Chevrolet Equinox manuals

Chevrolet Equinox Service Manual: Drive Range, Third Gear Default Automatic Transmission Unit

Chevrolet Equinox Service Manual / Powertrain / Transmission/Transaxle / Drive Range, Third Gear Default Automatic Transmission Unit

If the transmission is in 1st, 2nd or 3rd gear during a transmission electrical componentfailure, the transmission will default to 3rd-gear. All solenoids will default totheir normal state. If the torque converter clutch was applied, it will release. Thisdefault action will enable the vehicle to be safely driven to a service center.

1-2-3-4 Clutch Stays Applied

Shift Solenoid 2

Shift solenoid-2 defaults to it's normally-closed state (OFF), and SOL-2 fluid exhauststhrough the solenoid.

Clutch Select Valve 3

Solenoid-2 fluid pressure no longer holds the clutch select valve-3 open. When thevalve moves back to the closed position, it opens the 1234-clutch default fluid circuit,and 1234-default fluid is routed to the 1-2-3-4-clutch regulator valve.

1-2-3-4 Clutch Regulator Valve

With the absence of PCS-1234 clutch fluid, due to the default state of the 1234-pressurecontrol solenoid-5, the 1-2-3-4-regulator valve would close from spring force. However,the 1234-clutch default fluid enters behind the 1-2-3-4-regulator shuttle valve andkeeps the valve in the open position.

1-2-3-4 Clutch

With the 1-2-3-4-clutch regulator valve still held in the open position, the 1-2-3-4-clutchwill stay applied.

3-5 Reverse Clutch Applied or Applies

35R Pressure Control Solenoid 2

The normal state for the 35R-pressure control solenoid-2 is ON, therefore PSC-35 reverseclutch fluid will still be routed to the 3-5-reverse clutch regulator valve and the3-5-reverse clutch boost valve.

3-5 Reverse Clutch Regulator Valve

PCS-3-5 reverse clutch fluid moves the 3-5-reverse clutch regulator valve against3-5-reverse clutch regulator valve spring force and 3-5-reverse clutch feedback fluid.This allows 3-5-reverse feed to pass through the valve and enter the 3-5-reverse clutchcircuit. 3-5-reverse clutch fluid is then routed to the 3-5-reverse clutch, the 3-5-reverseboost valve and the clutchselect valve-2. When the 3-5-reverse clutch regulator valve is in this position, PS2-fluidfrom the pressure switch-2 exhausts through the valve, allowing the switch to close.

3-5 Reverse Clutch Boost Valve

PCS-3-5 reverse clutch fluid pressure acts on a differential area moving the 3-5-reverseclutch boost valve against the 3-5-reverse clutch boost valve spring. The 3-5-reverseclutch fluid passes through the valve and enters the 3-5-reverse clutch feedback circuit.As PCS-3-5 reverse clutch fluid pressure is increased to a given value, the 3-5-reverseclutch boost valve opens the 3-5-reverseclutch feedback circuit to exhaust. This results in the 3-5-reverse clutch regulatorvalve moving to the full feed position sending full 3-5-reverse clutch feed pressure(full line pressure) to the clutch.

3-5 Reverse Clutch

The 3-5-reverse clutch fluid enters the 3-5-reverse/456 clutch housing to move thepiston against spring force to apply the 3-5-reverse clutch plates.

Drive Range, Third Gear Default

Drive Range, Third Gear Default Automatic Transmission Unit

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Drive Range - Fourth Gear Default (Gen 2/Hybrid) Automatic Transmission Unit
If the transmission encounters an electrical componentmalfunction, the transmission will default to Fourth gear. Allsolenoids will default to their normal state. If the torqueconverter clutch is appli ...

Drive Range, Fifth Gear Default Automatic Transmission Unit
If the transmission is in 4th, 5th or 6th gear during a transmission electrical componentfailure, the transmission will default to 5th gear. All solenoids will default totheir normal state. If the tor ...

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