Service manual

ATX 300 Plus Boost Operation Manual | Version 1 | September 2011 Robert Bosch LLC
16 | Calibration
ATX 300 PLUS BOOST Calibration
The ATX 300 PLUS BOOST is a high-tech, electronically controlled machine for exchanging transmission fluid.
The ATX 300 PLUS BOOST is connected in series with the transmission fluid flow at the cooler hose. The vehicle
transmission pump, aided by the units’ boost pump, then pumps used fluid into the ATX 300 PLUS BOOST used
fluid tank and the ATX 300 PLUS BOOST pumps new fluid to the transmission from the new fluid tank in the ATX
300 PLUS BOOST. Transmission pumps vary in their flow rate from vehicle manufacturer to manufacturer. This
requires that the ATX 300 PLUS BOOST monitor the old fluid coming from the transmission and then pump new
fluid back to the transmission at the same rate.
The used and new fluid tanks in the ATX 300 PLUS BOOST each sit on a weight scale (load cell). The increasing
weight of used fluid is monitored by the electronic controller which in turn controls the speed of the ATX 300
PLUS BOOST pump which is pumping new fluid to the transmission.
The function of the ATX 300 PLUS BOOST is to pump new fluid into the transmission as the transmission, aided by
the ATX 300 boost pump, pumps out used fluid at a rate that will keep the transmission fluid level consistent. Not
too much and not too little. This occurs with the design of the ATX 300 PLUS BOOST in a near-perfect world. So,
what is the real world?
Real world conditions must be considered:
1. Not all new transmission fluids weigh exactly the same. They are very close.
2. Old transmission fluids can have different weights. Very old fluid can have a lot of solids suspended in the
fluid and be very heavy.
3. Not all transmissions pump or control the flow of fluid in the same way. Some are very slow. Others cycle
the flow of fluid off and on to the cooling lines dependent on the temperature of the fluid. Both of these
examples might make the technician think the ATX 300 PLUS BOOST is not operating correctly because it
takes so long to do the exchange. The procedure can be speeded up by accelerating the engine to 2000 RPM
during the exchange.
These real world inconsistencies are expected and therefore the add or remove ½ quart feature was built into the
ATX 300 PLUS BOOST.
Slots are provided on the sides of the ATX 300 PLUS BOOST so that the technician can see the fluid levels in the
tanks. The scales next to the slots approximately indicate the number of quarts in the tanks. The only purpose of
these slots is to give the technician an idea of when the used fluid tank might need to be emptied or how many
bottles of new fluid to bring from the supply room to fill the new fluid tank.
Calibration of BOTH load cells is required when:
1. REMOVE USED FLUID flashes and three beeps are heard when trying to select amount of fluid to be
exchanged. The level of fluid in the used fluid tank is observed to be such that the tank is not full or would not
fill to capacity during an exchange procedure. For example, 8 QUARTS is pressed and there is obviously room
in the used fluid tank to accept 10 or more quarts.
2. ADD NEW FLUID flashes and three beeps are heard when trying to select amount of fluid to be exchanged.
For example, 8 QUARTS is pressed and more than 10 quarts of fluid can be seen in the new fluid tank.
3. REMOVE USED FLUID flashes continuously.
4. ADD NEW FLUID flashes continuously.
5. The control board is replaced for any reason.