Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions
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.
Electronics Battery FD: The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the battery positive voltage E circuit of the BCM.
GEN F-Terminal Signal: The scan tool displays 0%-100%. The scan tool displays 0%-100% until the engine is started and the PCM 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 PCM supplies then the percentage value varies depending on electrical loads
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.
Inadvertent Power Relay: The scan tool displays On/Off. The scan tool displays On when the key is in the ACCY. or ON position.
Load Management Relay: The scan tool displays On/Off. The scan tool displays On unless the BCM has entered Load Management or Idle Boost.
Load Shed: The scan tool displays None/Load 1/Load 2/Load 3. The scan tool displays None unless Load management has been entered.
Starter Enable Relay Circuit Status: The scan tool displays Fault/OK/Invalid State. The scan tool displays Fault until the ignition is placed into the START position then OK is displayed.
Starter Relay Command: The scan tool displays ON/OFF. The scan tool displays Off until the ignition is placed into the CRANK position, then it reads On.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.