Scan Tool Data Definitions

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) over class 2 lines.
Crank Request Signal: The scan tool displays Yes/No. The scan tool displays No until the ignition is placed into the START position then Yes is displayed.
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 PCM/engine control module (ECM) receives a signal from the generator then OK 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 powertrain control module (PCM)/engine control module (ECM) supplies then the percentage value varies depending on electrical loads.
Idle Boost Level: The scan tool displays the current engine idle boost level as commanded by the PCM/ECM.
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/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.
TR Sw.: The scan tool displays Park, Reverse, Neutral, Drive 4, Drive 3, Drive 2, Drive 1. The scan tool displays the position of the transmission range switch.