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Automatic Transmission - 2ML70 - Specifications: Other Chevrolet Tahoe III

Shift Solenoid Valve State and Gear Ratio

GearShift SOL 1Shift SOL 2Aux Line BOOST Valve PC SOL 5 N.L.1-3 CL PC SOL 4 N.L.Hybrid Low, 1-2 CL PC SOL 3 N.H.Hybrid Direct, 2-3-4 CL PC SOL 2 N.H.Isolator Valve PC SOL 1 N.H.Gear Ratio
Park (Engine Running)OFFOFFOFFOFFOFFOFFON
Reverse (EVT Engine Running)OFFOFFOFFOFFONOFFON3.692
Neutral (Engine RunningOFFOFFOFFOFFOFFOFFON
EVT Mode 1 (Engine Running)OFFOFFOFFOFFONOFFONInfinity to 1.70
EVT Mode 1 (Engine Off)OFFOFFONOFFONOFFOFFInfinity to 1.70
Drive 1stONOFFOFFONONOFFON3.692
Drive 2ndONOFFOFFOFFONONON1.705
Drive 3rdONONOFFONOFFONON1.000
Drive 4thONONOFFOFFONONON0.738
EVT Mode 2 (From 4th)OFFONOFFOFFOFFONON
Power Off Low DefaultOFFOFFOFFOFFONONON
Power Off High DefaultOFFOFFOFFOFFONONON
For shift solenoids 1 and 2, "ON" = Solenoid Energized (Pressurized) "OFF" = Solenoid De-energized (No Pressure). For pressure control solenoids, "ON" = Pressurized, "OFF" = No Pressure

Transmission Internal Mode Switch Logic

IMS Circuits/ParameterSelector Position
ParkReverseNeutralDriveManual
Direction Switch Operating Conditions: Ignition ON, range selector in appropriate gear
Direction IMS D1HIGHHIGHLOWLOWLOW
Direction IMS D2LOWLOWHIGHHIGHHIGH
Direction IMS R1HIGHLOWLOWHIGHHIGH
Direction IMS R2LOWHIGHHIGHLOWLOW
Direction IMS StartLOWHIGHLOWHIGHHIGH
Range Switch Operating Conditions: Ignition ON, range selector in appropriate gear
IMS ALOWLOWHIHIHI
IMS BHILOWLOWLOWHI
IMS CHIHIHILOWLOW
IMS PLOWHILOWHILOW
Always HIGH status: Open/short to voltage condition Always LOW status: Short to ground condition Every status HIGH for either switch indicates an open ground circuit or connector for that portion of the IMS.

Internal Mode Switch (IMS)