Great Plains 3PYPA Predelivery Manual User Manual
Page 66
62
3PYPA
Great Plains Manufacturing, Inc.
401-647Q
2012-08-08
ECU does not
power up
(no lights on
switch box)
Fuse blown
Check fuse, located at + battery terminal. If blown, check
for underlying problem before using system:
1.
Set STEER switch off on console.
2.
Disconnect harness to ECU
(ECU has standby power, even with console off).
3.
Replace fuse.
4.
Switch on console - check fuse.
If OK, switch off console and continue.
5.
Connect ECU harness. Check fuse. If OK, continue.
6.
Switch on console and check fuse.
Power input disconnected or
damaged.
Check voltage at 70-pin ECU plug, with console on:
Pins 1 and 2, then Pins 2 and 3
Low battery voltage
Check tractor voltage. Must be between 10 and 16Vdc.
Steering
doesn’t match
tractor
Calibration needed
Perform a steering calibration (page 59). If calibration does
not solve the problem, check for damaged sensor.
No caster
float in
transport
No radar signal (seen by ECU as
0 mph)
Check radar Y-cable connection and radar function
Disengage speed not set to proper
value in ECU setup
Contact Great Plains support. If the ECU firmware was
recently updated, there may be other incorrect settings.
Steering
reversed
Sensor installed on incorrect tractor
side or incorrect location on axle
Re-install sensor at location specified in Pre-Delivery
manual 401-647Q.
ST1 and ST2 connections reversed
at manifold valve
Check entire hydraulic system against diagrams in Parts
manual. Correct connections as necessary. If the
mis-connection was not the result of local maintenance,
report problem to dealer or Great Plains.
Hoses to steering cylinders reversed
at left cylinder
Check entire hydraulic system against diagrams in Parts
manual. Correct connections as necessary. If the
mis-connection was not the result of local maintenance,
report problem to dealer or Great Plains.
Harness connections reversed at
valve coils
Swap connections at ST1 and ST2. If the mis-connection
was not the result of local maintenance, report problem to
dealer or Great Plains.
Steering Troubleshooting (other than flash error codes)
Problem
Cause
Solution