Section 9. Theory of Operation
Toyota Orderpicker Model 7BPUE 15 Service Manual
Primary Memory
Primary Memory The primary memory location of the truck's identification and options are stored in the Carriage Manager (CM).A back UP COPY of this 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:
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.
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.
00700-CL222-05, 1 5 March 2005
