Key Switch On - Toyota 7BPUE15 Service Manual

Section 9. Theory of Operation
)
Key Switch (S 1 O n
Key Switch
When the key switch is first turned on, the
microprocessor control system performs a
self-diagnostics of certain inputs and outputs.
The self-diagnostics lasts approximately 1
second. Sensor leads are checked for the
correct voltages during the self-diagnostics. If a
problem is detected, the steer/tractor manager
prevents truck operation and displays a fault
code on the operator display.
With the wire guidance option, the guidance
manager receives battery voltage a t JP2- 1 1 a s
Refer to the schematic in Figure 9-3 on
page 9- 12. (The electrical schematic legend is
on page 9-2.)
The following voltage points are measured with
respect to TP4 (B-):
1. Turning the key switch (S 1) on supplies
battery voltage from S 1-2 to JPC 1 1
KEY).
2. Battery voltage is a t the following points
on the carriage manager:
JPC 1 1-2 through S2 1 to JPC 1 1-3 (B+
ESTOP)
3. Battery voltage is a t the following points
on the steer/tractor manager:
power amplifier J 1
4. Battery voltage is a t the following points
on the steer/tractor manager a s B+
ESTOP:
solenoid coil to JPT12-9
solenoid coil to JPT12-8
Toyota Orderpicker Model 7BPUE 15 Service Manual
On
1 (B+
16
5. The steer/tractor manager receives battery
voltage and produces the following
voltages:
Boost for steer power head
+
6. 12 volts (1 2VP) is present a t the following
points on the steer/tractor manager:
+
7. 1 1.3 volts is supplied by the carriage
manager to the following points on the
carriage manager (this is generated from
+
12VP from the steer/tractor manager):
JPC3-6 (optional lower limit S60)
JPC 12-6 (optional sidegate switch 1,
JPC7-2 (Deadman 1 S2)
JPC7-5 (Deadman 2 S23)
JPC 12- 15 (optional sidegate switch 2,
S20)
JPC 1 1 (operator display)
8. +5 volts is present a t JPC2-3 (steer
encoder) on the carriage manager.
9. +5 volts is present a t PT6-3 steer feedback
encoder) on the steer/tractor manager.
With the wire guidance option, the guidance
manager receives:
1. Battery positive a t JPS2- 1 1 a s B+ESTOP.
This is also used by the power supply on
the guidance manager (GM) to generate
+12 volts which is used by the steer
00700-CL222-05, 1 5 March 2005