GM Gen V EcoTec3

Short-term correction the ECU makes to the injector pulse width to maintain stoichiometric AFR.

Learned long-term correction stored in ECU memory. Reflects cumulative fueling bias.

Low-pressure fuel rail pressure (returnless system). GDI engines also have a high-pressure rail — log both.

Per-cylinder knock retard in degrees. ECU pulls timing when knock sensor detects detonation.

Active Fuel Management status. Shows whether the engine is running in V4 or V8 mode.

Coolant temperature as reported by the ECT sensor. ECU uses this for fuel and timing corrections.

Air mass entering the engine as measured by the MAF sensor. ECU uses this to calculate injector pulse width.

Temperature of air entering the intake manifold. ECU uses IAT to correct fuel delivery.

GM's Oil Life Monitor calculates remaining oil life based on engine load, temperature, and RPM cycles.

Transmission fluid temperature. Critical for diagnosing transmission overheating, especially with towing or performance use.