New Holland CX720 Repair Manual page 2446

E0164-03-V Supply Ground Spd Hydro Shorted To High Source
(C.20.B.95.82 - G.30.B.54)
E0164-03 - V Supply Ground Spd Hydro Shorted To High Source
Cause:
The V Supply Ground Speed Hydro circuit is shorted to a higher than normal voltage source.
Possible failure modes:
1. Supply wiring shorted to greater than 18.0 volts.
2. Faulty alternator/regulator.
3. Controller internal failure (internal regulator failure).
Solution:
1. Start the combine. Engage the park brake, and shift the transmission into neutral (N). Enter the InfoView monitor
- "Diagnose info" screen.
Select "Driveline" sub menu.
Select "V Supply Ground Spd Hydro". Carefully move the multi-function handle (MFH) forward and reverse from
neutral and check voltage range.
The proper voltage supply is 10.0 - 18.0 volts with the multi-function handle (MFH) out of the neutral position.
A. If the voltage reading is high out of range 18 volts or more continue with Step 2.
B. If the voltage reading is within the proper limits the shorted wire may not be powered up at this time.
Continue the troubleshooting at step 5.
2. Shut off the combine engine, and then turn the key switch on again. Enter the InfoView monitor - "Diagnose
info" screen.
Select "CCM2" sub menu.
Select "V Supply Ground Spd Hydro". Carefully move the multi-function handle (MFH) forward and reverse from
neutral and check voltage range.
The proper voltage supply is 10.0 - 18.0 volts with the multi-function handle (MFH) out of the neutral position.
A. If the voltage reading is between 10 - 18 volts, the alternator and/or regulator has failed, and is producing
excessive voltage. Refer to Alternator - Testing (A.30.A.82 - G.40.A.20) for additional alternator testing
information.
B. If the voltage is greater than 18 volts, continue with Step 3.
3. Key switch in the "Off" position. Check the voltage at fuse F-42 using a multi-meter.
A. If the voltage reading is greater than 18 volts , then the batteries have been mistakenly connected in
series (7.5L units) , or there is a fault in the wiring of the 24 V starting system (Iveco units). Refer to
DISTRIBUTION SYSTEMS - Troubleshooting (A.80.A.90 - G.40.A.10) for additional information.
B. If the voltage reading is between 10 - 18 volts, continue with Step 4.
4. Key switch in the "On" position. Position the multi-function handle (MFH) out of neutral. Remove the buddy seat
and storage bin to gain access to connector X015 on CCM2. Check the voltage at connector X015 pin J1-17.
A. If the voltage reading is greater than 18 volts, then a high voltage source has been connected to one of
the following wires:
Wire 108 orange, fuse F-48 to connector X001, pin 3
Switch power wires from splice blocks B, W02 or F, W06 in the RH console
Wire 113 yellow, neutral switch S-22 to CCM2, pin J1-17
B. If the voltage reading is 10 - 18 volts, and the diagnostic screen is still indicating voltage in excess of
18 volts, there is an internal fault in CCM2. Reload the software for CCM2. If that does not correct the
concern, replace the module.
POWER TRAIN - TRANSMISSION Mechanical
2 4/7/2006
C.20.B / 108