Mike's Workshop Manuals: Service manuals for every vehicle
Home >> GMC >> 2012 >> Yukon Hybrid, RWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Control System >> Diagnostic Information and Procedures >> Engine Does Not AutoStop >> Circuit/System Verification

Circuit/System Verification

  1. Hood closed, start the engine with the ignition key and allow to idle.
  2. Monitor engine operation and the tachometer display for 5 minutes.
  3. The vehicle should enter the Autostop hybrid mode.
    • If the vehicle operates in the Autostop hybrid mode, the system is operating normally.
    • If the vehicle cycles rapidly in and out of the Autostop hybrid mode, test the auxiliary transmission fluid pump pressure. Refer to Line Pressure Check .
    • If the vehicle does not operate in the Autostop hybrid mode, continue to Circuit/System Testing.
scientia non olet · About Mike's Workshop Manuals