Primary Memory - Toyota 7BPUE15 Service Manual

Section 9. Theory of Operation

Primary Memory

Primary Memory
The primary memory location of the truck's
identification and options are stored in the
information is stored in the Steer Tractor
Manager (STM). Every time the truck is started
a comparison is performed between the two. If
they do not agree or one is "Blanked" the
hierarchy is:
1. When a pre programmed CM is installed in
a truck, the information programmed into
the card is downloaded to the STM when
the key is first turned on.
2. If a CM with the primary memory
"Blanked" is installed in the truck, the
information stored in the back-up memory
location on the STM is uploaded to the
CM.
These rules are always true except when
FlashWare has been connected to the STM and
software has been loaded or a n option has been
changed. When this has been done, there is a
bit in the STM that is activated and the STM
now becomes the primary memory location.
When the FlashWare program is s h u t down, the
bit in the STM is turned off and the information
is uploaded to the CM. The CM again has the
primary memory status.
1. A pre programmed CM is not required
unless one of the following codes is the
cause for replacement: 4,6, 5,4 or 5,5.
When troubleshooting a n inoperable truck do
not install firmware or change a n option with
FlashWare until the truck is functional again.
2. When trying to install new firmware or
change a n option and the attempt fails:
a. Run the test portion of the program. If
communication is found to be working
between the PC and the CM, they are
functioning correctly.
b. If there is no communication, r u n a
diagnostic test for a component on the
tractor side of the truck. If the test
passes, the STM is communicating and
the CM should be replaced.
Toyota Orderpicker Model 7BPUE 15 Service Manual
c. If the test fails, the STM is not
communicating and should be
replaced.
Installing a card that has firmware installed for
a different model truck can lead to a n
inoperable truck.
00700-CL222-05, 1 5 March 2005