Section 9. Theory of Operation Toyota Orderpicker Model 7BPUE 15 Service Manual

Primary Memory

Primary Memory

c. If the test fails, the STM is not communicating and should be replaced.

The primary memory location of the truck's identification and options are stored in the Installing a card that has firmware installed for Carriage Manager (CM).A back UP COPY of this a different model truck can lead to an information is stored in the Steer Tractor inoperable truck. 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 an 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 shut 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 an inoperable truck do not install firmware or change an option with FlashWare until the truck is functional again.

2. When trying to install new firmware or change an 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, run 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.

Pinout Matrix

The pinout matrix chart lists functions and normal voltages of terminals and harness connector pins. The matrix columns have the following meanings:

1. Item #: sequential number to aid in reference.

2. Connection: the actual wire numbers or component abbreviations on the electrical schematic.

3. Function Description: brief definition of the signal carried on the wire.

4. Theory of Operation: a. A detailed description of the signal carried on the wire. If the signal can be variable, it indicates the state of a related component that will cause the signal to vary.

Pinout Matrix

b. Identifies possible causes for lack of proper signal.

5. Normal Level: the approximate voltage that should be seen on that wire for the state indicated. Unless otherwise indicated, voltages are measured with respect to (wrt) B- at TP4.

6. Signal Source: the device or connection that supplies the signal directly to the wire.

7. Signal User: the device or connection to which the wire directly delivers the signal.

head will not function and code 3,2 is displayed during self-diagnostics. Check voltage at (+12VF) on the STM.

Battery negative for the control circuitry on the steer power head. It comes from the STM.

Input from the STM to turn on the circuitry in one half of the steer transistor circuit for steering right.

Input from the STM to turn on the circuitry in one half of the steer transistor circuit for steering left.

Input from the STM to PWM the circuitry in one half of the steer transistor circuit for steering in the left.

Input from the STM to PWM the circuitry in one half of the steer transistor circuit for steering right.

<O.SVdc wrt TP4 (B-)

5V no steering OV steering right

5V no steering. OV steering left

OV not steering. 4.6V steering fast left

OV not steering.

4.6V steering fast right