electrical loads.
GEN L-Terminal Signal Status: The scan tool displays OK/Incomplete/Short Gnd/Open/Short B+. The scan displays the status of the Generator L terminal 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 ECM.
Starter Relay Command: The scan tool displays ON/OFF. The scan tool displays Off until engine start has been requested, then it reads On.
Starter Relay Circuit History: The scan tool displays Fault/OK/Invalid State. The scan tool displays Fault until the starter relay circuit history is grounded then OK is displayed.
Starter Relay Circuit Status: The scan tool displays OK/Incomplete/Short Gnd/Open/Short B+. The scan displays the status of the starter relay control circuit.
PNP Switch: The scan tool displays, In Gear/Park/Neutral/. The scan tool displays the position of the transmission range switch.