COMPUSHIFT II Manual – COMPUSHIFT II Manual
Monitoring & Tuning Your System
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Label
Meaning
PRB
Transmission hydraulic pressure as a percentage of maximum available pressure
(see PRB note below)
TACH 8000 MPH 100
GEAR A1 TCC ON
TEMP 185 BATT 12.1
TP 85 PRB 90
The "
PRB
" item represents the current shift pressure as a percentage of available hydraulic pressure. The internal
pressure regulator that's part of the hydraulic pump assembly sets the minimum and maximum available pressure
in the transmission. COMPUSHIFT II can set the pressure to be anywhere between the minimum and maximum set
by the pressure regulator. When COMPUSHIFT II commands minimum pressure, this is displayed as 0%; maximum
pressure is displayed as 100%. To see absolute hydraulic pressure, you must attach a pressure gauge to the test
port on the transmission.
Regarding
GEAR
:
If you use Switch-Shift controls (paddles or pushbuttons) to select your gear, the gear indicator is prefaced
by an "S" (example: GEAR S1).
When the automatic transmission is on control of shifting, the gear indicator is prefaced by an "A", as shown
(example: GEAR A1).
In manual mode, the gear indicator is prefaced by an "M" (example: GEAR M1).
If you have a four-wheel-drive vehicle, and the transfer case is in "low," the display will show an "L" after the
gear indicator (example: GEAR 1L).
4.1.2 Large Digit Gear Screen
So you can view key readouts at a glance, the COMPUSHIFT II Display offers large-digit screens, including this one
that shows the current transmission gear.
G
█ █
E
A
R
█
The GEAR indicator may not read correctly until the engine is running. This is because some transmissions
(notably GM) use hydraulic pressure to sense gear-lever position. Without the engine running to generate
hydraulic pressure, the indicator can be incorrect. This is
not
a fault in your COMPUSHIFT II.
