Great Plains 3PYP Predelivery Manual - Manual (Page 63)

Appendix 59
07/19/2011 401-312Q
Steering Troubleshooting
Steering Error Flash Codes
Failure and errors detected by the self-diagnostics in the
steering ECU are presented to the operator as a series
of flashes of the Power LED.
There are 2 to 12 flashes, interrupted by a short pause.
Multiple errors are flashed in rotation, with a long pause
between each error code. A maximum of five error states
are reported in any single rotation.
Any of these errors causes the ECU to default the
hydraulic steering to “float”.
Machine Damage Risk:
Do not back up if ANY of these errors occurs.
Steering is disabled.
The wheels cannot fully caster and machine damage will
result. If the problem cannot be corrected in the field, drive
forward to remove the planter from the field.
Null4-AAC:
Code Diagnostic Corrective Action
1 - 1 Float valve HS short to battery
1 - 1 Float valve LS short to battery
1 - 2 Float valve HS short to ground
1 - 2 Float valve LS short to ground
1 - 3 Float valve open circuit
2 - 1 ST1 valve HS short to battery
2 - 1 ST1 valve LS short to battery
2 - 2 ST1 valve HS short to ground
2 - 2 ST1 valve LS short to ground
2 - 3 ST1 valve open circuit
3 - 1 ST2 valve HS short to battery
3 - 1 ST2 valve LS short to battery
3 - 2 ST2 valve HS short to ground
3 - 2 ST2 valve LS short to ground
3 - 3 ST2 valve open circuit
5 - 1 Tractor sensor short to ground
5 - 2 Tractor sensor open circuit ECU not detecting tractor sensor. Use same steps as for 5 - 1.
6 - 1 Caster sensor short to ground Check caster wheel sensor, using same steps as for 5 - 1.
6 - 1 Caster sensor open circuit ECU not detecting caster sensor. Use same steps as for 5 - 1.
8 - 1 ECU low voltage
29894
Check float valve coil and cable to ECU.
ECU is detecting an unexpected voltage in the circuit.
Check float valve coil and cable to ECU.
ECU is detecting a short to ground.
Check float valve coil and cable to ECU.
ECU is failing to detect presence of coil - no circuit continuity.
Check ST-1 valve coil and cable to ECU.
ECU is detecting an unexpected voltage in the circuit.
Check ST-1 valve coil and cable to ECU.
ECU is detecting a short to ground.
Check ST-1 valve coil and cable to ECU.
ECU is failing to detect presence of coil - no circuit continuity.
Check ST-2 valve coil and cable to ECU.
ECU is detecting an unexpected voltage in the circuit.
Check ST-2 valve coil and cable to ECU.
ECU is detecting a short to ground.
Check ST-2 valve coil and cable to ECU.
ECU is failing to detect presence of coil - no circuit continuity.
Check tractor wheel sensor for:
A. travel limits of sensor.
B. cable to ECU
C. function of sensor
Check tractor voltage above 10Vdc.
Check connections to ECU. Check harnesses and switchbox connections.