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Vidalia ,Louisiana |
ASIST
Concern Details
Your Reference Number is: KM1118978
Logged Date 9-Sep-2010
Base Model 2366 Combine
Concern Description
fault code Hb0
Symptom
Error code HBO displays
Resolution
Troubleshooting error code HBO
The Hb0 error code indicates that the header controller has detected that all solenoid circuits are open, shorted to ground, a failure has occurred in the coil circuit, or relay contacts have failed open.
In Pre-1999 machines this can be caused by a blown fuse 16. On 1999 machines and later, check fuse 18.
When the system is operating properly, the following result will be found at connector 21:
* Pin 11 has continuous 12 volts.
* Pin 15 has continuous 12 volts.
* Pin 16 has continuous 12 volts.
* Pin 7 has continuous 12 volts.
* Pin 3 has continuous 12 volts.
Follow these steps to troubleshoot error code Hb0
1. Install an adapter harness Part Number CAS 2112 at the header control module connector 21.
Turn the start key ON and check for voltage spikes at pins 3, 7, 11, 15, and 16.
Use a chassis ground for the volt meter. Approximately 2 seconds after turning the key on, you should see a momentary voltage spike.
* When there is no voltage on pin 3, replace the header control module.
* When there is no voltage on pin 7, but is voltage on pins 11, 15, 16, and 3, then check the wire between the enable relay terminal 5 and the header controller connector 21 pin 7.
* When there is no voltage on pin 11, 15, and 16, but there is voltage on pin 3 and 7, check the wire between the enable relay terminal 5 and the splice module 73 terminal "A". Check for voltage at connector 2 pin 4 also.
* When there is no voltage on pins 11, 15, 16, and 7, but is voltage on pin 3, go to step 2.
2. Remove the header enable relay and check for voltage at pin 3. There should be 12 volts.
* When there is voltage, go to step 3.
* When there is no voltage, replace the fuse and recheck. Fuse numbers may be different between model years.
3. With the start key in the OFF position, connect a voltmeter to pin 2 of the header enable relay and chassis ground, and turn the start key ON. Approximately 2 seconds after turning the key ON, you should see a momentary voltage spike.
* When there is a voltage spike, go to step 4.
* When there is no voltage spike, install an adapter harness CAS2112 at connector 21 pin 3, and recheck for voltage coming from header controller.
* When there is voltage, check the harness between the relay terminal 2 and connector 21 pin 3.
* When there is no voltage, replace the header control module.
4. Will the unloading auger swing? Use an ohm meter to check the header enable relay ground from terminal 1 to chassis ground. The resistance should be less than 2.0 ohms.
* This will check the ground service for the enable relay.
* When the resistance is low, go to step 5.
* When the resistance is high, check the wire from terminal 1 to the unloader swing out relay.
5. Replace the enable relay and check operations before returning to service.
NOTE: There may be a possibility of a bad harness for at least 2 of the solenoids show here between the solenoids and splice module 73, possibly connector 56, but that is unlikely with this fault code.
WARRANTY: Standard warranty terms apply.
9-Sep-2010
Attachments
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 C72970_Hb0_Wiring.pdf (113KB - 228 downloads)
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2366 with Error message Hb0
