Shift Solenoid Valve State and Gear Ratio
WARNING: This page is about a different car, the 2021 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
| Range | Park | Reverse | Neutral | Drive | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | ||||
| 1 - 2 - 3 - 4 - 5 - 6 Shift Solenoid Valve A Q77A Transmission Control Solenoid Valve 1 |
Off | Off | Off | Off | Off | Off | Off | Off | Off | On | On | On |
| 2 - 9 Shift Solenoid Valve B Q77B Transmission Control Solenoid Valve 2 |
Off | Off | Off | Off | On | Off | Off | Off | Off | Off | Off | On |
| 3 - 8 Shift Solenoid Valve C Q77C Transmission Control Solenoid Valve 3 |
Off | Off | Off | Off | Off | On | Off | Off | Off | Off | On | Off |
| 4TH Shift Solenoid Valve D Q77D Transmission Control Solenoid Valve 4 |
Off | Off | Off | Off | Off | Off | On | Off | Off | Off | Off | Off |
| 5 - 7 Rev Shift Solenoid Valve E Q77E Transmission Control Solenoid Valve 5 |
Off | On | Off | Off | Off | Off | Off | On | Off | On | Off | Off |
| 1-Reverse and 6-7-8-9 Shift Solenoid Valve F Q77F Transmission Control Solenoid Valve 6 |
On | Off | On | On | On | On | On | On | Off | Off | Off | Off |
| Clutch Select Solenoid J Q77J Transmission Control Solenoid Valve 9 |
On\Off | On | On\Off | Off | Off | Off | Off | Off | Off | Off | Off | Off |
| Fluid Level Control Solenoid K Q77K Transmission Control Solenoid Valve 10 |
On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off | On\Off |
| Gear Ratio | - | 2.96 | - | 4.689 | 3.306 | 3.012 | 2.446 | 1.923 | 1.446 | 1.000 | 0.747 | 0.617 |
|
NOTE:
For shift solenoids, "ON" = Solenoid Energized (Pressurized).For shift solenoids, "OFF" = Solenoid De-energized (No Pressure).For 1 - 2 - 3 - 4 - 5 - 6 clutch apply, the 1 - 2 - 3 - 4 - 5 - 6 Shift Solenoid Valve A is OFF (De-energized).For 6 - 7 - 8 - 9 clutch apply and reverse, the 1 Reverse and 6 - 7 - 8 - 9 Shift Solenoid Valve F is OFF (De-energized).The design for the Shift Solenoid Valve A, Valve B, and Valve F are a pintle design. This configuration allows the valves to operate as "Normally LOW" devices. "Normally LOW" devices meaning normally low pintle position will be present given no current command to the solenoid. (This translates to LOW force at the pintle.) This allows the transmission to have a default gear of 1st or 6th gear depending on the gear state of the transmission at the time of a TCM failure. Refer to the hydraulic circuits for more info. |
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