E0038-03-Ccm1 8V Ref Voltage Shorted To High Source (A.50.A.91.81 - G.30.B.54) - New Holland CX720 Repair Manual

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E0038-03-CCM1 8V Ref Voltage Shorted To High Source
(A.50.A.91.81 - G.30.B.54)
E0038-03 - CCM1 8V Ref Voltage Shorted To High Source
Cause:
The CCM1 8V Ref Voltage circuit is shorted to a higher than normal source.
Possible failure modes:
1.
12 V short on 8 V regulated power circuit.
2.
Controller internal failure (internal regulator failure).
Solution:
1.
The 8 V regulated power supply is provided from the key switch power to the module, and is used to provide
power to all the speed and position sensor circuits. In some cases, a 12 V short on one of the sensor signal
wires could result in backfeeding that upsets the 8 V regulator, and may cause the short to high source fault.
Enter InfoView monitor - "Diagnose info" screen.
Select "Supply" sub menu.
Select "CCM1 8V Ref Voltage" and check voltage range.
The proper voltage is 7.5 - 8.5 volts.
A.
If the reading is high out of range, continue with step 2.
B.
If the reading is within the proper range, reload the software in CCM1. Erase the Fault code and continue
operation. If the fault code persists, replace the module.
2.
Turn off the key switch, and disconnect the battery key to remove all power from the module. Carefully remove
connectors X019 and X020 from the bottom of CCM1 module. Reconnect the battery key and enter the InfoView
monitor - Dealer Diagnostics screen.
A.
Select "Supply" sub menu.
Select "CCM1 8V Ref Voltage" and check voltage range.
The proper voltage is 7.5 - 8.5 volts.
B.
If the voltage reading is normal, there is a short to high source on one of the sensor wires. Continue with
step 3.
C.
If the voltage reading is still high out of range then CCM1 has an internal failure. Replace the controller.
3.
Turn off the key switch, and disconnect the battery key to remove all power from the module. Carefully reconnect
connectors X019 and X020 from the bottom of CCM1 module. Reconnect the battery key and enter the InfoView
monitor - Service Info screen. Use the "Active Errors" screen to check for any errors for sensor circuits short to
high source on CCM1 module.
A.
If there are any sensor circuits on CCM1 that are shorted to high source, correct those circuits, and then
continue with step 1 of this troubleshooting to verify this concern is resolved.
B.
If there are no sensor circuits errors on CCM1, reload the software in CCM1. Erase the fault code and
continue operation. If the fault code persists, replace the module.
DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
A.50.A / 84
2 4/7/2006

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