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Safety and Durability


In our opinion, it is equally important for a transmission controller to protect your investment as it is to shift consistently. We provide every possible tool to mitigate the effects of faults and failures and keep your transmission healthy. Overheating and low line pressure are the two quickest ways to destroy a perfectly good transmission. The Revolution Architecture provides comprehensive tools to warn you of high temperatures and critical faults.
We continuously monitor for transmission slippage, as available sensors permit, and constantly check various sensors for fault conditions. When a potentially damaging fault is detected, the controller commands fail-safe (default) line pressure in order to protect the transmission. We also have several intelligent algorithms that boost line pressure in critical situations to pro-actively prevent slip and protect the friction materials from potential damage.


Overheat alarm mode with adjustable temperature *

The Quick 4 will display a “HOT” warning message if the transmission fluid temperature rises above a user-selected limit.


Intelligent line pressure control *

The Revolution Architecture includes many algorithms to control line pressure appropriately for different situations. Line pressure is controlled dynamically during each shift so shift quality can be optimized in all gears.
Under static conditions (when a shift is not in progress), line pressure is automatically boosted at times when the transmission is more likely to slip due to increased torque. These conditions include when the torque converter is likely to be multiplying torque and during throttle tip-in. Feed-forward algorithms serve to protect the transmission under these transient conditions while allowing line pressure to be safely run at a slightly lower level during cruise conditions. A lower cruising line pressure will slightly improve fuel economy, but more importantly, will allow the transmission to run cooler. The default pressure curves are very conservative and will insure transmission durability.


Adjustable line pressure coasting boost algorithm *

Coasting pressure boost is yet another transmission protection feature built into the Revolution firmware architecture. During times when significant engine braking is occurring (seen as reverse torque through the transmission), the controller can boost the line pressure to insure that the transmission does not slip. This feature is especially helpful for applications with low axle ratios or where manual ranges are used extensively for engine braking. Higher levels of coasting boost pressure can be used for diesel exhaust brake applications.


Check-sum for calibration table data

The controller continually monitors the contents of calibration tables that are in use and provides a check-sum error message to indicate that data in a particular table is potentially corrupt.


Fail-safe line pressure when error conditions are detected

If certain faults are detected, the Quick 4 will default to a safe maximum line pressure setting to prevent transmission damage until further diagnostics can be completed. Several faults can cause fail-safe line pressure to engage, including:

  • Throttle position sensor fault **
  • Over-current error in pressure control solenoid circuit **
  • Excessively High or Low Battery Voltage
  • Calibration check-sum error
  • Transmission Slip Detection *

When transmission slip is detected, fail-safe pressure will be commanded in the current gear until a shift occurs. If transmission slip is detected more than twice in a drive cycle, then fail-safe pressure will be latched for the remainder of that drive cycle.


Manual 1st upshift capability **

If you choose, the Quick 4 is capable of allowing a 1-2 upshift even while the gear selector is in manual 1st. This prevents accidental over-revving of the engine.


( * Feature that is exclusive to US Shift products )

( ** Existing feature from Quick 1 )